xx
ZZZ
TCPA300/400 Amplifiers &
TCP300/400 Series AC/DC Current Probes
Instruction Manual
*P071118304*
071-1183-04
xx
ZZZ
TCPA300/400 Amplifiers &
TCP300/400 Series AC/DC Current Probes
Instruction Manual
Revision A
This document applies for firmware version 1.0 and above.
Warning
The servicing instructions are for use by qualified personnel
only. To avoid personal injury, do not perform any servicing
unless you are qualified to do so. Refer to all safety summaries
prior to performing service.
www.tektronix.com
071-1183-04
Copyright © Tektronix. All rights reserved. Licensed software products are owned by Tektronix or its subsidiaries
or suppliers, and are protected by national copyright laws and international treaty provisions.
Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication
supersedes that in all previously published material. Specifications and price change privileges reserved.
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
Additional trademark statements can be added here.
Contacting Tektronix
Tektronix, Inc.
14200 SW Karl Braun Drive
P.O. Box 500
Beaverton, OR 97077
USA
For product information, sales, service, and technical support:
In North America, call 1-800-833-9200.
Worldwide, visit www.tektronix.com to find contacts in your area.
Warranty
Tektronix warrants that this product will be free from defects in materials and workmanship for a period of
one (1) year from the date of shipment. If any such product proves defective during this warranty period,
Tektronix, at its option, either will repair the defective product without charge for parts and labor, or will
provide a replacement in exchange for the defective product. Parts, modules and replacement products used
by Tektronix for warranty work may be new or reconditioned to like new performance. All replaced parts,
modules and products become the property of Tektronix.
In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the
expiration of the warranty period and make suitable arrangements for the performance of service. Customer
shall be responsible for packaging and shipping the defective product to the service center designated by
Tektronix, with shipping charges prepaid. Tektronix shall pay for the return of the product to Customer if
the shipment is to a location within the country in which the Tektronix service center is located. Customer
shall be responsible for paying all shipping charges, duties, taxes, and any other charges for products returned
to any other locations.
This warranty shall not apply to any defect, failure or damage caused by improper use or improper or
inadequate maintenance and care. Tektronix shall not be obligated to furnish service under this warranty a) to
repair damage resulting from attempts by personnel other than Tektronix representatives to install, repair or
service the product; b) to repair damage resulting from improper use or connection to incompatible equipment;
c) to repair any damage or malfunction caused by the use of non-Tektronix supplies; or d) to service a product
that has been modified or integrated with other products when the effect of such modification or integration
increases the time or difficulty of servicing the product.
THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THE PRODUCT IN LIEU OF ANY
OTHER WARRANTIES, EXPRESS OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY
IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
TEKTRONIX’ RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE
AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY.
TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL,
INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR
THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.
[W2 – 15AUG04]
Table of Contents
General Safety Summary .........................................................................................
Service Safety Summary.........................................................................................
Compliance Information .........................................................................................
EMC Compliance............................................................................................
Environmental Considerations ..............................................................................
Preface ............................................................................................................
Manual Conventions........................................................................................
ix
xii
xiii
xiii
xv
xvii
xvii
Getting Started
Getting Started .................................................................................................... 1-1
System Configuration ....................................................................................... 1-1
Options........................................................................................................ 1-2
Standard Accessories ........................................................................................ 1-3
Optional Accessories ........................................................................................ 1-4
Probe Covers ................................................................................................. 1-4
Travel Case ................................................................................................... 1-5
Connecting the Amplifier to an Oscilloscope............................................................. 1-6
Power on the Amplifier ..................................................................................... 1-7
Connecting a Current Probe to the Amplifier............................................................. 1-7
Operating the Current Probe Slide ......................................................................... 1-8
Degaussing and Autobalancing the Current Probe ....................................................... 1-9
DC Measurements ......................................................................................... 1-11
AC Measurements ......................................................................................... 1-12
Operating Basics
Control Summary.................................................................................................
TCPA300 and TCPA400 Controls .........................................................................
2-1
2-1
Reference
Reference Notes ..................................................................................................
Degaussing a Probe with an Unpowered Conductor in the Jaws .......................................
Measuring Differential Current ............................................................................
AC and DC Coupling........................................................................................
Maximum Current Limits...................................................................................
Measuring Noncontinuous Current with the TCP404XL Probe ........................................
Extending Current Range ...................................................................................
Increasing Sensitivity........................................................................................
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
3-1
3-1
3-1
3-3
3-4
3-5
3-7
3-8
i
Table of Contents
Application Notes ..............................................................................................
Automobile Charging Systems ...........................................................................
Inductance Measurements ................................................................................
Continuity Test of Multiple-Conductor Cable ..........................................................
Measuring Inductor Turns Count ........................................................................
Power Measurement and Analysis Software............................................................
Troubleshooting and Error Codes.............................................................................
Displaying Error Codes with the Probe Degauss Autobalance Button ..............................
Correcting the Cause of an Error Code..................................................................
Shutdown Error ............................................................................................
3-10
3-10
3-12
3-14
3-15
3-16
3-17
3-19
3-22
3-22
Specifications
Specifications ..................................................................................................... 4-1
Warranted Specifications.................................................................................... 4-1
Nominal and Typical Characteristics ...................................................................... 4-1
Mechanical Characteristics ................................................................................. 4-3
Environmental Characteristics ............................................................................. 4-5
Performance Graphs ......................................................................................... 4-6
TCP404XL Maximum Measurement Times............................................................ 4-10
Safety Compliance Information .......................................................................... 4-11
Performance Verification
Performance Verification Overview ............................................................................
Performance Verification and Functional Checks ........................................................
Test Procedure Conditions ..................................................................................
Equipment Preparation ......................................................................................
TCPA300 and TCPA400 Performance Verification...........................................................
Equipment Required.........................................................................................
Making DC Current Loops .................................................................................
Front-Panel Display .........................................................................................
DC Gain Accuracy...........................................................................................
Bandwidth ....................................................................................................
AC Coupling ...............................................................................................
Degauss .....................................................................................................
Current Overload Test (TCPA300 Only) ................................................................
TCPA300 Amplifier Test Record ........................................................................
TCPA400 Test Record.....................................................................................
TCP305 and TCP312 Performance Verification ............................................................
Required Test Equipment .................................................................................
DC Gain Accuracy.........................................................................................
ii
5-1
5-1
5-2
5-2
5-3
5-3
5-4
5-5
5-6
5-8
5-13
5-14
5-15
5-17
5-18
5-19
5-20
5-21
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Table of Contents
Rise Time ...................................................................................................
Bandwidth ..................................................................................................
TCP305 Current Probe Test Record .....................................................................
TCP312 Current Probe Test Record .....................................................................
TCP303 and TCP404XL Performance Verification.........................................................
Equipment Required.......................................................................................
DC Gain Accuracy.........................................................................................
Rise Time ...................................................................................................
Bandwidth (TCP303)......................................................................................
Bandwidth (TCP404XL)..................................................................................
TCP303 Current Probe Test Record .....................................................................
TCP404XL Current Probe Test Record .................................................................
5-25
5-27
5-30
5-31
5-32
5-33
5-34
5-37
5-40
5-42
5-43
5-44
Adjustment Procedures
Adjustment Procedures Overview .............................................................................. 6-1
TCPA300 and TCPA400 Amplifier Adjustments ............................................................. 6-2
Required Test Equipment ................................................................................... 6-2
Accessing the Adjustments ................................................................................. 6-2
TCPA300 Amplifier ......................................................................................... 6-3
TCPA400 Amplifier ......................................................................................... 6-4
TCP305 and TCP312 Adjustments ............................................................................. 6-5
Required Test Equipment ................................................................................... 6-5
Accessing the Adjustments ................................................................................. 6-5
TCP305 and TCP312 DC Gain Adjustment .............................................................. 6-6
TCP303 and TCP404XL Adjustments ......................................................................... 6-8
Required Test Equipment ................................................................................... 6-8
Adjustment Locations ....................................................................................... 6-9
TCP303 and TCP404XL Transient Response and Coarse Gain Adjustment ......................... 6-9
DC Gain Adjustment ...................................................................................... 6-15
Maintenance
Customer Maintenance...........................................................................................
Service Strategy..............................................................................................
Preventive Maintenance.....................................................................................
Disassembly .......................................................................................................
Amplifiers ....................................................................................................
Equipment Required.........................................................................................
Removing the Outer Case and Internal Covers ...........................................................
Replacing the Front Panel Assembly ......................................................................
Replacing the Amplifier Board .............................................................................
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
7-1
7-1
7-1
7-2
7-2
7-2
7-3
7-6
7-7
iii
Table of Contents
Replacing the Power Supply................................................................................
Replacing the Fan..........................................................................................
Probes .......................................................................................................
Equipment Required.......................................................................................
TCP305 and TCP312......................................................................................
TCP303 and TCP404XL ..................................................................................
Isolating Hardware Faults .....................................................................................
Determining the Amplifier Firmware Version Number................................................
7-9
7-10
7-12
7-12
7-13
7-17
7-20
7-21
Replaceable Parts
Replaceable Parts .................................................................................................
Parts Ordering Information .................................................................................
Using the Replaceable Parts List...........................................................................
Amplifier Replaceable Parts.....................................................................................
Current Probes Replaceable Parts...............................................................................
8-1
8-1
8-1
8-2
8-7
Glossary
Index
iv
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
List of Figures
Figure 1-1: Typical TCPA300/400 current measurement system ...........................................
Figure 1-2: Using the probe covers.............................................................................
Figure 1-3: Equipment locations in the travel case ...........................................................
Figure 1-4: Connecting and disconnecting a current probe to the amplifier ...............................
Figure 1-5: TCP312 and TCP305 slide operation ............................................................
Figure 1-6: TCP303 and TCP404XL slide operation.........................................................
Figure 1-7: Current probe polarity............................................................................
Figure 2-1: The TCPA300 front panel .........................................................................
Figure 3-1: Measuring differential current and nulls .........................................................
Figure 3-2: Effect of AC or DC coupling on low-frequency signals .......................................
Figure 3-3: Applying the amp-second product rule ..........................................................
Figure 3-4: Duty cycle calculation .............................................................................
Figure 3-5: Increasing the DC measurement range ...........................................................
Figure 3-6: Increasing probe sensitivity .......................................................................
Figure 3-7: Setup for measuring charging current ..........................................................
Figure 3-8: Charge current waveforms.......................................................................
Figure 3-9: Measuring inductance with a low-impedance source.........................................
Figure 3-10: Linear current vs. time ramp...................................................................
Figure 3-11: Measuring inductance with a high-impedance source ......................................
Figure 3-12: High-impedance source current ramp.........................................................
Figure 3-13: Measuring the number of turns in a coil......................................................
Figure 3-14: Turns measurement using reference coil .....................................................
Figure 3-15: Error code display...............................................................................
Figure 3-16: Interpreting the error code display ............................................................
Figure 4-1: Probe jaw dimensions (nominal)..................................................................
Figure 4-2: Frequency derating-TCP312 ......................................................................
Figure 4-3: Frequency derating-TCP305 ......................................................................
Figure 4-4: Frequency derating-TCP303 ......................................................................
Figure 4-5: Frequency derating-TCP404XL ..................................................................
Figure 4-6: Insertion impedance graphs for the current probes .............................................
Figure 4-7: Specified operating area of the probes ...........................................................
Figure 4-8: Measuring 750A noncontinuous at 50 °C ambient temperature.............................
Figure 4-9: Measuring 600A noncontinuous at 50 °C ambient temperature.............................
Figure 4-10: Measuring 750A noncontinuous at 23 °C ambient temperature ...........................
Figure 5-1: Check LED functionality ..........................................................................
Figure 5-2: Equipment setup for DC gain accuracy test .....................................................
Figure 5-3: Bandwidth test setup ...............................................................................
Figure 5-4: AC coupling test setup ...........................................................................
Figure 5-5: Setup for degaussing the current probe ........................................................
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
1-1
1-5
1-6
1-8
1-9
1-9
1-12
2-1
3-2
3-3
3-5
3-6
3-8
3-9
3-11
3-11
3-12
3-13
3-14
3-14
3-15
3-16
3-20
3-20
4-4
4-6
4-6
4-7
4-7
4-8
4-9
4-10
4-10
4-11
5-5
5-6
5-8
5-13
5-14
v
Table of Contents
Figure 5-6: Overload test setup ...............................................................................
Figure 5-7: DC gain accuracy test setup for TCP305 and TCP312 .......................................
Figure 5-8: Rise time test setup for the TCP305 and TCP312 ............................................
Figure 5-9: Bandwidth test setup for TCP305 and TCP312 ...............................................
Figure 5-10: DC gain accuracy test setup for the TCP303 and TCP404XL .............................
Figure 5-11: Rise time test setup for the TCP303 and TCP404XL .......................................
Figure 5-12: Bandwidth test setup for TCP303 .............................................................
Figure 6-1: Amplifier adjustments..............................................................................
Figure 6-2: Gain adjustment locations .........................................................................
Figure 6-3: TCP305 and TCP312 DC gain adjustment location ............................................
Figure 6-4: DC gain adjustment setup for TCP305 and TCP312 ...........................................
Figure 6-5: TCP303 and TCP404XL adjustment locations..................................................
Figure 6-6: TCP303 and TCP404XL transient response and coarse gain adjustment setup ...........
Figure 6-7: DC gain accuracy adjustment setup ............................................................
Figure 7-1: Removing the case from the amplifier ...........................................................
Figure 7-2: Removing the right-side inner panel .............................................................
Figure 7-3: Removing the left-side inner panel ...............................................................
Figure 7-4: Disconnecting the front-panel assembly .........................................................
Figure 7-5: Removing the three heat sink clips ...............................................................
Figure 7-6: Removing the amplifier board ....................................................................
Figure 7-7: Replacing the power supply .......................................................................
Figure 7-8: Removing the AC power connector ............................................................
Figure 7-9: Removing the fan.................................................................................
Figure 7-10: Removing the strain relief boot................................................................
Figure 7-11: Removing the top half of the probe ...........................................................
Figure 7-12: Removing the probe slide ......................................................................
Figure 7-13: Removing the current transformer ............................................................
Figure 7-14: Removing the circuit board and cable assembly.............................................
Figure 7-15: Removing the handle ...........................................................................
Figure 7-16: Removing the current transformer ............................................................
Figure 7-17: Removing the circuit board and cable ........................................................
Figure 7-18: Displaying the amplifier firmware version number .........................................
Figure 8-1: TCPA300 and TCPA400 replaceable parts ......................................................
Figure 8-2: TCPA300 and TCPA400 standard accessories ..................................................
Figure 8-3: TCPA300 and TCPA400 optional accessories...................................................
Figure 8-4: TCP305 and TCP312 replaceable parts ..........................................................
Figure 8-5: TCP303 replaceable parts .........................................................................
Figure 8-6: TCP404XL replaceable parts....................................................................
vi
5-15
5-21
5-25
5-27
5-34
5-37
5-40
6-3
6-4
6-5
6-7
6-9
6-11
6-15
7-3
7-4
7-5
7-6
7-7
7-8
7-9
7-10
7-11
7-13
7-14
7-14
7-15
7-16
7-17
7-18
7-19
7-21
8-2
8-5
8-6
8-7
8-9
8-11
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Table of Contents
List of Tables
Table 1-1: Amplifier options ....................................................................................
Table 1-2: Service options.......................................................................................
Table 3-1: Unpowered circuit degauss limits..................................................................
Table 3-2: Automobile charging systems test setup ........................................................
Table 3-3: Troubleshooting....................................................................................
Table 3-4: Amplifier error codes..............................................................................
Table 4-1: Warranted TCPA300 and TCPA400 specifications ..............................................
Table 4-2: Nominal and typical amplifier characteristics ....................................................
Table 4-3: TCPA300 and TCPA400 mechanical characteristics ............................................
Table 4-4: Probe mechanical characteristics...................................................................
Table 4-5: Shipping weights and dimensions .................................................................
Table 4-6: Environmental characteristics ......................................................................
Table 4-7: Safety compliance information...................................................................
Table 5-1: Amplifier checks .....................................................................................
Table 5-2: Probe performance verification checks............................................................
Table 5-3: Required test equipment ............................................................................
Table 5-4: Equipment settings ..................................................................................
Table 5-5: DC gain accuracy test for the TCPA300 and TCPA400 .........................................
Table 5-6: Equipment settings for bandwidth check........................................................
Table 5-7: TCPA300 bandwidth measurements.............................................................
Table 5-8: TCPA400 bandwidth measurements.............................................................
Table 5-9: TCPA300 and TCPA400 AC coupling measurements.........................................
Table 5-10: Maximum current ratings for TCPA300-compatible probes ................................
Table 5-11: Required test equipment .........................................................................
Table 5-12: Equipment settings for DC gain accuracy .....................................................
Table 5-13: DC gain accuracy test for the TCP305 and TCP312 .........................................
Table 5-14: Equipment settings for rise time ................................................................
Table 5-15: Equipment settings for bandwidth..............................................................
Table 5-16: Bandwidth test for the TCP305 and TCP312 .................................................
Table 5-17: Required test equipment .........................................................................
Table 5-18: Equipment settings for DC gain accuracy .....................................................
Table 5-19: DC gain accuracy test worksheet for the TCP303 and TCP404XL ........................
Table 5-20: Equipment settings for rise time ................................................................
Table 5-21: Equipment settings for bandwidth..............................................................
Table 5-22: Bandwidth test for the TCP303 .................................................................
Table 6-1: Amplifier and probe adjustments ..................................................................
Table 6-2: Required test equipment ............................................................................
Table 6-3: TCPA300 gain adjustments.........................................................................
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
1-2
1-3
3-1
3-10
3-17
3-20
4-1
4-2
4-3
4-4
4-4
4-5
4-11
5-1
5-1
5-3
5-7
5-7
5-10
5-12
5-12
5-14
5-16
5-20
5-21
5-23
5-26
5-28
5-29
5-33
5-34
5-36
5-38
5-41
5-42
6-1
6-2
6-3
vii
Table of Contents
Table 6-4: TCPA400 gain adjustments.........................................................................
Table 6-5: Required test equipment ............................................................................
Table 6-6: Settings for DC gain adjustment ...................................................................
Table 6-7: DC gain accuracy adjustments for the TCP305 and TCP312...................................
Table 6-8: Required test equipment ............................................................................
Table 6-9: Settings for transient response and preliminary gain adjustments............................
Table 6-10: Equipment settings for DC gain accuracy .....................................................
Table 6-11: DC gain accuracy adjustments for the TCP303 and TCP404XL ...........................
Table 7-1: Equipment required..................................................................................
Table 7-2: Equipment required................................................................................
Table 7-3: Amplifier hardware faults.........................................................................
Table 7-4: Probe hardware faults .............................................................................
Table 8-1: TCPA300 and TCPA400 replaceable parts list ...................................................
Table 8-2: Power cord identification ...........................................................................
Table 8-3: TCPA300 and TCPA400 standard accessories parts list.........................................
Table 8-4: TCPA300 and TCPA400 optional accessory parts list...........................................
Table 8-5: TCP305 and TCP312 replaceable parts list .......................................................
Table 8-6: TCP303 replaceable parts list ....................................................................
Table 8-7: TCP404XL replaceable parts list ................................................................
viii
6-4
6-5
6-6
6-7
6-8
6-11
6-16
6-16
7-2
7-12
7-20
7-20
8-3
8-4
8-5
8-6
8-8
8-10
8-12
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
General Safety Summary
General Safety Summary
Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it.
To avoid potential hazards, use this product only as specified.
Only qualified personnel should perform service procedures.
While using this product, you may need to access other parts of a larger system.
Read the safety sections of the other component manuals for warnings and
cautions related to operating the system.
To Avoid Fire or Personal
Injury
Use Proper Power Cord. Use only the power cord specified for this product and
certified for the country of use.
Use Proper Voltage Setting. Before applying power, ensure that the line selector
is in the proper position for the source being used.
Connect and Disconnect Properly. Do not connect or disconnect probes or test
leads while they are connected to a voltage source.
Connect and Disconnect Properly. De-energize the circuit under test before
connecting or disconnecting the current probe.
Connect and Disconnect Properly. Connect the probe output to the measurement
instrument before connecting the probe to the circuit under test. Connect the
probe reference lead to the circuit under test before connecting the probe input.
Disconnect the probe input and the probe reference lead from the circuit under test
before disconnecting the probe from the measurement instrument.
Ground the Product. This product is grounded through the grounding conductor
of the power cord. To avoid electric shock, the grounding conductor must be
connected to earth ground. Before making connections to the input or output
terminals of the product, ensure that the product is properly grounded.
Ground the Product. This product is indirectly grounded through the grounding
conductor of the mainframe power cord. To avoid electric shock, the grounding
conductor must be connected to earth ground. Before making connections to
the input or output terminals of the product, ensure that the product is properly
grounded.
Observe All Terminal Ratings. To avoid fire or shock hazard, observe all ratings
and markings on the product. Consult the product manual for further ratings
information before making connections to the product.
The inputs are not rated for connection to mains or Category II, III, or IV circuits.
Connect the probe reference lead to earth ground only.
Do not apply a potential to any terminal, including the common terminal, that
exceeds the maximum rating of that terminal.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
ix
General Safety Summary
Do not connect a current probe to any wire that carries voltages above the current
probe voltage rating.
Power Disconnect. The power switch disconnects the product from the power
source. See instructions for the location. Do not block the power switch; it must
remain accessible to the user at all times.
Power Disconnect. The power cord disconnects the product from the power source.
Do not block the power cord; it must remain accessible to the user at all times.
Do Not Operate Without Covers. Do not operate this product with covers or panels
removed.
Do Not Operate With Suspected Failures. If you suspect that there is damage to this
product, have it inspected by qualified service personnel.
Avoid Exposed Circuitry. Do not touch exposed connections and components
when power is present.
Replace Batteries Properly. Replace batteries only with the specified type and
rating.
Recharge Batteries Properly. Recharge batteries for the recommended charge
cycle only.
Use Proper AC Adapter. Use only the AC adapter specified for this product.
Use Proper Fuse. Use only the fuse type and rating specified for this product.
Wear Eye Protection. Wear eye protection if exposure to high-intensity rays or
laser radiation exists.
Do Not Operate in Wet/Damp Conditions.
Do Not Operate in an Explosive Atmosphere.
Keep Product Surfaces Clean and Dry.
Provide Proper Ventilation. Refer to the manual’s installation instructions for
details on installing the product so it has proper ventilation.
Terms in this Manual
These terms may appear in this manual:
WARNING. Warning statements identify conditions or practices that could result
in injury or loss of life.
CAUTION. Caution statements identify conditions or practices that could result in
damage to this product or other property.
x
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
General Safety Summary
Symbols and Terms on the
Product
These terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you read
the marking.
WARNING indicates an injury hazard not immediately accessible as you
read the marking.
CAUTION indicates a hazard to property including the product.
The following symbol(s) may appear on the product:
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
xi
Service Safety Summary
Service Safety Summary
Only qualified personnel should perform service procedures. Read this Service
Safety Summary and the General Safety Summary before performing any service
procedures.
Do Not Service Alone. Do not perform internal service or adjustments of this
product unless another person capable of rendering first aid and resuscitation is
present.
Disconnect Power. To avoid electric shock, switch off the instrument power, then
disconnect the power cord from the mains power.
Use Care When Servicing With Power On. Dangerous voltages or currents may
exist in this product. Disconnect power, remove battery (if applicable), and
disconnect test leads before removing protective panels, soldering, or replacing
components.
To avoid electric shock, do not touch exposed connections.
xii
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Compliance Information
This section lists the EMC (electromagnetic compliance), safety, and
environmental standards with which the instrument complies.
EMC Compliance
EC Declaration of
Conformity – EMC
Meets intent of Directive 2004/108/EC for Electromagnetic Compatibility.
Compliance was demonstrated to the following specifications as listed in the
Official Journal of the European Communities:
EN 61326-1:2006, EN 61326-2-1:2006. EMC requirements for electrical equipment
for measurement, control, and laboratory use. 1 2 3
CISPR 11:2003. Radiated and conducted emissions, Group 1, Class A
IEC 61000-4-2:2001. Electrostatic discharge immunity
IEC 61000-4-3:2002. RF electromagnetic field immunity
IEC 61000-4-4:2004. Electrical fast transient/burst immunity
IEC 61000-4-5:2001. Power line surge immunity
IEC 61000-4-6:2003. Conducted RF immunity
IEC 61000-4-11:2004. Voltage dips and interruptions immunity 4
EN 61000-3-2:2006. AC power line harmonic emissions
EN 61000-3-3:1995. Voltage changes, fluctuations, and flicker
European Contact.
Tektronix UK, Ltd.
Western Peninsula
Western Road
Bracknell, RG12 1RF
United Kingdom
1
This product is intended for use in nonresidential areas only. Use in residential areas may cause electromagnetic
interference.
2
Emissions which exceed the levels required by this standard may occur when this equipment is connected to a
test object.
3
To ensure compliance with the EMC standards listed here, high quality shielded interface cables should be used.
4
Performance Criterion C applied at the 70%/25 cycle Voltage-Dip and the 0%/250 cycle Voltage-Interruption test
levels (IEC 61000-4-11).
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
xiii
Compliance Information
Australia / New Zealand
Declaration of
Conformity – EMC
FCC – EMC
xiv
Complies with the EMC provision of the Radiocommunications Act per the
following standard.
CISPR 11:2003. Radiated and Conducted Emissions, Group 1, Class A, in
accordance with EN 61326-1:2006 and EN 61326-2-1:2006.
Emissions are within the limits of FCC 47 CFR, Part 15, Subpart B for Class A
equipment.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Compliance Information
Environmental Considerations
This section provides information about the environmental impact of the product.
Product End-of-Life
Handling
Observe the following guidelines when recycling an instrument or component:
Equipment Recycling. Production of this equipment required the extraction and
use of natural resources. The equipment may contain substances that could be
harmful to the environment or human health if improperly handled at the product’s
end of life. In order to avoid release of such substances into the environment and
to reduce the use of natural resources, we encourage you to recycle this product
in an appropriate system that will ensure that most of the materials are reused or
recycled appropriately.
This symbol indicates that this product complies with the applicable European
Union requirements according to Directives 2002/96/EC and 2006/66/EC
on waste electrical and electronic equipment (WEEE) and batteries. For
information about recycling options, check the Support/Service section of the
Tektronix Web site (www.tektronix.com).
Restriction of Hazardous
Substances
This product has been classified as Monitoring and Control equipment, and is
outside the scope of the 2002/95/EC RoHS Directive.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
xv
Compliance Information
xvi
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Preface
This Instruction Manual supports the operation and basic maintenance of the
TCPA300 and TCPA400 Current Probe Amplifiers, and the TCP300/400 Series
AC/DC current probes that mate with the amplifiers. The current probes covered
in this manual are listed below:
TCP312 (30 A, 100 MHz, compatible with TCPA300)
TCP305 (50 A, 50 MHz, compatible with TCPA300)
TCP303 (150 A, 15 MHz, compatible with TCPA300)
TCP404XL (500 A*, 2 MHz, compatible with TCPA400) *750 A DC derated
with duty cycle
If you are not familiar with these products, please refer to the Getting Started and
Operating Basics chapters of this manual for basic operating information.
If you are an advanced user, the Reference section contains information on
advanced applications as well as user diagnostic and troubleshooting information.
The Performance Verification and Adjustment Procedure sections support the
qualification and calibration of the probes when used with either amplifier.
The Maintenance section supports the routine maintenance and repair of
mechanical parts associated with the amplifiers.
The Glossary and Index are provided as quick reference locators for important
information.
Manual Conventions
The term "amplifier" is used to refer to either the TCPA300 or TCPA400 when
referring to common attributes. If a subject is unique to either amplifier, the
amplifier will be referred to directly by model.
The terms "current probe" and "probe" are used to refer to any of the TCP300/400
Series current probes when referring to common attributes. If a subject is unique
to a particular probe, the probe will be referred to directly by model.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
xvii
Preface
xviii
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Getting Started
Getting Started
The TCPA300 and TCPA400 current probe amplifiers let you use one probe to
simultaneously measure AC and DC current. The amplifiers convert the sensed
current into a proportional voltage signal that you can measure directly with an
oscilloscope.
The TCPA300 and TCPA400 current probe amplifiers provide better linearity
than other current measurement systems because of a current feedback process
used with the probe. DC measurement capability and high bandwidth allow the
amplifiers to accurately represent square waves and fast-rise signals.
The TCPA300 and TCPA400 and associated probes provide these features:
Simultaneous DC and AC current measurements up to 750 A peak
High sensitivity
One-button autobalancing and probe degaussing
No adjustments needed to match a current probe to an individual amplifier
AC or DC coupling of signal
Direct scaling and unit readout on compatible TEKPROBE level II
oscilloscopes
System Configuration
A complete current measurement system consists of a current probe amplifier, a
compatible current probe, and an appropriate oscilloscope. (See Figure 1-1.)
Figure 1-1: Typical TCPA300/400 current measurement system
TCPA300 and TCPA400
Current Probe Amplifiers
The amplifier amplifies the current sensed by the probe and converts the current
to a proportional voltage that is displayed on an oscilloscope or other similar
measuring device.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
1–1
Getting Started
Current Probes
The following Tektronix current probes are compatible with the
TCPA300 Amplifier:
TCP312 (30 A, 100 MHz)
TCP305 (50 A, 50 MHz)
TCP303 (150 A, 15 MHz)
The following Tektronix current probes are compatible with the
TCPA400 Amplifier:
TCP404XL (750 A 1, 2 MHz)
1
500 A continuous, 750 A DC derated with duty cycle
You can also use the CT-4 High-Current Transformer with the TCP305 and
TCP312 current probes to extend the AC current measurement range to 20,000
peakA.
Oscilloscope
An oscilloscope displays the output from the current measuring system. A 50 Ω
cable is included to connect the amplifier to the oscilloscope input channel. A
TEKPROBE-to-TEKPROBE interface cable is also included for connecting to
TEKPROBE level II oscilloscopes.
If the oscilloscope does not have an input that can be set to 50 Ω impedance, you
need a feedthrough 50 Ω termination. This termination is included as a standard
accessory with your TCPA300 and TCPA400 Current Probe Amplifiers.
Options
Table 1-1 lists options that are available for the TCPA300 and TCPA400
amplifiers.
Table 1-1: Amplifier options
Option
Description
A1
Universal Euro power cord
A2
United Kingdom power cord
A3
Australia power cord
A5
Switzerland power cord
A6
Japan power cord
AC
China power cord
A99
No power cord
L5
Japanese Instruction Manual
Tektronix service options that you can order for your amplifiers and probes are
listed in this section. (See Table 1-2.) Designed to support tracking of calibration
to requirements of ISO9000 and to provide for extended repair coverage, these
1–2
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Getting Started
options help fix your long-term maintenance costs and eliminate unplanned
expenditures. Tektronix Service Options are available at the time you order your
instrument. Contact your local Tektronix Sales Office for more information.
Table 1-2: Service options
Option
Description
D1
Provides the initial Test Data Report from the
factory on delivery.
C3
Provides factory calibration certification on
delivery, plus two more years of calibration
coverage. Throughout the coverage period,
the instrument will be calibrated according to
its Recommended Calibration Interval.
D3
Provides test data on delivery plus a Test
Data Report for every calibration performed
during three years of coverage (requires
Option C3).
R3
Extends product repair warranty to a total of
three years.
C5
Provides factory calibration certification on
delivery, plus four more years of calibration
coverage. Throughout the coverage period,
the instrument will be calibrated according to
its Recommended Calibration Interval.
D5
Provides test data on delivery plus a Test
Data Report for every calibration performed
during five years of coverage (requires
Option C5).
R5
Extends product repair warranty to a total of
five years.
Standard Accessories
The following accessories are shipped with the amplifiers and probes. (See
page 8-1, Replaceable Parts.)
Amplifiers
The following accessories are shipped with the TCPA300 and TCPA400
amplifiers.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
1–3
Getting Started
Power Cord (customer-chosen option)
BNC Cable
Termination, 50 Ω 2W
TEKPROBE Interconnect Cable
Instruction Manual (English or Japanese; customer-chosen language option)
Certificate of Traceable Calibration
Probes
When you order a current probe, you will receive these accessories:
Probe cover
Probe ground lead, 6 inch length (TCP305 and TCP312 only)
Instruction Sheet
Certificate of Traceable Calibration
Optional Accessories
You can order the following optional accessories for the amplifiers and probes.
(See page 8-1, Replaceable Parts.)
One-turn 50 Ω current loop. The current loop is used in the performance
verification procedure for checking the performance of the TCPA300 Amplifier
and the compatible probes.
CT-4 High-Current Transformer. If you need to measure high-amplitude AC
currents, consider using the CT-4 with the TCP303 and TCP312 probes. The
CT-4 provides step-down ratios of 20:1 or 1000:1. For more information
about the CT-4, consult your Tektronix sales representative.
TCPA Calibration Adapter. Use the TCPA Calibration Adapter to verify the
amplifier(s) performance independent of the current probes.
Travel Case. The travel case includes room to store one amplifier and two
current probes, along with related cables and adapters.
Deskew Fixture. This fixture converts the PROBE COMPENSATION output
or TRIGGER OUTPUT of the TDS5000 or TDS7000 into a set of test point
connections that allow you a convenient way to compensate for timing
differences between voltage and current probes.
Probe Covers
The TCP300/400 Series Current Probes come with a probe cover that stores the
probe when not in use. Use the probe cover to hold your probe in a convenient
1–4
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Getting Started
place at your bench or workstation when you are not using it. You can attach the
probe cover to the side of the bench to keep the probe off of your work surface.
(See Figure 1-2.)
Figure 1-2: Using the probe covers
Travel Case
The travel case is a recommended accessory for the TCPA300/400 Amplifiers.
The travel case includes room to store one amplifier and two TCP300/400 Series
Current Probes, one of each size. (For example, you can store a TCP305 and
a TCP303 probe.) A compartment is included to store associated cables and
terminations. (See Figure 1-3.)
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
1–5
Getting Started
Figure 1-3: Equipment locations in the travel case
Connecting the Amplifier to an Oscilloscope
You will need an oscilloscope to display the TCPA300 and TCPA400 measurement
output. To use the full dynamic range of the probe/amplifier combination, the
oscilloscope must be capable of displaying a vertical scale factor of 1 mV/div to
1 V/div.
If you are using a TEKPROBE II-compatible oscilloscope, use the
TEKPROBE-to-TEKPROBE interface cable. Otherwise, use the supplied
50 Ω BNC cable to connect the amplifier OUTPUT connector to your oscilloscope.
(See Figure 1-1 on page 1-1.)
The input impedance of the oscilloscope channel must be 50 Ω, or you will
encounter slowed pulse response, increased aberrations, or incorrect DC
measurement amplitudes. If your oscilloscope provides only 1 M Ω inputs, you
need to attach a 50 Ω feed-through termination between the oscilloscope input
and the BNC cable. Do not install this termination at the amplifier end of the
BNC cable.
To utilize the full bandwidth capability of the TCPA300 and TCPA400 and
attached current probe, the oscilloscope bandwidth must be approximately five
times that of the current probe. For example, when using a TCP312 Current
Probe, the oscilloscope bandwidth must be at least 500 MHz. When using a
TCP305 Current Probe, the oscilloscope bandwidth must be at least 250 MHz.
1–6
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Getting Started
After you have connected the amplifier to the oscilloscope, allow the equipment
to warm up to a stable temperature; usually 20 minutes is required.
Power on the Amplifier
Connect the power cord to the power input connector on the rear of the amplifier,
and then connect the power cord to your local mains supply (100 VAC to
240 VAC, 50 Hz to 400 Hz). To allow for proper ventilation, place the rear panel
of the amplifier at least 2 inches away from any obstructions. Set the amplifier on
the bottom rubber feet, and keep papers and other items away from the bottom of
the amplifier which could restrict airflow and cause overheating.
Power on the amplifier by pressing the ON/STANDBY button at the lower-left
corner of the front panel. The amplifier goes through a self-test and cycles the
front-panel LEDs.
NOTE. The amplifier stores the power state it is in when the power cord is
unplugged. If you do not put the amplifier into STANDBY mode before unplugging
it, the amplifier will power on immediately when you plug it in again.
When you connect a probe to the amplifier, the amplifier uses detection circuitry
to indicate probe conditions such as noncompatible probe type and probe open.
Connecting a Current Probe to the Amplifier
To connect a current probe to the amplifier input connector, align the red dot on
the probe connector with the red dot on the amplifier front panel, as shown. Push
the probe connector in to lock the connector. Do not twist the connector. The
connector locks into place when you push it all the way into the front panel.
If you connect a probe to the wrong amplifier, (for example, a TCP312 to a
TCPA400), the NONCOMPATIBLE PROBE TYPE LED illuminates. Disconnect
the probe and use the correct amplifier. The TCPA400 amplifier accepts TCP3XX
probes, but will only operate properly with TCP4XX probes.
To disconnect the probe from the amplifier, pull back on the connector housing
and pull the connector straight off the front panel.
CAUTION. Handle current probes with care. Do not drop a probe or subject it to
impact, or the core may crack.
Do not connect or disconnect a current probe while the probe is clamped around a
live conductor, or the probe may suffer electrical damage.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
1–7
Getting Started
Figure 1-4: Connecting and disconnecting a current probe to the amplifier
Each current probe is calibrated before it is shipped, and should not require
further adjustment. If a probe requires adjustment, information is available in
this manual. (See page 6-1, Adjustment Procedures Overview.) The adjustment
procedure must be performed only by qualified service personnel. Contact your
nearest Tektronix Service Center if you need more assistance.
Operating the Current Probe Slide
The current probes each have a slide mechanism that opens and closes the probe
jaw. This allows you to clamp the probe around a conductor under test. The slide
must be locked closed to accurately measure current or to degauss the probe. If a
probe is unlocked, the PROBE OPEN indicator on the amplifier will light.
WARNING. Do not clamp the TCP305 or TCP312 current probes around
uninsulated wires. Damage to the probe or personal injury may result. Only use
the TCP305 or TCP312 current probes on INSULATED wires.
The TCP303 and TCP404XL current probes can be used to measure current on
uninsulated wires. However, the circuit must be de-energized when connecting or
removing the current probe.
The slide operation of the TCP305 and TCP312 current probes is shown in the
following illustration. (See Figure 1-5.) To open the probe, pull the slide back
until the jaw is open. To lock the probe, push the slide forward until the detent
snaps into place.
1–8
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Getting Started
Figure 1-5: TCP312 and TCP305 slide operation
The slide operation of the TCP303 and TCP404XL current probes is shown in the
following illustration. (See Figure 1-6.) To open the probe, press the bottom of
the lock button and squeeze the handle until the core is open. To lock the probe,
release the squeeze handle and press the top of the lock button.
Figure 1-6: TCP303 and TCP404XL slide operation
Degaussing and Autobalancing the Current Probe
Degaussing the probe removes any residual magnetization from the probe core.
Such residual magnetization can induce measurement error. Autobalancing
removes unwanted DC offsets in the amplifier circuitry. Failure to degauss the
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
1–9
Getting Started
probe is a leading cause of measurement errors. The DEGAUSS LED flashes
until you degauss the probe.
To degauss the probe, disconnect the probe from the test circuit, or ensure that
the conductor under test has no power, close and lock the slide, and then press
the amplifier PROBE DEGAUSS AUTOBALANCE button on the front panel of
the amplifier. To maintain measurement accuracy, degauss your probe in each of
these cases:
After you turn on the amplifier and allow a 20-minute warm-up period.
Before you connect the probe to a conductor.
Whenever a current or thermal overload condition occurs.
Whenever you connect a new probe.
Whenever you subject the probe to a strong external magnetic field.
Periodically during normal use.
To degauss and autobalance a current probe, perform these steps:
1. Verify that the current probe is connected to the amplifier.
2. Remove the current probe from the conductor under test.
3. Lock the probe slide closed. (See Figure 1-5.) (See Figure 1-6.)
4. Press the amplifier PROBE DEGAUSS AUTOBALANCE button.
5. Wait about five seconds for the degauss procedure to complete.
The PROBE DEGAUSS AUTOBALANCE LED glows green when the
operation has successfully completed. If the LED is blinking orange, the degauss
operation is still in progress. If the LED is red, the operation failed, and the cause
of the failure needs to be found and fixed. (See page 2-1, PROBE DEGAUSS
AUTOBALANCE Button and Indicator.)
NOTE. The degauss procedure will fail if the amplifier is not properly connected
to an oscilloscope having 50 Ω input impedance. If this occurs, the NOT
TERMINATED INTO 50 Ω LED lights on the amplifier front panel.
After you have completed the oscilloscope adjustments and the amplifier
degauss/autobalance procedure, your system is ready to measure current.
1–10
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Getting Started
DC Measurements
To measure DC current, perform these steps:
1. Verify that the amplifier and the oscilloscope input coupling are set to DC,
and the input impedance is set to 50 Ω.
2. Lock the probe closed without a conductor passing through it.
3. Adjust the ground reference of the oscilloscope to move the trace to the
desired graticule line.
4. Press the amplifier PROBE DEGAUSS AUTOBALANCE button.
The NOT TERMINATED INTO 50 Ω LED is lighted if impedance is not
50 Ω. If this is the case, make necessary changes. (For example, use a 50 Ω
termination.)
5. After the degauss/autobalance routine completes, adjust the ground reference
(if necessary) using the amplifier MANUAL BALANCE controls.
WARNING. Do not clamp the TCP305 or TCP312 current probes around
uninsulated wires. Damage to the probe or personal injury may result. Only use
the TCP305 or TCP312 current probes on INSULATED wires.
The TCP303 and TCP404XL current probes can be used to measure current on
uninsulated wires. However, the circuit must be de-energized when connecting or
removing the current probe.
6. Open the probe slide, place the probe around the conductor under test, and
then lock the slide. For correct measurement polarity, make sure the probe
arrow is pointing in the direction of conventional (positive to negative) current
flow. Reversing the flow will display the current waveform upside-down on
the oscilloscope.
7. Adjust the oscilloscope time base, trigger, and gain as needed.
Shown is a current probe connected to a power supply line. (See Figure 1-7.)
Notice that the probe arrow points toward the negative terminal of the power
supply to conform to the conventional current flow of positive (+) to negative (-).
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
1–11
Getting Started
Figure 1-7: Current probe polarity
AC Measurements
To measure AC current only, and remove the DC component of the current being
measured, follow the instructions below. These are identical to the instructions for
DC current measurements except that the amplifier coupling in step 2 is set to AC.
1–12
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Getting Started
1. Verify that the oscilloscope input coupling is set to DC.
2. Verify that the amplifier input coupling is AC, and the input impedance is set
to 50 Ω. (The NOT TERMINATED INTO 50 Ω LED is on if impedance
is not 50 Ω.)
3. Adjust the ground reference of the oscilloscope to move the trace to the
desired graticule line.
4. Lock the probe closed without a conductor passing through it, and then press
the amplifier PROBE DEGAUSS AUTOBALANCE button.
WARNING. Do not clamp the TCP305 or TCP312 current probes around
uninsulated wires. Damage to the probe or personal injury may result. Only use
the TCP305 or TCP312 current probes on INSULATED wires.
The TCP303 and TCP404XL current probes can be used to measure current on
uninsulated wires. However, the circuit must be de-energized when connecting or
removing the current probe.
5. Open the probe slide, place the probe around the conductor under test, and
then lock the slide. For correct measurement polarity, make sure the probe
arrow is pointing in the direction of conventional (positive to negative)
current flow. Reversing the flow will invert the displayed current waveform
on the oscilloscope.
NOTE. Even when making AC current measurements, leave the oscilloscope
coupling on DC. Change only the amplifier coupling to AC. Using the oscilloscope
AC coupling may cause the amplifier to exceed its output dynamic range.
6. Adjust the oscilloscope time base and trigger as needed.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
1–13
Getting Started
1–14
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Operating Basics
Control Summary
This section describes the function of each TCPA300 and TCPA400 front panel
control and connector. The overview shows most functions and is followed by a
detailed description. (See Figure 2-1.)
Some seldom-used functions do not appear in the illustration. These functions are
completely discussed in the detailed descriptions that follow this illustration.
Figure 2-1: The TCPA300 front panel
TCPA300 and TCPA400 Controls
These front panel controls and indicators are common to both the TCPA300 and
TCPA400 current probe amplifiers, unless otherwise indicated.
PROBE DEGAUSS
AUTOBALANCE Button
and Indicator
When pressed, this button performs two functions that maximize measurement
accuracy. First, the amplifier generates a degauss signal to remove any residual
magnetism from the attached current probe. Second, the amplifier initiates an
operation to remove any undesired DC offsets from the circuitry. During the
degauss process, the amplifier is busy and cannot be used to measure current.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
2–1
Control Summary
The indicator light next to the PROBE DEGAUSS AUTOBALANCE button
blinks red whenever the amplifier detects that the current probe needs degaussing.
The amplifier cannot detect all circumstances that require probe degaussing,
so you may need to degauss the probe at times when the PROBE DEGAUSS
AUTOBALANCE light is not blinking red. The red blinking light serves as a
reminder to degauss the current probe when one of the following conditions
occurs:
The amplifier has just been turned on with a current probe connected.
The current probe has been changed.
An overload was detected.
To perform the probe degauss/autobalance function, remove the probe from
all conductors (or ensure that the conductor under test has no power), make
sure the probe is locked closed, and then press the PROBE DEGAUSS
AUTOBALANCE button. The probe degauss/autobalance routine will not pass
if the current probe is disconnected from the amplifier input, or if it is unlocked
(the PROBE OPEN LED is on).
The indicator blinks orange during the time the amplifier is busy performing
the probe degauss functions. When the degauss and autobalance procedure is
complete, the indicator light turns green.
The PROBE DEGAUSS AUTOBALANCE indicator light will be orange if
the MANUAL BALANCE buttons have been pressed after a degauss has been
successfully completed. This indicates that the DC offset value has been manually
changed from the original value set during the degauss routine. Depending on
the amount of offset (balance) you have entered with the MANUAL BALANCE
buttons, another degauss operation may be necessary to ensure accurate
measurements. Generally, if you change the DC offset by more than 5 divisions,
you should de-energize the circuit under test and perform another degauss routine.
Then, re-energize the circuit and take your measurements.
If the degauss operation has failed, and the AC and DC COUPLING LEDs are
alternately flashing, this indicates the amplifier is displaying an error code with
the four status LEDs on the lower-left front panel.
(See page 3-19, Displaying Error Codes with the Probe Degauss Autobalance
Button.)
NOTE. The NOT TERMINATED INTO 50 Ω LED is on when the amplifier
output is not properly terminated into a 50 Ω load. Make sure your amplifier
OUTPUT is connected to an oscilloscope input using a 50 Ω BNC cable, and
that the oscilloscope input is set to 50 Ω impedance. Proper cabling is shown.
(See Figure 1-1 on page 1-1.)
2–2
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Control Summary
If your oscilloscope does not have 50 Ω impedance settings for inputs, you can
place a 50 Ω feed-through termination on the oscilloscope input and connect
the amplifier output cable to the termination. Do not place the feed-through
termination at the amplifier end of the BNC connecting cable.
MANUAL BALANCE
Buttons and Indicator
PROBE OPEN Indicator
OVERLOAD Indicator
The MANUAL BALANCE buttons allow you to fine-adjust the DC offset that
appears at the amplifier OUTPUT connector. The manual balance adjustment
only functions when the amplifier is set to DC coupling, and the MANUAL
BALANCE indicator is only lighted after you press one of the MANUAL
BALANCE buttons in DC coupling mode.
When lit, this indicator informs you that the current probe is unlocked. You must
have the probe slide locked to degauss the probe or to accurately measure current.
When this LED is red, it informs you that the measurement you are taking
exceeds the continuous.
When this LED is orange, it indicates that the safe operating temperature of the
probe, and possibly the amplifier, has been exceeded. Disconnect the probe from
the current source and allow time for the probe head and amplifier to cool.
When this LED blinks red and orange, it indicates that both the safe operating
temperature of the probe and the current limit have been exceeded.
WARNING. To avoid personal injury or equipment damage, do not exceed the
specified electrical limits of the TCPA300 and TCPA400 or any applicable
accessories.
NOT TERMINATED
When lit, this indicator informs you that the TEKPROBE interface cable or BNC
cable from the OUTPUT of the amplifier is not connected to a 50 Ω input on the
oscilloscope. You need to switch the termination setting on the oscilloscope to
50 Ω, or use a 50 Ω termination on the oscilloscope input.
NOTE. NOT TERMINATED INTO 50 Ω is only detected during the DEGAUSS
AUTOBALANCE operation.
NONCOMPATIBLE
When lit, this indicator informs you that the probe that is connected to the
amplifier is not designed to work with the amplifier. TCP3XX probes only work
with the TCPA300 Amplifier, and the TCP404XL probe only works with the
TCPA400 Amplifier.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
2–3
Control Summary
ON/STANDBY Button
Use this button to power on the amplifier. When the amplifier is in STANDBY
mode, the amplifier is in a limited-power mode. Most of the secondary circuitry is
disabled, but the line voltage remains connected to the amplifier power supply.
RANGE Button
Press the RANGE button to toggle between the scale factors (sensitivity settings)
of the probe attached to the TCPA300. If no RANGE LEDs are lit, this indicates a
probe is not connected to the amplifier.
COUPLING Button and
Indicators
The COUPLING button determines the coupling between the TCPA300/TCPA400
and the oscilloscope. Press the COUPLING button to toggle between AC and
DC coupling. To couple the amplifier for DC plus AC measurements, use DC
coupling. For AC measurements only, use AC coupling. When the amplifier is set
to AC coupling, the Manual Balance adjustment is disabled since the DC offset
component is not visible on the output waveform.
NOTE. Even when making AC current measurements, leave the oscilloscope
coupling on DC. Change only the amplifier coupling to AC. Using the oscilloscope
AC coupling may cause the amplifier to exceed its output dynamic range.
Under normal operation, the AC and DC COUPLING LEDs indicate the coupling
mode of the amplifier. If they alternately flash after a degauss operation, this
indicates the amplifier is displaying an error code with the four status LEDs on the
lower-left front panel. (See page 3-19, Displaying Error Codes with the Probe
Degauss Autobalance Button.)
PROBE INPUT Connector
All current probes compatible with the TCPA300 and TCPA400 attach at the
PROBE INPUT connector, which is a multi-pin female connector. Information
about connecting a probe is available. (See page 1-7, Connecting a Current Probe
to the Amplifier.)
OUTPUT Connector
The amplifier current measurement output is accessed at the OUTPUT connector,
which should be connected to the oscilloscope input. Attach one end of a 50 Ω
BNC cable to this connector and the other end to a 50 Ω vertical input of your
oscilloscope. The output impedance of the amplifier is 50 Ω.
To get a direct readout of current on your Tektronix oscilloscope, use the
TEKPROBE interface cable to connect the amplifier to your oscilloscope.
2–4
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Control Summary
NOTE. To obtain accurate measurements, the input impedance of your
oscilloscope must be 50 Ω. Make sure your amplifier OUTPUT is connected to an
oscilloscope input using a 50 Ω BNC cable, and that the oscilloscope input is set
to 50 Ω impedance. The proper cabling is shown. (See Figure 1-1 on page 1-1.)
If your oscilloscope does not have 50 Ω impedance settings for inputs, you can
place a 50 Ω feedthrough termination on the oscilloscope input and connect
the amplifier output cable to the termination. Do not place the feedthrough
termination at the amplifier end of the BNC connecting cable.
Probe DC Gain Adjust
(located on probes)
After the PROBE DEGAUSS AUTOBALANCE routine has been run, the probe
and amplifier system will meet all published specifications. However, if you
want to improve the tolerance of the system accuracy, or to intentionally offset
the accuracy to make up for total system errors, you can manually adjust the gain
of the probe. Adjustment locations are shown. (See Figure 6-3 on page 6-5.)
(See Figure 6-5 on page 6-9.)
NOTE. You should be careful to note the existing position of the DC Gain
Adjustment before you alter it, so that you may return it to the initial, calibrated
position. By altering the DC Gain Adjustment, you may cause the probe to not
meet the warranted DC Accuracy specification.
For example, the typical accuracy of the TCP312 probe on the 1 A/V range is
1%. If you want to measure a 3 Ap-p, 1 kHz square wave and need increased
accuracy (better than 0.25% is attainable), first adjust the TCP312 on the 1 A/V
range setting using a calibrated 3 Ap-p, 1 kHz square wave source. Then, attach
the probe to your circuit and take your measurement. Remember, altering the DC
Gain Adjustment may cause the probe to not meet the warranted DC Accuracy
specification.
GPIB Operation
The TCPA300 and TCPA400 Current Probe Amplifiers do not have direct GPIB
connections. However, you can use a computer to control the oscilloscope that the
amplifier is connected to, enabling you to change the time and scale factors of
your current measurements over the oscilloscope GPIB bus.
Refer to your oscilloscope manual for instructions on using the GPIB bus.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
2–5
Control Summary
2–6
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Reference
Reference Notes
These notes are provided to help you utilize the full potential of the TCPA300
and TCPA400 current probe systems.
Degaussing a Probe with an Unpowered Conductor in the Jaws
Under almost all conditions, you can degauss your current probe while a conductor
of an unpowered circuit is clamped in the jaws. The advantage of degaussing
with an unpowered circuit is that any offset from stray DC magnetic fields are
compensated. In an automated environment, degaussing with the conductor in the
probe jaws eliminates the need to manually remove the probe.
NOTE. Be certain that the conductor in the probe jaws is completely unpowered.
Any current flowing through the conductor will cause a residual offset in the
current probe, and the amplifier may report an inaccurate result.
If the impedance of your circuit is higher than that shown, the degauss procedure
succeeds because the amplifier is able to saturate the probe core. (See Figure 3-1
on page 3-2.) While degauss occurs, the probe induces a voltage in the unpowered
circuit as shown. (See Figure 3-1 on page 3-2.) Your circuit must be able to
absorb this induced voltage. With low impedance circuits, several amperes may
be induced in the circuit being measured. This may be of concern when you are
using very small conductors.
Table 3-1: Unpowered circuit degauss limits
Probe type
Minimum circuit
resistance
Maximum induced voltage
TCP312
10 mW
40 mV at 200 Hz
TCP305
5 mW
40 mV at 200 Hz
TCP303
5 mW
30 mV at 200 Hz
TCP404XL
1 mW
15 mV at 100 Hz
Measuring Differential Current
You can place two conductors in a current probe to provide differential or null
current measurement. This avoids the necessity of using two current measurement
systems with a differential oscilloscope.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
3–1
Reference Notes
WARNING. To avoid injury or loss of life from shock or fire, do not put more than
one uninsulated conductor at a time in the TCP303 or TCP404XL probes. Do not
put any uninsulated conductors in the TCP305 or TCP312 probes. An uninsulated
conductor is defined as any conductor without insulation or without insulation
rated for the voltage present on the conductor under test.
An insulated conductor is defined as any conductor that is surrounded by an
insulating material that is capable of isolating the voltage present on the conductor.
Note that lacquer coatings like those typically found on transformer windings do
not provide sufficient, reliable insulation for use with current probes. The lacquer
coating can be easily nicked or damaged, compromising the insulating capabilities
of the lacquer coating.
Do not force the slide closed. Damage to the probe may result. If you cannot close
the slide around the conductor(s), either reduce the number of conductors you are
measuring, or, if possible, take your measurement on a smaller conductor.
1. Orient the two conductors under test so that the polarities oppose each other.
Clamp the current probe around the two conductors as shown. Be careful not
to pinch a conductor in the probe jaws.
2. Measure the current. A waveform above the baseline indicates the conductor
with the conventional current flow in the direction of the probe arrow is
carrying the greater current. Conventional current flows from positive to
negative.
3. To adjust for a current null, adjust the current in one of the conductors until
the displayed measurement is zero.
Figure 3-1: Measuring differential current and nulls
3–2
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Reference Notes
AC and DC Coupling
You can couple the signal input to the TCPA300 and TCPA400 with either DC
or AC coupling. DC coupling shows the DC and AC measurement components
while AC coupling removes the DC component from the displayed signal. When
you use AC coupling, make sure that the input DC current does not exceed the
probe specifications.
AC coupling will affect waveforms at frequencies higher than the AC Coupling
Low-Frequency Bandwidth. For example, pulsed currents may exhibit rolloff or
decreased amplitude. A low-frequency square wave using AC coupling as shown
in illustration (a). (See Figure 3-2.) The signal exhibits low-frequency rolloff. By
changing the amplifier coupling to DC, the pulse is displayed as truly square, as
shown in illustration (b). (See Figure 3-2.)
Figure 3-2: Effect of AC or DC coupling on low-frequency signals
If you are trying to examine a low-frequency signal that is superimposed on a
comparatively large DC component, you can resolve the signal by performing
these steps:
1. Select the range setting that will display the maximum detail without
exceeding the dynamic range of the signal.
2. Adjust the oscilloscope V/div sensitivity (A/div if using the TEKPROBE
interface), to display maximum signal detail.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
3–3
Reference Notes
Maximum Current Limits
Current probes have three maximum current ratings: continuous, pulsed, and
Ampere-second product. Exceeding any of these ratings can saturate the probe
core, magnetizing the core and causing measurement errors. The maximum
current ratings of compatible probes is available.
Maximum Continuous Current refers to the maximum current that can be
continuously measured at DC or at a specified AC frequency. (See page 4-1,
Specifications.) The maximum continuous current value is derated with
frequency; as the frequency increases, the maximum continuous current
rating decreases.
Maximum Pulsed Current refers to the maximum peak value of pulsed current
the probe can accurately measure, regardless of how short (within bandwidth
limitations) the pulse duration is.
Ampere-Second Product defines the maximum width of pulsed current
that you can measure when the pulse amplitude is between the maximum
continuous and maximum pulsed current specifications. The maximum
continuous specification itself varies by frequency.
NOTE. Always degauss the probe after measuring a current that exceeds the
maximum continuous current, maximum pulsed current, or Ampere-second
product rating of the probe. Exceeding these ratings can magnetize the probe
and cause measurement errors.
To determine if your measurement exceeds the Ampere-second product, perform
either Procedure A or Procedure B.
Procedure A
To determine the maximum allowable pulse width, measure the peak current of
the pulse as shown in illustration (a). (See Figure 3-3 on page 3-5.) Divide the
Ampere-second (or Ampere-microsecond) specification of your probe by the
measured peak current of the pulse. The quotient is the maximum allowable
pulse width; the pulse width at the 50% point of the measured signal must be
less than this value.
For example, the TCP312 Current Probe has a maximum Ampere-second product
of 500 Arms in the 10 A/V range setting. If a pulse measured with a TCP312 has
a peak current of 40 A, the maximum allowable pulse width would be 500 Arms
divided by 40 A, or 12.5 μs.
3–4
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Reference Notes
Figure 3-3: Applying the amp-second product rule
Procedure B
To determine the maximum allowable pulse amplitude, measure the pulse
width at the 50% points as shown illustration (b). (See Figure 3-3.) Divide the
Ampere-second (or Ampere- microsecond) specification of your probe by the
pulse width. The quotient is the maximum allowable current; the peak amplitude
of the measured pulse must be less than this value.
For example, the TCP312 Current Probe has a maximum Ampere-second product
of 500 Arms in the 10 A/V range setting. If a pulse measured with a TCP312
probe has a width of 15 μs, the maximum allowable peak current would be
500 Arms divided by 15 μs, or 33.3 A.
Measuring Noncontinuous Current with the TCP404XL Probe
When you measure a noncontinuous current with the TCP404XL probe, you
need to take into consideration several factors to ensure that you make accurate
measurements and do not trip the thermal overload circuit. The amplitude
and duty cycle of the continuous and noncontinuous current, and the ambient
temperature, all affect the maximum amount of time allowed for the measurement,
which defines the safe operating area of the probe.
You can calculate the duty cycle of the continuous and noncontinuous
current when you know the duration of the noncontinuous current (defined as
measurement time) and the measurement period. A continuous and noncontinuous
current is shown and how to calculate the duty cycle. (See Figure 3-4.)
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
3–5
Reference Notes
Figure 3-4: Duty cycle calculation
After you calculate the duty cycle of the noncontinuous current you are
measuring, you can use the other factors (continuous and noncontinuous current
amplitude, etc.) to compare your measurement to those shown. (See Figure 4-8
on page 4-10.) (See Figure 4-10 on page 4-11.)
You can see how duty cycle affects the measurement time by looking at any
of the three graphs. (See Figure 4-8 on page 4-10.) (See Figure 4-10 on
page 4-11.) As the duty cycle increases on the x-axis, the measurement time (of
the noncontinuous current) on the y-axis decreases.
The effect of measuring two different noncontinuous current amplitudes, 750 A
and 600 A respectively, with varying duty cycles and levels of continuous current
is illustrated. (See Figure 4-8 on page 4-10.) (See Figure 4-9 on page 4-10.) The
ambient temperature in these two examples is kept constant at 50 °C.
WARNING. To prevent injury, keep your hands away from the probe head until it
has had time to cool after disconnecting the probe from the circuit. Because when
using the probe near the upper current limit and maximum ambient temperature
for extended lengths of time, the probe head surface can become hot to the touch.
To see how noncontinuous current amplitude affects measurement time, look at
the curves for measurements of 200 A continuous between the two graphs. (See
Figure 4-8 on page 4-10.) (See Figure 4-9 on page 4-10.) Compare the maximum
measurement time allowed for a duty cycle of 20%: At 750 A, you have 3 minutes
of safe measurement time, versus 17 minutes for a smaller noncontinuous-current
amplitude of 600 A.
3–6
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Reference Notes
By looking at any of the three graphs, you can also see that when you measure
a noncontinuous current having the same amplitude and duty cycle, the
measurement time decreases as the continuous-current amplitude increases.
Finally, compare the two graphs. (See Figure 4-8 on page 4-10.) (See Figure 4-10
on page 4-11.) Here, the effect of ambient temperature on measurement time is
illustrated. Given a continuous current of 200 A with a noncontinuous current
of 750 A, and having a 20% duty cycle, a 27 °C increase in temperature yields a
12 minute decrease in maximum measurement time.
Keep these factors into account when taking measurements to ensure accuracy
and to protect both yourself from injury and the equipment from damage.
Extending Current Range
You may encounter situations where your measurement exceeds the maximum
current rating of the connected probe. This section discusses methods for
extending AC and DC current ranges without exceeding specified limits.
WARNING. To avoid personal injury or loss of life due to shock or fire, do
not exceed the specified electrical limits of the TCPA300 and TCPA400 or any
applicable accessories. When using multiple conductors, do not exceed current
limits on either conductor.
Extending DC Range
If you want to measure a low-amplitude AC component that is superimposed on
an extremely large steady state DC component (such as in a power supply), or
if you want to extend the DC current range of your probe, you can add offset
(bucking) current with a second conductor.
WARNING. To avoid injury or loss of life from shock or fire, do not put more than
one uninsulated conductor at a time in the probe jaws. An uninsulated conductor
is defined as any conductor without insulation or without insulation rated for the
voltage present on the conductor under test.
To supply additional bucking current, place a second conductor that has a pure
DC component of known value in the probe jaw with the conductor under test,
as shown in illustration (a). (See Figure 3-5 on page 3-8.) Orient the second
conductor so that the bucking current flows in the opposite direction of the DC
flow in the conductor under test.
You can increase the value of the bucking current by winding multiple turns of the
second conductor around the probe, as shown in illustration (b). (See Figure 3-5
on page 3-8.) The bucking current is equal to the current flowing in the conductor,
multiplied by the number of turns wound around the probe. For example, if the
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
3–7
Reference Notes
second conductor has a current of 100 mA DC and is wrapped around the probe
five times, the DC bucking current is 100 mA multiplied by 5, or 500 mA DC.
To determine measurement values, add the value of the bucking current to the
displayed measurement.
NOTE. Adding a second conductor to the probe increases the insertion impedance
and reduces the upper bandwidth limit of the probe. Winding multiple turns further
increases the insertion impedance, further reducing the upper bandwidth limit.
Figure 3-5: Increasing the DC measurement range
Extending AC Range
You can extend the AC amplitude limit of the TCPA300 by using the Tektronix
CT-4 High-Current Transformer. The CT-4, designed for use with the TCP305
and TCP312 current probes, extends the current probe range by a factor of 20:1
or 1000:1. The CT-4 can provide external steady-state DC bucking current up
to 300 A. For more information about the CT-4, consult your Tektronix sales
representative.
Because the CT-4 has a lower AC bandwidth limit than the TCP305 and TCP312
current probes, set the amplifier coupling to DC when using the CT-4.
Increasing Sensitivity
If you are measuring DC or low-frequency AC signals of very small amplitudes,
you can increase measurement sensitivity of your Current Probe by winding
several turns of the conductor under test around the probe as shown. The signal is
multiplied by the number of turns around the probe.
3–8
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Reference Notes
WARNING. To avoid injury or loss of life, do not put more than one uninsulated
conductor at a time in the probe jaws. An uninsulated conductor is defined as any
conductor without insulation or without insulation rated for the voltage present
on the conductor under test.
When viewing the signal on the oscilloscope screen, divide the displayed
amplitude by the number of turns to obtain the actual current value. For example,
if a conductor is wrapped around the probe five times and the oscilloscope shows
a reading of 5 mA DC, the actual current flow is 5 mA divided by 5, or 1 mA DC.
NOTE. Winding multiple turns around the probe increases insertion impedance
and reduces the upper bandwidth limit of the probe.
Figure 3-6: Increasing probe sensitivity
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
3–9
Application Notes
Application Notes
This section describes some of the typical measurement applications of the
TCPA300 and TCPA400 Current Probe Amplifiers:
Automobile Charging Systems
Inductance Measurements
Continuity Test of Multiple-Conductor Cable
Measuring Inductor Turns Count
Power Measurement and Analysis Software Applications
Automobile Charging Systems
Most automotive charging systems are three-phase alternators with a diode
rectifier network. A meter averages current from all three phases, and cannot
detect a single-phase diode problem. Observing the charge current waveform can
quickly reveal if one diode is shorted or open.
The equipment setup is available. (See Figure 3-7.) The test equipment setup
is available. (See Table 3-2.) A TCP303 Current Probe was used for this
high-current, low-voltage application. The TCP303 is degaussed and clamped
around the positive battery lead from the alternator. The probe arrow is pointed
away from the alternator and toward the battery side of the circuit, to reflect
conventional current. The automobile is started and the lights are turned on to add
a significant load to the circuit.
Table 3-2: Automobile charging systems test setup
Instrument
Control
Setting
TCPA300
COUPLING
DC
RANGE
50 A/V
Coupling
DC
Amps/Division
(Volts/Division if not using
TEKPROBE interface cable)
10 A/Div (200 mV/Div)
Zero-Current Reference
Center graticule line
Time Base
200 ms/division
Oscilloscope
3–10
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Application Notes
Figure 3-7: Setup for measuring charging current
The waveform (a) shows the three-phase ripple frequency. (See Figure 3-8.)
The average charge current is approximately 27 A with a minimum peak of
approximately 23 A and a maximum peak of approximately 31 A. The waveform
shows a continuous cycle with no dropouts, so the alternator circuit appears to be
functioning properly. A single-phase diode failure normally appears as an extreme
drop in charge current every third cycle, waveform (b). (See Figure 3-8.)
Figure 3-8: Charge current waveforms
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
3–11
Application Notes
Inductance Measurements
You can use the TCPA300 and TCPA400 to measure inductance of coils. Two
different methods can be used: one for low-impedance pulse sources and another
for high-impedance pulse sources of known value.
Low-Impedance Pulse
Sources
A measurement setup using a constant-voltage pulse generator of extremely low
output impedance is available. (See Figure 3-9.) The inductor is connected across
the output terminals of the pulse source. The current probe is attached to one of
the source leads and the current ramp is measured.
The inductance is effectively defined by the slope of the current ramp. (See
Figure 3-10 on page 3-13.) The inductance is mathematically expressed by the
following formula:
where L is the inductance in henries, E is the voltage of the pulse generator, dt is
the change in time, and di is the change in current.
Figure 3-9: Measuring inductance with a low-impedance source
NOTE. If the probe impedance is a significant part of the total circuit inductance,
measurement accuracy will be affected. Refer to the probe specifications for
probe insertion impedance.
3–12
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Application Notes
Figure 3-10: Linear current vs. time ramp
High-Impedance Pulse
Sources
If the pulse source has a higher impedance of known resistance, such that the
output voltage drops as the current increases, the inductance of a coil can
be calculated by the time constant of the charge curve. The setup diagram
is available, which is similar to the previous example. (See Figure 3-11 on
page 3-14.) The current ramp shows how the values for the inductance formula
are obtained. (See Figure 3-12 on page 3-14.)
Use this formula to calculate the inductance based on the current measurement:
where L is the inductance in henries, t is the time required for the current to rise or
fall 63.2% of the total current value, and R is the source resistance of the pulse
generator.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
3–13
Application Notes
Figure 3-11: Measuring inductance with a high-impedance source
Figure 3-12: High-impedance source current ramp
Continuity Test of Multiple-Conductor Cable
Single conductors in a multiconductor cable can be tested with the TCPA300 and
TCPA400. To check a conductor, clamp the current probe around the cable bundle
and check for a specific, known current signal. If there is no current or the current
is abnormally low, then the conductor has a continuity problem. If the current is
abnormally high, then the conductor may have a short to ground.
3–14
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Application Notes
Measuring Inductor Turns Count
To obtain an approximate turns count of an inductor, connect the inductor to a
current limited source. (See Figure 3-13 on page 3-15.) Measure the input current
on one of the inductor leads, then clamp the current probe around the inductor and
note the current value. The number of turns is equal to the ratio of coil current to
input current. The accuracy of this method is limited by the current measurement
accuracy. The following method allows more precise turns measurement.
For a more precise turns count, you need a coil with a known number of turns to
use as a reference. The measurement setup is similar to the previously described
one, except the reference coil and the test coil are inserted into the current probe
so that the currents oppose each other. (See Figure 3-14 on page 3-16.) You must
observe the polarity of coil current to determine whether the test coil has more or
fewer turns than the reference coil. The turns are calculated by using the formula:
where N2 is the number of turns in the test coil, N1 is the number of turns in the
reference coil, Im is the measured coil current, and I1 is the input current.
Figure 3-13: Measuring the number of turns in a coil
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
3–15
Application Notes
Figure 3-14: Turns measurement using reference coil
Power Measurement and Analysis Software
Power measurement software that is available for some Tektronix oscilloscopes
transform your current measurement system into a sophisticated analysis tool that
quickly measures and analyzes many different applications, such as:
Power dissipation at switching devices and magnetic components in switching
power supplies
Precompliance test for EN61000-3-2 standard
Power quality
Modulation analysis
After making the measurements, the software generates detailed test reports in
customizable formats. When the software is used with a Tektronix TDS5000
Series or TDS7054/TDS7104 digital phosphor oscilloscope and differential
voltage and current probes, it forms a complete measurement system for power
supply design and test.
3–16
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Troubleshooting and Error Codes
Troubleshooting and Error Codes
Possible problems that you may encounter when measuring current with the
TCPA300 and TCPA400 are available. (See Table 3-3.) Use this as a quick
troubleshooting reference.
Table 3-3: Troubleshooting
Problem
Remedy
Amplifier will not power on
Check that the amplifier is plugged into a working AC outlet.
Defective amplifier. Refer the instrument to qualified service personnel for repair or to
help determine which module is defective, a troubleshooting section is available. (See
page 7-20, Isolating Hardware Faults.)
Front panel displays an error status.
Error Status LEDs are on the lower-left
section of the amplifier front panel
Note the error status and correct the condition. The error status is labeled on the front
panel. For example, if the PROBE OPEN LED is lit, close and lock the probe jaws.
The AC and DC COUPLING LEDs are
flashing alternately
The Error Status LEDs are displaying an error code. Error codes descriptions are
available. (See Table 3-4 on page 3-20.) Note the error code and turn the instrument
off, then on. If the error condition persists, refer the instrument to qualified service
personnel for repair.
If the RANGE and DEGAUSS LED are both off, and one of the COUPLING LEDs is lit,
this indicates the amplifier is not detecting a probe. Reconnect the probe.
All LEDs flashing indicate a thermal shutdown. Power-cycle the system and let it cool for
15 minutes before taking measurements. In most cases, 15 minutes is sufficient.
All LEDs are flashing
All LEDs flashing indicates a thermal shutdown. Power-cycle the system and let it cool
before taking measurements. In most cases, 15 minutes is sufficient.
OVERLOAD LED remains lit red after
removing probe from circuit
Probe transformer or amplifier main board is defective.
OVERLOAD LED remains lit orange
Degauss the probe. If the OVERLOAD LED remains lit orange, disconnect the probe
from the circuit and let it cool for 15 minutes before degaussing again. If this does not
clear the LED, the probe transformer or probe Hall device may be defective. Connect
another probe to the amplifier, or connect the probe in question to another amplifier.
Probe does not degauss successfully
and LEDs are lighted in an unfamiliar
pattern
Amplifier is displaying an error code or is out of calibration or defective. (See Table 3-4
on page 3-20.) If another amplifier is available, try to degauss the probe on the other
amplifier, to help isolate the cause.
Component failure on probe circuit board: broken adjustment/wire/etc. Disassemble
probe, repair/replace component or refer the instrument to qualified service personnel
for repair.
Cannot degauss the probe
Current Probe is not locked. Lock the current probe.
Current Probe is improperly connected to the amplifier input connector.
Amplifier output is not terminated into 50 Ω load. Set input impedance of oscilloscope
to 50 Ω or connect a 50 Ω feed-through termination at the oscilloscope input, not at
the amplifier output.
Current Probe is defective or not compatible with the amplifier type.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
3–17
Troubleshooting and Error Codes
Table 3-3: Troubleshooting (cont.)
Problem
Remedy
Degauss takes longer than 10 seconds
Probe is attached to an energized circuit. Disconnect probe from circuit and retry.
Probe is faulty - Probe transformer (defective Hall device with excessive noise or drift)
may cause this symptom. May also be caused by a shorted or open wire in the probe
cable assembly.
Defective main board - If the probe is not the cause, then it is most likely a defective
main board in the amplifier.
Cannot make a current measurement no measurement output from amplifier
Current Probe is not locked. Lock the current probe.
Current Probe is improperly connected to the amplifier input connector.
Amplifier COUPLING is set to AC. Set the COUPLING to DC.
A Degauss/Autobalance routine has not been completed successfully on the system.
Degauss the probe.
Oscilloscope/Amplifier is not set to an appropriate sensitivity setting.
Defective interface cable (between oscilloscope and amplifier).
MANUAL BALANCE will not adjust
Oscilloscope or amplifier input coupling not set to DC. MANUAL BALANCE buttons only
function when the amplifier is in the DC coupling mode.
Oscilloscope/Amplifier is not set to an appropriate sensitivity setting.
Stray DC component in measurement
Degauss the probe using the PROBE DEGAUSS AUTOBALANCE button. (The Current
Probe has been overloaded, dropped, or exposed to magnetic field.)
You can use the MANUAL BALANCE buttons to null out any residual DC offset after
performing a Probe Degauss Autobalance routine.
Measurements are inaccurate
Degauss the probe.
The amplifier output is not terminated into 50 Ω load. Set the input impedance of
oscilloscope to 50 Ω or connect a 50 Ω feedthrough termination at the oscilloscope input.
Do not attach the termination at the amplifier output.
The measurement exceeds the maximum continuous current or Ampere-second product
ratings of the Current Probe. If possible, upgrade to a probe with a higher current rating
or use a CT-4 transformer. Amplifier or current probe out of calibration. (See page 5-1,
Performance Verification and Functional Checks.)
The jaw mechanism is dirty - disassemble probe, clean and lubricate. Probe disassembly
procedures are available. (See page 7-12, Probes.)
Defective current probe transformer.
Measurements roll off at high
frequencies
The oscilloscope bandwidth limit is turned on. Verify that the bandwidth limit switch on
the oscilloscope is set to the desired bandwidth position.
(Be careful not to exceed the frequency limit of the probe used. Frequencies above the
probe design may cause overheating and damage to the probe.)
Measurements exhibit excessive noise
Current Probe is not locked. Lock the current probe.
Current Probe is improperly connected to the amplifier input.
Amplifier output is not terminated into 50 Ω load. Set input impedance of oscilloscope
to 50 Ω or connect a 50 Ω feed-through termination at the oscilloscope input, not at
the amplifier output.
Defective current probe transformer.
3–18
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Troubleshooting and Error Codes
Table 3-3: Troubleshooting (cont.)
Problem
Remedy
Measurement aberrations exceed the
specified limit
The amplifier output is not terminated into 50 Ω load. Set the input impedance of the
oscilloscope to 50 Ω or connect a 50 Ω feedthrough termination at the oscilloscope input.
Do not attach the termination to amplifier output. (See page 8-2, Amplifier Replaceable
Parts.)
The measurement exceeds the maximum continuous current or Ampere-second product
ratings of the Current Probe. (Current limits are available) (See page 3-4, Maximum
Current Limits.) If possible, upgrade to a probe with a higher current rating or use a
CT-4 transformer.
Excessive low frequency droop in pulse
response or low DC gain accuracy
Check that the probe slider is fully closed and locked.
Check and clean the probe transformer and lid.
Degauss the probe.
The amplifier or the oscilloscope may be AC coupled. Set the COUPLING to DC.
Measurements exhibit excessive delay
or slowed pulse response
The amplifier output is not terminated into 50 Ω load. Set the input impedance of the
oscilloscope to 50 Ω or connect a 50 Ω feedthrough termination at the oscilloscope
input. Do not attach the termination to the amplifier output. (See page 8-2, Amplifier
Replaceable Parts.)
The measurement exceeds the Ampere-second product of the Current Probe. If possible,
upgrade to a probe with a higher current rating or use a CT-4 transformer.
The oscilloscope bandwidth limit is turned on. Verify that the bandwidth limit switch on
the oscilloscope is set to the desired bandwidth position.
Probe jaw not opening and closing freely
The jaw mechanism is dirty - disassemble probe, clean and lubricate. Probe disassembly
procedures are available. (See page 7-12, Probes.)
Displaying Error Codes with the Probe Degauss Autobalance Button
This section describes the error codes that the amplifiers display using the
function indicator LEDs.
When an internal error condition exists, the amplifiers may generate error codes
when you press the PROBE DEGAUSS AUTOBALANCE button. The AC and
DC Coupling LEDs will flash alternately to indicate that error codes are being
displayed instead of normal conditions.
The four fault indicator LEDs above the ON/STANDBY switch are used to form a
four-bit binary error code. The PROBE OPEN LED indicates the most significant
bit (MSB), and the NONCOMPATIBLE PROBE TYPE LED indicates the least
significant bit (LSB). (See Figure 3-15 on page 3-20.)
To continue past an error code, press any button except ON/STANDBY. However,
the degauss will fail until the internal error condition is corrected and the degauss
operation is run again.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
3–19
Troubleshooting and Error Codes
Figure 3-15: Error code display
For example, after you press the PROBE DEGAUSS AUTOBALANCE button, if
the AC and DC Coupling LEDs are flashing, and the NOT TERMINATED INTO
50 Ω LED is illuminated, this indicates an Error Code 2 - a null error in the DC
offset circuit occurred. (See Figure 3-16.)
Figure 3-16: Interpreting the error code display
A complete list of error codes for the amplifier is available.
Table 3-4: Amplifier error codes
3–20
Code Description of error
Action to take
1
Disconnect and reattach the probe to the amplifier.
Power cycle the amplifier. Check probe transformer
(defective Hall device). If these steps do not resolve the
error, the amplifier needs service. May also be caused
by a shorted or open wire in the probe cable assembly.
The amplifier detected
a probe, but a valid Hall
device was not detected.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Troubleshooting and Error Codes
Table 3-4: Amplifier error codes (cont.)
Code Description of error
Action to take
2
3
An error occurred while
nulling out the internal DC
offset of the amplifier.
Power cycle the amplifier and run the
Degauss/Autobalance adjustment routine again. If the
error reoccurs, then the amplifier needs service.
4
5
TCPA300 ONLY - An
error occurred while the
amplifier was adjusting
the power supply levels
for the different Range
settings.
Power cycle the amplifier and run the
Degauss/Autobalance adjustment routine again. If the
error reoccurs, then perform the following steps:
1) Remove the probe from the circuit.
2) Check probe - The signal path through the probe
transformer may be open or shorted, which can
be caused by defective probe transformer or cable
assembly. If the above steps do not resolve the error,
the amplifier needs service.
6
7
An error occurred
while the amplifier was
adjusting the Overload
trip points.
Power cycle the amplifier and run the
Degauss/Autobalance adjustment routine again. If the
error reoccurs, then remove the probe from the circuit.
If this does not resolve the error, the amplifier needs
service.
8
9
Unused
10
11
An error occurred while
nulling out the internal DC
offset of the amplifier.
Power cycle the amplifier and run the
Degauss/Autobalance adjustment routine again. If the
error reoccurs, then remove the probe from the circuit.
If this does not resolve the error, the amplifier needs
service.
12
13
14
The amplifier cannot null
out the probe DC offset
voltage.
Remove the probe from the circuit. Error 12 will
most likely occur when the probe is connected to an
energized circuit when a Degauss/Autobalance routine
is initiated. Check probe transformer (defective Hall
device).
This error may also be caused by a Hall device with
excessive noise or drift in the probe transformer,
or a shorted or open wire in the probe cable
assembly. Power cycle the amplifier and run the
Degauss/Autobalance adjustment routine again. If
these steps do not resolve the error, the amplifier needs
service.
15
Unspecified error (internal
software error)
Power cycle the amplifier and run the
Degauss/Autobalance adjustment routine again. If the
error reoccurs, then the amplifier needs service.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
3–21
Troubleshooting and Error Codes
Correcting the Cause of an Error Code
After interpreting the error code, disconnect the probe from the circuit and
degauss the probe again. Take the measurement again. If the error code persists,
contact your Tektronix Service Center.
Shutdown Error
If all LEDs flash at the same time, a shutdown condition exists. If this occurs, turn
off the amplifier and disconnect the probe from the circuit under test. Turning off
the amplifier clears the error register.
A shutdown condition can be caused by exceeding the frequency/current
specifications. Verify that you are not exceeding the specifications and let the
probe and amplifier cool before using them again. In most cases, 15 minutes is
sufficient. If the measurement you were taking was within the probe and amplifier
specifications, degauss the probe and take the measurement again. If the shutdown
error persists, contact your Tektronix Service Center.
3–22
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Specifications
Specifications
These specifications are valid only under the following conditions:
The probe and amplifier have been calibrated at an ambient temperature of
23 ° ±5 °C.
The probe and amplifier are operating within the environmental limits
described in Table 4-6 on page 4-5 (the operating temperature limits are 0 °C
to +50 °C, unless otherwise stated).
The probe and amplifier have had a warm-up period of at least 20 minutes.
The probe degauss/autobalance routine has been performed after the
20-minute warm-up period, and thereafter whenever the PROBE
DEGAUSS/AUTOBALANCE light blinks.
The amplifier output is properly terminated into 50 Ω.
Specifications are separated into two categories: warranted specifications and
nominal or typical characteristics.
Warranted Specifications
Warranted specifications, Table 4-1, are guaranteed performance specifications
unless specifically designated as typical or nominal.
Table 4-1: Warranted TCPA300 and TCPA400 specifications
Amplifier
TCPA300
TCPA400
DC Gain Accuracy
≤1%
≤1%
Installed probe
TCP312
TCP305
TCP303
TCP404XL
Bandwidth (-3 dB)
DC to 100 MHz
DC to 50 MHz
DC to 15 MHz
DC to 2 MHz
Rise Time, 10% to
90%
≤ 3.5 ns
≤ 7 ns
≤ 23 ns
≤ 175 ns
≤3%
≤3%
≤3%
≤1%
≤1%
≤1%
DC Gain Accuracy:
Warranted
Typical
2
1
Warranted from 10 °C to 50 °C. For temperature range of 0 °C to <10 °C, spec is +3%/-6%.
2
23 °C ±5 °C
1
≤3%
≤1%
Nominal and Typical Characteristics
Nominal and typical characteristics, listed in Table 4-2, are not guaranteed. They
are provided to characterize the configuration, performance, or operation of
typical probe/amplifier combinations.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
4–1
Specifications
Table 4-2: Nominal and typical amplifier characteristics
Installed probe
Parameter
TCP312
TCP305
TCP303
TCP404XL
Ranges, nominal
1 A/V,
10 A/V
5 A/V,
10 A/V
5 A/V,
50 A/V
1 A/mV
Maximum Amp-Second
Product – Frequency
deratings shown. (See
page 4-6, Performance
Graphs.)
1 A/V - 50 A· μs
10 A/V - 500 A· μs
5 A/V - 500 A· μs
10 A/V - NA
5 A/V - 3000 A· μs
50 A/V 15000 A· ms
NA
Input Coupling, nominal
AC, DC
AC, DC
AC, DC
AC, DC
AC Coupling Low- Frequency
Bandwidth, (low-pass -3 dB
point), typical
<7 Hz
<7 Hz
<7 Hz
<7 Hz
Displayed Noise, typical
≤75 mARMS Limit
measurement
bandwidth to
20 MHz.
≤500 mARMS Limit
measurement
bandwidth to
20 MHz.
≤500 mARMS Limit
measurement
bandwidth to
20 MHz.
≤70 mARMS Limit
measurement bandwidth
to 20 MHz.
Signal Delay, typical,
(includes probe,
amplifier, and
TEKPROBE-to-TEKPROBE
interface cable, or
012-0117-00 BNC cable)
approximately
17 ns
approximately
19 ns
approximately 53 ns
approximately 103 ns
Maximum Bare Wire Voltage
Use with insulated
wires only
Use with insulated
wires only
600 V RMS CAT
I & II 300 VRMS
CAT III
600 V RMS CAT I & II
300 VRMS CAT III
Lowest Measurable Current
1 mA
5 mA
5 mA
1A
Insertion Impedance – For
plots (See Figure 4-6.)
1 MHz: 0.08 Ω
1 MHz: 0.035 Ω
1 MHz: 0.01Ω
10 kHz: 0.1 mΩ
10 MHz: 0.15 Ω
10 MHz: 0.12 Ω
5 MHz: 0.025 Ω
100 kHz: 0.6 m Ω
50 MHz: 0.27 Ω
50 MHz: 0.04 Ω
15 MHz: 0.1 Ω
1 MHz: 8.0 m Ω
2 MHz: 16.0 mW
100 MHz: 0.7 Ω
Current Transfer Ratio
1 V/Amp and
100 mV/Amp
200 mV/Amp and
100 mV/Amp
200 mV/Amp and
20 mV/Amp
1 mV/Amp
10 A/V Range
10 A/V Range
50 A/V Range
1 A/mV Range
DC (continuous)
30 A
50 A
150 A
500 A
DC (noncontinuous)
N/A
N/A
N/A
750 A
RMS (sinusoidal)
21 A
35 A
150 A
500 A
Peak Pulse
50 A
50 A
500 A
750 A
Low Current Sensitivity
Range
1 A/V Range
5 A/V Range
5 A/V Range
N/A
DC (continuous)
5A
25 A
25 A
—
Maximum Current Ratings at Sensitivity Ranges
High Current Sensitivity
Range
4–2
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Specifications
Table 4-2: Nominal and typical amplifier characteristics (cont.)
Installed probe
Parameter
TCP312
TCP305
TCP303
DC (noncontinuous)
N/A
N/A
N/A
TCP404XL
—
RMS (sinusoidal)
3.5 A
17.7 A
17.7 A
—
Peak Pulse
50 A
50 A
500 A
—
Input Voltage
100-240 VAC (±10%), 47 Hz to 440 Hz, single phase
Maximum Power
50 Watts maximum
Fuse Rating
3.15 AH, 250 V (Not operator-replaceable.)
Mechanical Characteristics
Table 4-3: TCPA300 and TCPA400 mechanical characteristics
Parameter, nominal
Characteristic
Length
173 mm (6.8 in)
Width
91.4 mm (3.6 in)
Height
167 mm (6.6 in)
Weight
1.14 kg (2.5 lb)
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
4–3
Specifications
Mechanical characteristics of the probes are available.
Table 4-4: Probe mechanical characteristics
TCP305 and TCP312
TCP303 and TCP404XL
20 cm (7.77 inches)
1.6 cm (0.625 inches)
3.2 cm (1.25 inches)
268 mm (10.55 inches)
41 mm (1.60 inches)
68 mm (2.7 inches)
Cable length
1.5 m (5 feet)
TCP303: 2 m (6.6 feet)
TCP404XL: 8 m (26.25 feet)
Weight
0.15 kg (0.33 lb)
TCP303: 0.66 kg (1.45 lb)
TCP404XL: 0.88 kg (1.90 lb)
Probe dimensions
Length:
Width:
Height:
Figure 4-1: Probe jaw dimensions (nominal)
Table 4-5: Shipping weights and dimensions
TCPA300 and
TCPA400 Amplifiers
TCP305 and TCP312
TCP303
TCP404XL
Dimensions
Length:
298.5 mm
(11.75 inches)
330 mm (13.00 inches)
375 mm (14.75 inches)
375 mm (14.75 inches)
Width:
298.5 mm
(11.75 inches)
254 mm (10.00 inches)
318 mm (12.50 inches)
318 mm (12.50 inches)
Height:
254 mm (10.00 inches)
108 mm (4.25 inches)
127 mm (5.00 inches)
127 mm (5.00 inches)
2.7 kg (6.00 lb)
0.585 kg (1.29 lb)
1.33 kg (2.93 lb)
1.55 kg (3.42 lb)
Weight
4–4
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Specifications
Environmental Characteristics
The environmental characteristics are warranted performance specifications.
(See Table 4-6.)
Unlike the warranted characteristics, the environmental characteristics are type
tested; therefore there are no performance verification procedures provided to test
these characteristics. Unless otherwise noted, these characteristics apply to all
probes and amplifiers. (See page 4-1, Warranted Specifications.)
Table 4-6: Environmental characteristics
Parameter
Characteristic
Ambient Temperature
Operating
0 °C to +50 °C (32 °F to 122 °F)
Nonoperating
-40 °C to +75 °C (-40 °F to 167 °F)
Operating
5 to 95% R.H. to +30 °C (86 °F)
5 to 85% R.H. +30 °C to +50 °C (86 °F to 122 °F)
Nonoperating
5 to 95% R.H. to +30 °C (86 °F)
5 to 85% R.H. +30 °C to +75 °C (86 °F to 167 °F)
Operating
2000 m (6800 ft) maximum
Nonoperating
12,192 m (40,000 ft) maximum
Humidity
Altitude
Random Vibration, Amplifiers
Operating
0.31 gRMS, 5 Hz to 500 Hz, 10 minutes each axis
Nonoperating
2.46 gRMS, 5 Hz to 500 Hz, 10 minutes each axis
Random Vibration, Probes
Operating
2.66 gRMS, 5 Hz to 500 Hz, 10 minutes each axis
Nonoperating
3.48 gRMS, 5 Hz to 500 Hz, 10 minutes each axis
Shock, Amplifiers
50 g, 11 ms duration, half-sine pulses
Electro-Magnetic Compliance
Meets FCC Part 15, Subpart B, Class A
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
4–5
Specifications
Performance Graphs
Figure 4-2: Frequency derating-TCP312
Figure 4-3: Frequency derating-TCP305
4–6
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Specifications
Figure 4-4: Frequency derating-TCP303
Figure 4-5: Frequency derating-TCP404XL
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
4–7
Specifications
Figure 4-6: Insertion impedance graphs for the current probes
4–8
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Specifications
Figure 4-7: Specified operating area of the probes
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
4–9
Specifications
TCP404XL Maximum Measurement Times
Figures 4-8 through 4-10 show the maximum measurement time for the
TCP404XL probe, with varying duty cycles and temperatures. Details about
the relationship between measurement factors are available. (See page 3-5,
Measuring Noncontinuous Current with the TCP404XL Probe.)
Figure 4-8: Measuring 750A noncontinuous at 50 °C ambient temperature
Figure 4-9: Measuring 600A noncontinuous at 50 °C ambient temperature
4–10
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Specifications
Figure 4-10: Measuring 750A noncontinuous at 23 °C ambient temperature
At 23 degrees ambient temperature, 600 A can be measured continuously with
the TCP404XL probe.
Safety Compliance Information
Table 4-7: Safety compliance information
Category
Standards or description
EC Declaration of Conformity – Low
Voltage 1
Compliance was demonstrated to the following specification as listed in the Official Journal
of the European Communities:
Low Voltage Directive 73/23/EEC, amended by 93/68/EEC.
EN 61010-1/A2:1995. Safety requirements for electrical equipment for measurement
control and laboratory use.
EN 61010-2-032:1995. Particular requirements for hand-held current clamps for electrical
measurement and test equipment.
U.S. Nationally Recognized Testing
Laboratory Listing
UL3111-1. Standard for electrical measuring and test equipment.
UL3111–2–032. Standard for hand-held current clamps for electrical measurement and test.
Canadian Certification
CAN/CSA C22.2 No. 1010.1. Safety requirements for electrical equipment for
measurement, control, and laboratory use.
CAN/CSA C22.2 No. 1010.2.032:1996. Particular requirements for hand-held probe
assemblies for electrical measurement and test equipment.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
4–11
Specifications
Table 4-7: Safety compliance information (cont.)
Category
Standards or description
Additional Compliance
UL 61010B-1. Safety requirements for electrical equipment for measuring, controlling
and laboratory use.
IEC61010-1/A2:1995. Safety requirements for electrical equipment for measurement,
control, and laboratory use.
IEC 61010-2-032:1995. Particular requirements for hand-held current clamps for electrical
measurement and test.
IEC 61010-1:2001. Safety requirements for electrical equipment for measurement control
and laboratory use.
Installation (Overvoltage) Category
Descriptions
Terminals on this product may have different installation (overvoltage) category
designations. The installation categories are:
CAT III. Distribution-level mains (usually permanently connected). Equipment at this level is
typically in a fixed industrial location.
CAT II. Local-level mains (wall sockets). Equipment at this level includes appliances,
portable tools, and similar products. Equipment is usually cord-connected.
CAT I. Secondary (signal level) or battery operated circuits of electronic equipment.
Pollution Degree Descriptions
A measure of the contaminates that could occur in the environment around and within a
product. Typically the internal environment inside a product is considered to be the same
as the external. Products should be used only in the environment for which they are rated.
Pollution Degree 1. No pollution or only dry, nonconductive pollution occurs. Products in
this category are generally encapsulated, hermetically sealed, or located in clean rooms.
Pollution Degree 2. Normally only dry, nonconductive pollution occurs. Occasionally a
temporary conductivity that is caused by condensation must be expected. This location
is a typical office/home environment. Temporary condensation occurs only when the
product is out of service.
Pollution Degree 3. Conductive pollution, or dry, nonconductive pollution that becomes
conductive due to condensation. These are sheltered locations where neither temperature
nor humidity is controlled. The area is protected from direct sunshine, rain, or direct wind.
Pollution Degree 4. Pollution that generates persistent conductivity through conductive
dust, rain, or snow. Typical outdoor locations.
Equipment Type
Test and measuring
Safety Class
Class 1 (as defined in IEC 61010-1, Annex H) – grounded product
Overvoltage Category
Overvoltage Category II (as defined in IEC 61010-1, Annex J)
Pollution Degree
Pollution Degree 2 (as defined in IEC 61010-1). Note: Rated for indoor use only.
1
The TCP305 and TCP312 Current Probes are exempt from the Low Voltage Directive and are not third-party listed. However, they have been evaluated to
applicable safety standards.
4–12
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Performance Verification
Performance Verification Overview
The Performance Verification tests allow you to demonstrate that the Current Probe
Amplifier and Current Probes meet their specified levels of performance. Since
the TCPA300 and TCPA400 cannot operate without a current probe, a calibration
adapter is used to verify the amplifier(s) separately. The TCPA Calibration
Adapter is an optional accessory-see Replaceable Parts for part numbers. After
you have verified the amplifier performance independent of the current probe(s),
you can check the performance of current probes with confidence.
Tolerances that are specified in these procedures apply to the amplifiers and
current probes and do not include test equipment error. The recommended
calibration interval is one year.
Performance Verification and Functional Checks
The warranted specifications for the amplifiers that are checked in the performance
verification procedures are listed as shown. Warranted values are available.
Functional checks are included for you to verify proper amplifier operation.
Table 5-1: Amplifier checks
Amplifier
Performance verification
Functional checks
DC gain
accuracy
Front-panel
Bandwidth
AC coupling
Degauss
Overload 1
TCPA300
TCPA400
1
1 With probe attached
The warranted specifications for the probes that are checked in the performance
verification procedures are listed as shown. (See Table 5-2.) Warranted values are
available. (See Table 4-1 on page 4-1.)
Table 5-2: Probe performance verification checks
Probe
DC gain accuracy
Bandwidth
Risetime
TCP312
TCP305
TCP303
TCP404XL
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
5–1
Performance Verification Overview
Test Procedure Conditions
These procedures are valid only under the following conditions:
The system has been calibrated at an ambient temperature of 23 ° ±5 °C.
The system is operating in an environment whose limits are described. (See
Table 4-6 on page 4-5.)
The system, including probe, has had a warm-up period of at least 20 minutes.
The probe degauss/autobalance routine has been performed after the
20-minute warm-up period.
Equipment Preparation
Before performing the verification tests, turn all equipment on and allow the
entire system to warm up for a minimum of 20 minutes.
NOTE. Before performing any verification procedure, properly degauss the
probe. Remove the probe from any current-carrying conductor, lock the probe,
and press the amplifier PROBE DEGAUSS AUTOBALANCE button. The
degauss/autobalance routine is complete when the indicator light turns green.
The amplifier front panel will light the NOT TERMINATED INTO 50 Ω LED
during the degauss/ autobalance routine if the amplifier is not properly terminated
into 50 Ω. Verify that the oscilloscope input is 50 Ω and set to DC coupling. Use a
50 Ω feedthrough termination, attached at the oscilloscope input, if necessary.
5–2
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCPA300 and TCPA400 Performance Verification
TCPA300 and TCPA400 Performance Verification
This section covers the performance verification for the TCPA300 and TCPA400
Current Probe Amplifiers. Power on the amplifier and test equipment and let
them warm up for 20 minutes.
Before starting these procedures, photocopy the appropriate test record to record
the performance test results. The recommended calibration interval is one year.
(See page 5-17, TCPA300 Amplifier Test Record.)
Equipment Required
The performance verification procedures require the listed test equipment. The
test equipment must meet or exceed the specifications listed. You may need to
modify the test procedures if you do not use the recommended equipment.
Table 5-3: Required test equipment
Qty
Item
Description
Recommended
1
Oscilloscope
500 MHz bandwidth
Tektronix TDS5000
1
Leveled Sine Wave
Generator
3 MHz to 100 MHz
Wavetek 9100 with >250 MHz Oscilloscope Calibration
Option
1
Digital Multimeter
DCV: 0.1% Accuracy, 5½ digit
resolution
Keithley 2700
1
Current Source
DCA: 0.1% Accuracy, 0 to
±100 mA, floating outputs
Fluke 5100 or HP 6612C
1
Current Source
DCA: 0.1% accuracy, 0 to ±15 A
Wavetek 9100
1
Square Wave
Generator
ACV 1.5 Vp-p, 28 Hz square wave
Wavetek 9100
1
HF Current Loop
50 Ω , BNC Connector
Tektronix part number 015-0601-50
1
Precision
Termination
50 Ω ±0.1%, 0.5 W
Tektronix part number 011-0129-00
2
BNC Cables
50 Ω , 0.76 m (30 in) long
Tektronix part number 012-0117-00
1
Cable
TEKPROBE Interface Cable
Tektronix part number 012-1605-00
2
BNC to Dual Banana
Adapters
1
DC Current Loop
5 turns 18 AWG coated wire
Refer to page 5-4
1
DC Current Loop
50 turns 13 AWG coated wire
Refer to page 5-4
1
Calibration Adapter
TCPA Calibration Adapter
Tektronix part number 174-4765-00
TCPA300/400-compatible probe
Tektronix TCP303, 305, or 312 (TCPA300) or
TCP404XL (TCPA400)
1
1
Current Probe
1
Tektronix part number 103-0090-00
Required for functional test only.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
5–3
TCPA300 and TCPA400 Performance Verification
Making DC Current Loops
You need to construct simple current loops to complete some tests for the
amplifiers. The current loops are also used in the DC gain accuracy tests for
the probes.
5-Turn DC Current Loop
Construct the loop using a cylindrical form approximately 3 inches in diameter:
1. Wind exactly 5 turns of #18 coated wire around the form.
2. Scrape about a half-inch of coating off of the ends of the wire.
NOTE. Ensure that the current loop has exactly 5 turns. A significant error will
result for each turn variance from 5 turns.
The 5-turn DC current loop is also used in the current probe performance
verification and adjustment procedures.
50-Turn DC Current Loop
Construct the loop using a cylindrical form approximately 3 inches in diameter:
1. Wind exactly 50 turns of #13 coated wire around the form.
2. Scrape about a half-inch of coating off of the ends of the wire.
NOTE. Ensure that the current loop has exactly 50 turns. A significant error will
result for each turn variance from 50 turns.
The 50-turn DC current loop is also used in the current probe performance
verification procedures.
5–4
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCPA300 and TCPA400 Performance Verification
Front-Panel Display
The status and error LEDs on the front panel are illuminated briefly during the
amplifier power-on sequence. Verify that all LEDs are functional by doing the
following procedure:
1. Power-cycle the amplifier and check that the LEDs light briefly. Note that
the PROBE DEGAUSS AUTOBALANCE and OVERLOAD LEDs are
multi-color:
a. The PROBE DEGAUSS AUTOBALANCE LED lights in an orange
→red →green sequence.
b. The OVERLOAD LED lights in an orange →red →green sequence.
c. The MANUAL BALANCE LED is orange, and lights briefly.
d. The RANGE and COUPLING LEDs are green, and light briefly.
2. Record the results (pass/fail) on the test record.
Figure 5-1: Check LED functionality
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
5–5
TCPA300 and TCPA400 Performance Verification
DC Gain Accuracy
Use the following procedure to verify the DC gain accuracy of the amplifier.
Test Equipment Setup
Set up the test equipment as follows:
1. Connect the output of the amplifier to the DMM:
a. Connect a BNC cable from the amplifier OUTPUT to the 50 Ω precision
feedthrough termination.
b. Attach the termination to a BNC-to-dual banana adapter.
c. Observe polarity and insert the dual banana adapter into the digital
multimeter DC voltage input.
2. Connect the probe input to the current source:
a. Connect the BNC end of the Calibration Adapter to a BNC-to-dual banana
adapter.
b. Observe polarity and insert the dual banana adapter into the current source
DC output. Do not connect the Calibration Adapter to the amplifier at
this time.
Figure 5-2: Equipment setup for DC gain accuracy test
5–6
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCPA300 and TCPA400 Performance Verification
3. Make or verify the equipment settings as shown:
Table 5-4: Equipment settings
Digital multimeter
Measurement Type
DC volts
Range
Autoranging
Current source
Voltage
6V
Current
100 mA
Output
Off
TCPA300 and TCPA400 amplifier
Coupling
Procedure
DC
After the equipment is set up, proceed as follows:
4. Connect the Calibration Adapter to the PROBE INPUT of the amplifier.
5. Perform the following steps for each of the Range settings: (See Table 5-5.)
a. If you are checking a TCPA300, set the amplifier to the desired Range
setting. (See Table 5-5.)
b. Enable the output of the current source.
c. Record the exact measurement of the digital multimeter as M1.
Table 5-5: DC gain accuracy test for the TCPA300 and TCPA400
Amplifier
Range,
A/V
Current
source
output
Expected
output, VE
(VDC)
TCPA300
1
100 mA
5.0000
5
100 mA
2.5000
10
100 mA
1.2375
50
100 mA
0.4835
50
(COMP) 1
100 mA
0.4585
1 A/mV
100 mA
2.5000
TCPA400
1
Measured
output, M1
(VDC)
% Error,
calculated
Both 10 A/V and 50 A/V RANGE LEDs light.
d. Calculate the %Error between the measured output, M1, and the expected
output (VE) %Error as follows:
For example, using an expected output VE of 2.5000 V and a measured output M1
of 2.510, the %Error would be:
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
5–7
TCPA300 and TCPA400 Performance Verification
NOTE. It is important that the correct polarity be used to calculate the % Error.
6. Verify that the measured DC gain accuracy is within the limits specified
for all settings in the test record for the TCPA300. (See page 5-17,
TCPA300 Amplifier Test Record.) The TCPA400 test record is available. (See
page 5-18, TCPA400 Test Record.) Record the %Error in the test record.
NOTE. If the %Error on any of the settings is greater than the specified limit, you
must perform the adjustment procedure that begins on page 6-3.
7. Disconnect the DMM cable from the amplifier and the calibration adapter
from the current source.
Bandwidth
This procedure tests the bandwidth of the TCPA300 and TCPA400 amplifiers. In
this test you measure a signal at a relatively low frequency and again at the upper
test frequency. The two measurements are compared to verify that the signal
amplitude does not fall below a certain limit. Use the equipment connections
shown.
Figure 5-3: Bandwidth test setup
5–8
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCPA300 and TCPA400 Performance Verification
1. If you are using a Tektronix oscilloscope that supports the TekProbe Level 2
Interface, use the TekProbe interface cable to connect the amplifier OUTPUT
to the oscilloscope input. If you are not using a Tektronix oscilloscope that
supports the TekProbe Level 2 Interface, use a 50 Ω BNC cable. If the
input impedance of your oscilloscope is 1 M Ω, connect a 50 Ω feedthrough
termination at the oscilloscope input. Do not connect the termination at the
amplifier output.
2. Connect the Calibration Adapter to the amplifier PROBE INPUT.
3. Make or verify the equipment settings: (See Table 5-6 on page 5-10.)
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
5–9
TCPA300 and TCPA400 Performance Verification
Table 5-6: Equipment settings for bandwidth check
Oscilloscope
Vertical input impedance
Time base
50 W
TCPA300
TCPA400
Record length
40 ns/division
80 ns/division
500
Coupling
DC
Offset
0 V (mid-scale)
Trigger type
Edge
Trigger mode
Auto
Trigger position
50%
Acquisition mode
Average
Number of waveforms to
average
16
Measurement type
Peak-to-Peak
Leveled sine wave generator
Frequency
Amplitude
3 MHz
TCPA300
TCPA400
~3.0 Vp-p
1.0 Vp-p
Coupling
DC
TCPA300 and TCPA400
5–10
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCPA300 and TCPA400 Performance Verification
4. Connect the Calibration Adapter to the output of the leveled sine wave
generator.
5. Enable the output of the leveled sinewave generator.
6. Verify the amplifier output is what is listed for the TCPA300 amplifier.
(See Table 5-7 on page 5-12.) The TCPA400 amplifier output is available.
(See Table 5-8 on page 5-12.)
7. Using the peak-peak measurement capability of the oscilloscope, measure and
record the peak-peak reading as M1.
(See Table 5-7 on page 5-12.) (See Table 5-8 on page 5-12.)
8. If you are checking a TCPA300 perform the following steps. Each range
setting and bandwidth filter is available. (See Table 5-8 on page 5-12.)
Each range setting and bandwidth filter is available for the TCPA400.
(See Table 5-7 on page 5-12.)
a. Set the oscilloscope time base to 4 or 5 ns/division. Increase the signal
generator frequency to 50 or 100 MHz, depending on the range setting
and bandwidth.
b. When you check the 100 MHz frequency, press either MANUAL
BALANCE button until the orange MANUAL BALANCE LED lights.
This engages a higher-frequency filter in the amplifier. After you check
the bandwidth at 100 MHz, press either MANUAL BALANCE button
again to turn off the filter (the LED goes off.)
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
5–11
TCPA300 and TCPA400 Performance Verification
c. Using the peak-peak measurement capability of the oscilloscope, measure
and record the peak-peak reading as M2. (See Table 5-7 on page 5-12.)
(See Table 5-8 on page 5-12.)
9. The system meets the bandwidth specification if the ratio of the signal
amplitude at the warranted bandwidth is at least 70% of the signal amplitude
at 3 MHz. Using the following calculation, verify system bandwidth:
10. Verify that the calculated system bandwidth is within the limits specified
for all settings in the test record. (See page 5-17, TCPA300 Amplifier Test
Record.) (See page 5-18, TCPA400 Test Record.) Record the calculated
system bandwidth in the test record.
Table 5-7: TCPA300 bandwidth measurements
TEKPROBE interface
cable
Coaxial cable
Range
Vertical
gain
setting
Amplifier
output,
p-p
Vertical
gain
setting
Amplifier
output,
p-p
Bandwidth
filter and
generator
frequency
Correction
factor 1
1 A/V
500 mA/div
~3 A
500 mV/div
~3 V
50 MHz
1.09
500 mA/div
~3 A
500 mV/div
~3 V
100 MHz
1.14
1 A/div
~7.5 A
200 mV/div
~1.5 V
50 MHz
1.16
10 A/V
1 A/div
~7.5 A
100 mV/div
~0.75 V
50 MHz
1.11
50 A/V
2 A/div
~15 A
50 mV/div
~300 mV
50 MHz
1.14
50 A/V
COMP 2
2 A/div
~15 A
50 mV/div
~300 mV
50 MHz
1.00
5 A/V
1
2
M1
M2
1 The correction factor accounts for impedance differences between the 50 Ω voltage source and the TCPA amplifier at higher frequencies.
2 Both 10 A/V and 50 A/V RANGE LEDs light.
Use Table 5-8 to record the measurements for the TCPA400 Amplifier.
Table 5-8: TCPA400 bandwidth measurements
TEKPROBE interface
cable
Coaxial cable
Range
Vertical
gain
setting
Amplifier
output,
p-p
Vertical
gain
setting
Amplifier
output,
p-p
Bandwidth
filter and
generator
frequency
Correction
factor
1 A/mV
100 A/div
~500 A
100 mV/div
~500 mV
50 MHz
1.09
5–12
M1
M2
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCPA300 and TCPA400 Performance Verification
AC Coupling
The following test checks that the AC coupling circuit of the amplifier functions
properly. First, you measure a square-wave signal in DC coupling mode and record
the value, and then switch to AC coupling and measure the signal amplitude.
Figure 5-4: AC coupling test setup
To perform the check, do the following:
1. Connect the circuit as shown.
2. Set the amplifier COUPLING to DC.
3. If you are checking a TCPA300, set the RANGE to 1 A/V.
4. Set the generator to output a 28 Hz square wave.
5. Set the oscilloscope horizontal scale to 4 or 5 ms/div.
6. More equipment settings are available. (See Table 5-9 on page 5-14.)
7. Measure the signal on the oscilloscope and verify that it is 1Vp-p. If
necessary, adjust the generator output to achieve 1Vp-p.
8. Set the amplifier COUPLING to AC.
9. Measure the signal on the oscilloscope and verify that the signal is within
the limits on the test record.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
5–13
TCPA300 and TCPA400 Performance Verification
Table 5-9: TCPA300 and TCPA400 AC coupling measurements
TEKPROBE Interface cable
BNC coaxial cable
Square
wave
generator
Amplifier amplitude
Vertical
gain
setting
DC
coupled
amplifier
output
Minimum
AC
coupled
amplifier
output
Maximum
AC
coupled
amplifier
output
Vertical
gain
setting
DC
coupled
amplifier
output
Minimum
AC
coupled
amplifier
output
Maximum
AC
coupled
amplifier
output
TCPA300 0.5 Vp
200 mA/div 1.00 Ap-p
1.05 Ap-p
1.50 Ap-p
200 mV/div 1.00 Vp-p
1.05 Vp-p
1.50 Vp-p
TCPA400 0.5 Vp
200 A/div
1000 Ap-p
1050 Ap-p
1500 Ap-p
200 mV/div 1.00 Vp-p
1.05 Vp-p
1.50 Vp-p
1. Disconnect the Calibration Adapter from the amplifier.
Degauss
This is a functional test of the degauss operation. Setup equipment connections.
1. Connect a current probe to the output of the amplifier. Do not clamp the
current probe around any conductor, but make sure the jaws are locked shut.
2. Press the amplifier PROBE DEGAUSS AUTOBALANCE button. When the
indicator turns green, the degauss operation has successfully completed.
3. Verify that there are no error codes. Error codes display on the Probe Status
LEDs when the AC and DC COUPLING LEDs alternately flash.
4. Record the results (pass/fail) on the test record.
Figure 5-5: Setup for degaussing the current probe
5–14
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCPA300 and TCPA400 Performance Verification
Current Overload Test (TCPA300 Only)
This test checks the functionality of the TCPA300 current overload detection
circuit using the setup shown. You set the current source to output the maximum
rated current for the probe/amplifier you are testing, and then increase the current
source to a level that engages the overload circuit (the OVERLOAD LED is on).
Then, you repeat the test at the opposite polarity.
This test uses current loops that you make using wire and 3-inch forms.
Instructions on making current loops are available. (See page 5-4, Making DC
Current Loops.)
Figure 5-6: Overload test setup
1. Connect the circuit as shown. The correct current loop to use for the probe
you are testing is available. (See Table 5-10 on page 5-16.)
2. Set the RANGE on the amplifier to the highest setting for the probe that is
connected to the amplifier.
3. Adjust the current source output to the value for the probe you are testing.
(See Table 5-10 on page 5-16.) For example, if you are testing a TCP305,
adjust the output to 10 A.
4. Check that the OVERLOAD LED is off.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
5–15
TCPA300 and TCPA400 Performance Verification
Table 5-10: Maximum current ratings for TCPA300-compatible probes
Probe model
Range
Maximum
current
rating, Amps
TCP312
10 A/V
±30
5T
±6
TCP305
10 A/V
±50
5T
±10
50 A/V
±212 2
50 T
±4.24
TCP303
1
2
Current loop
used for test 1
Current
source
output, Amps
Refer to page 5-4 for instructions on making the current loops.
The TCP303 is a 150 A RMS probe with a peak current of 212 A. Apply current for only a short amount of time.
5. Slowly increase the output of the current source until the OVERLOAD LED
on the amplifier is on.
CAUTION. Do not leave the current turned up longer than necessary - damage to
the equipment or personal injury may result.
6. Decrease the output of the current source to zero.
7. Record the results (pass/fail) on the test record.
8. Repeat steps 3 through 7 for the opposite polarity.
This completes the performance verification for the amplifiers.
If the TCPA300 or TCPA400 amplifier fails any of the verification tests, refer to
the Adjustments section for servicing information.
5–16
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCPA300 and TCPA400 Performance Verification
TCPA300 Amplifier Test Record
Photocopy this form and use it to record the performance test results.
TCPA300 test record
Instrument Serial Number:
Certificate Number:
Temperature:
Relative Humidity %:
Date of Calibration:
Technician:
Performance test
Range, A/V
Front-Panel Display
Bandwidth
AC Coupling
Maximum
1
-1%
+1%
5
-1%
+1%
10
-1%
+1%
50
-1%
+1%
50 (COMP)
-1%
1
.707
+1%
——
1 (100 MHz)
.707
——
5
.707
——
10
.707
——
50
.707
——
50 (COMP)
.707
——
TEKPROBE
Cable
1
1.05 Ap-p
1.5 Ap-p
BNC Coax Cable
1
1.05 Vp-p
1.5 Vp-p
Degauss
Pass/Fail
Current Overload
Pass/Fail
1
Measured/calculated
Pass/Fail
DC Gain Accuracy
(% Error)
1
Minimum
The AC Coupling test can be performed with either cable, but the units of measure for the results differ between the two.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
5–17
TCPA300 and TCPA400 Performance Verification
TCPA400 Test Record
Photocopy this form and use it to record the performance test results.
TCPA400 test record
Instrument Serial Number:
Certificate Number:
Temperature:
Relative Humidity %:
Date of Calibration:
Technician:
Performance test
Minimum
Front-Panel Display
Pass/Fail
Measured/calculated
Maximum
DC Gain Accuracy (%
Error)
-1%
+1%
Bandwidth
0
.707
——
TEKPROBE Cable
1050 Ap-p
1500 Ap-p
BNC Coax Cable
1.05 Vp-p
1.5 Vp-p
AC Coupling
Degauss
1
1
Pass/Fail
The AC Coupling test can be performed with either cable, but the units of measure for the results differ between the two.
5–18
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCP305 and TCP312 Performance Verification
TCP305 and TCP312 Performance Verification
The test procedures in this section verify warranted specifications and
proper performance of the TCP305 and TCP312 current probes, using the
TCPA300 Amplifier. Tolerances that are specified in these procedures apply to the
amplifier and current probe and do not include test equipment error.
Before starting these procedures, photocopy the appropriate test record to record
the performance test results. (See page 5-30, TCP305 Current Probe Test Record.)
The recommended calibration interval is one year.
NOTE. If the amplifier is not properly terminated into 50 Ω, the NOT
TERMINATED INTO 50 W status LED is on. Verify that the 50 Ω termination is
connected at the DMM input when performing the following procedures.
No probe or amplifier adjustments are required during these test procedures. If
any tests fail, information is available. (See page 6-6, TCP305 and TCP312 DC
Gain Adjustment.)
WARNING. Magnetic fields are produced in these procedures that may cause a
malfunction in heart pacemakers or damage to sensitive equipment.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
5–19
TCP305 and TCP312 Performance Verification
Required Test Equipment
To perform the acceptance tests in this section, you will need the test equipment
listed. The test equipment must meet or exceed the specifications listed. The test
procedures may need to be modified if the recommended equipment is not used.
Table 5-11: Required test equipment
Qty
Item
Description
Recommended
1
Oscilloscope
500 MHz bandwidth
Tektronix TDS5000
1
Current Probe Amplifier
1
Leveled Sine Wave Generator
3 MHz to 100 MHz
Wavetek 9100 with Option 250
1
High Amplitude Pulse Generator
Rise time <1 ns, pulse width >100 ns
amplitude >5 Vp-p into 50 W
Picosecond Labs 2600
1
Digital Multimeter
DCV: 0.1% accuracy 51/2 digit
resolution
Keithley 2700
1
Current Source
DCA: 0.1% accuracy, 0 to ±10 A
Wavetek 9100
1
HF Current Loop
50 Ω , BNC Connector
Tektronix part number 015-0601-50
1
DC Current Loop
5 turns 18 AWG coated wire
Refer to page 5-4
1
Precision Termination
50 Ω ±0.1%, 0.5 W
Tektronix part number 011-0129-00
1
BNC Cable
50 Ω, 0.76 m (30 in) long
Tektronix part number 012-0117-00
1
Cable
TEKPROBE Interface Cable
Tektronix part number 012-1605-00
1
Adapter
BNC-to-Dual Banana
Tektronix part number 103-0090-00
5–20
Tektronix TCPA300
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCP305 and TCP312 Performance Verification
DC Gain Accuracy
This procedure tests the DC gain accuracy of the TCP305 and TCP312 Current
Probes. In this test you compare the voltage output of the amplifier to a reference
input.
This test uses current loops that you make using wire and 3-inch forms.
Instructions on making the current loops are available. (See page 5-4, Making
DC Current Loops.)
Equipment Connections
Using a BNC cable, connect the amplifier OUTPUT to the 50 Ω feedthrough
termination. Attach the termination to a BNC-to-dual banana adapter. Insert the
dual-banana adapter into the digital multimeter DC voltage input, taking care to
maintain polarity.
1. Connect the current loop to the current source as shown.
2. Connect the current probe to the PROBE INPUT connector. Do not connect
the probe to the current loop at this time.
Figure 5-7: DC gain accuracy test setup for TCP305 and TCP312
Equipment Settings
Make or verify the equipment settings in Table 5-12:
Table 5-12: Equipment settings for DC gain accuracy
Digital multimeter
Measurement Type
DC volts
Range
Autoranging
Current source
Amplitude
DC A
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
5–21
TCP305 and TCP312 Performance Verification
Table 5-12: Equipment settings for DC gain accuracy (cont.)
Output
Off
TCPA300
Coupling
5–22
DC
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCP305 and TCP312 Performance Verification
Procedure
1. Do not clamp the current probe around any conductor, but make sure the
jaws are locked shut.
2. Press the amplifier PROBE DEGAUSS AUTOBALANCE button. Wait for
the degauss/autobalance routine to complete before proceeding. The routine
is complete when the indicator light turns green.
3. Clamp the current probe around the 5 turn current loop, as shown. (See
Figure 5-7 on page 5-21.)
Observe and maintain proper polarity; the arrow-shaped indicator on the probe
points away from the (+) terminal of the current source.
4. Perform the following steps for each of the amplifier range settings: (See
Table 5-13 on page 5-23.)
a. Set the amplifier range to the first setting for the probe you are testing.
(See Table 5-13 on page 5-23.)
For example, if you are testing a TCP305, set the range to 5A/V.
b. Set the current source output to the first positive (+) setting for the probe
you are testing. (See Table 5-13 on page 5-23.) For example, if you are
testing a TCP305, set the output to +1.00 A. (Each output level is tested at
both polarities; later in the procedure, you will set the output to -1.00A.)
c. Enable the output of the current source.
d. Record the exact measurement of the digital multimeter as M1.
e. Set the current source output to the first negative (-) setting for the probe
you are testing.
(See Table 5-13 on page 5-23.) For example, if you are testing a TCP305,
set the output to -1.00 A.
f.
Record the exact measurement of the digital multimeter as M2.
Table 5-13: DC gain accuracy test for the TCP305 and TCP312
Probe
Range
Current
source
output (ADC)
TCP305
5 A/V
±1.00 A
10 A/V
Expected
output, VE
(VAC)
±1.00 V
±3.00 A
±3.00 V
±5.00 A
±5.00 V
±2.00 A
±1.00 V
±6.00 A
±3.00 V
±10.00 A
±5.00 V
M1 (VDC)
M2 (VDC)
M1-M2
(VDC)
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
% Error,
calculated
5–23
TCP305 and TCP312 Performance Verification
Table 5-13: DC gain accuracy test for the TCP305 and TCP312 (cont.)
Probe
Range
Current
source
output (ADC)
TCP312
1 A/V
±0.20 A
±1.00 V
±0.60 A
±3.00 V
±1.00 A
±5.00 V
±1.20 A
±0.60 V
±3.60 A
±1.80 V
±6.00 A
±3.00 V
10 A/V
Expected
output, VE
(VAC)
M1 (VDC)
M2 (VDC)
M1-M2
(VDC)
% Error,
calculated
g. Verify that the measured output (M1-M2) is within the warranted
specification listed, by computing %Error as follows: (See Table 4-1 on
page 4-1.)
For example, you may measure values of 0.990 V for M1 and -0.998 V for M2.
With an expected VE of 1.0 V, you compute the %Error as follows:
5. Record the results on the test record.
6. Disconnect the DMM cable from the amplifier and the probe from the 5T coil.
5–24
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCP305 and TCP312 Performance Verification
Rise Time
This procedure measures the rise time of the TCP305 and TCP312 Current Probes.
In this test you directly measure the rise time of a step input. Setup equipment
connections.
Figure 5-8: Rise time test setup for the TCP305 and TCP312
Equipment Connections
1. If you are using a Tektronix oscilloscope that supports the TekProbe Level 2
Interface, use the TekProbe Interface Cable to connect the amplifier OUTPUT
to the oscilloscope input. If you are not using a Tektronix oscilloscope that
supports the TekProbe Level 2 Interface, use a 50 Ω BNC cable. If the
input impedance of your oscilloscope is 1 MΩ, connect a 50 Ω feedthrough
termination at the oscilloscope input. Do not connect the termination at the
amplifier output.
2. Connect the current probe to the amplifier PROBE INPUT.
3. Connect the HF current loop to the high amplitude pulse generator output.
NOTE. If your oscilloscope cannot trigger on the pulse, use another BNC cable
to connect the trigger output of the pulse generator to the trigger input of the
oscilloscope. Configure the oscilloscope for an external trigger.
Equipment Settings
Make or verify the equipment settings: (See Table 5-13 on page 5-23.)
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
5–25
TCP305 and TCP312 Performance Verification
Table 5-14: Equipment settings for rise time
Oscilloscope
Vertical input
impedance
50 W
Vertical scale
200 mA/division
Time base
2 ns/division
Record length
500
Coupling
DC
Offset
0 V (mid-scale)
Trigger type
Edge
Trigger mode
Auto
Trigger position
50%
Acquisition mode
Average
Measurement type
32
Measurement type
Rise Time
High amplitude pulse generator
Amplitude
Maximum
TCPA300
Coupling
Range
Procedure
DC
TCP305
5 A/V
TCP312
1 A/V
1. Do not clamp the current probe around any conductor, but make sure the
jaws are locked shut.
2. Press the amplifier PROBE DEGAUSS AUTOBALANCE button. Wait for
the degauss/autobalance routine to complete before proceeding. The routine
is complete when the indicator light turns off.
3. Clamp the current probe around the HF current loop. Verify that the
arrow-shaped indicator on the probe points away from the pulse generator.
4. Adjust the vertical gain and vertical position of the oscilloscope so that 5 to
8 divisions are displayed. (You may have to adjust the pulse generator output
to achieve this.)
5. Using the measurement capability of the oscilloscope, measure the rise time
of the displayed pulse from 10% to 90% amplitude.
6. If the rise time of the pulse generator is greater than 1/4 of the rise time of the
probe you are testing, calculate the rise time of the probe (tr probe) using the
formula below:
5–26
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCP305 and TCP312 Performance Verification
The measured rise time (tr measured) is the value calculated in step 5.
The system rise time (tr system) is the rise time of the displayed signal when
output of the pulse generator is connected directly to the oscilloscope input. (The
current probe and amplifier are excluded.)
7. Verify that the probe rise time is less than the warranted specification listed
in the test record.
8. Record the results on the test record.
9. Disconnect the probe from the pulse generator.
Bandwidth
This procedure tests the bandwidth of the TCP305 and TCP312 Current Probes.
In this test you measure a signal at a relatively low frequency and again at the
rated bandwidth of the probe. The two measurements are compared to verify that
the signal amplitude does not fall below -3 dB at the probe bandwidth. Setup
equipment connections.
Figure 5-9: Bandwidth test setup for TCP305 and TCP312
Equipment Connections
1. If you are using a Tektronix oscilloscope that supports the TekProbe Level 2
Interface, use the TekProbe Interface Cable to connect the amplifier OUTPUT
to the oscilloscope input. If you are not using a Tektronix oscilloscope that
supports the TekProbe Level 2 Interface, use a 50 Ω BNC cable. If the
input impedance of your oscilloscope is 1 MΩ, connect a 50 Ω feedthrough
termination at the oscilloscope input. Do not connect the termination at the
2. Connect the current probe to the amplifier PROBE INPUT.
3. Connect the HF current loop to the output of the leveled sine wave generator.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
5–27
TCP305 and TCP312 Performance Verification
Equipment Settings
Make or verify the listed equipment settings.
Table 5-15: Equipment settings for bandwidth
Oscilloscope
Vertical input impedance
50 W
Time base
200 ns/division
Record length
500
Coupling
DC
Offset
0 V (mid-scale)
Trigger type
Edge
Trigger mode
Auto
Trigger position
50%
Acquisition mode
Average
Number of waveforms to average
8
Measurement type
Peak-to-Peak
Leveled sine wave generator
Frequency
3 MHz
Amplitude
3 Vp-p
Coupling
DC
TCPA300
Procedure
1. Do not clamp the current probe around any conductor, but make sure the
jaws are locked shut.
2. Press the amplifier PROBE DEGAUSS AUTOBALANCE button. Wait for
the degauss/autobalance routine to complete before proceeding. The routine
is complete when the indicator light turns green.
3. Clamp the current probe around the HF current loop.
4. Enable the output of the leveled sinewave generator.
5. Verify the output level is what is listed for the probe. (See Table 5-16 on
page 5-29.)
6. Using the peak-peak measurement capability of the oscilloscope, measure the
peak-peak reading and record it as M1. (See Table 5-16 on page 5-29.)
5–28
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCP305 and TCP312 Performance Verification
Table 5-16: Bandwidth test for the TCP305 and TCP312
Oscilloscope vertical gain
Probe
w/BNC
Range w/TEKPROBE cable
TCPA300 output
w/BNC
w/TEKPROBE cable
M1
@3 MHz
ref freq
BW
freq
TCP305 5 A/V
10 mA/div
2 mV/div
~60 mA p-p
~12 mV p-p
50 MHz
TCP312 1 A/V
10 mA/div
10 mV/div
~60 mA p-p
~60 mV p-p
100 MHz
1
M2
@warranted
BW
freq
Calculation 1
Use the formulas in step 9 on page 5-28.
7. Set the oscilloscope time base to 4 or 5 ns/division. Increase the signal
generator frequency to the warranted bandwidth. (See Table 4-1 on page 4-1.)
8. Using the peak-peak measurement capability of the oscilloscope, measure and
record the peak-peak reading as M2.
9. The probe meets the bandwidth specification if the ratio of the signal
amplitude at the warranted bandwidth is at least 70.7% of the signal amplitude
at 3 MHz. Using the following calculation, verify probe bandwidth for the
TCP305:
NOTE. The impedance of the HF current loop used in this test changes between
3 MHz and 100 MHz. Typically the impedance changes from 50 Ω at 3 MHz to
59 Ω at 100 MHz. Thus you can substitute the following equation to make this test
more accurate for the TCP312:
This completes the performance verification for the TCP305 and TCP312 probes.
If the TCP305 and TCP312 probes fail any of the verification tests, refer to the
Adjustments section for servicing information.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
5–29
TCP305 and TCP312 Performance Verification
TCP305 Current Probe Test Record
Photocopy this form and use it to record the performance test results.
TCP305 test record
Instrument Serial Number:
Certificate Number:
Temperature:
Relative Humidity %:
Date of Calibration:
Technician:
Performance test
DC Gain Accuracy
(% Error)
Range,
A/V
Test
Minimum
5 A/V
1.00 A
-3%
+3%
3.00 A
-3%
+3%
5.00 A
-3%
+3%
2.00 A
-3%
+3%
6.00 A
-3%
+3%
10.00 A
+3%
10 A/V
Rise Time
5 A/V
-3%
—
Bandwidth
5 A/V
0.707
5–30
Measured/calculated
Maximum
≤7 ns
——
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCP305 and TCP312 Performance Verification
TCP312 Current Probe Test Record
Photocopy this form and use it to record the performance test results.
TCP312 test record
Instrument Serial Number:
Certificate Number:
Temperature:
Relative Humidity %:
Date of Calibration:
Technician:
Performance test
DC Gain Accuracy (%
Error)
Range,
A/V
Test
Minimum
1 A/V
0.20 A
-3%
10 A/V
Measured/calculated
Maximum
+3%
0.60 A
-3%
+3%
1.00 A
-3%
+3%
1.20 A
-3%
+3%
3.60 A
-3%
+3%
6.00 A
-3%
+3%
≤3.5 ns
——
Rise Time
1 A/V
—
Bandwidth
1 A/V
.707
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
5–31
TCP303 and TCP404XL Performance Verification
TCP303 and TCP404XL Performance Verification
The test procedures in this section verify warranted specifications and proper
performance of the TCP303 and TCP404XL Current Probes, using the appropriate
amplifier. Tolerances that are specified in these procedures apply to the amplifier
and current probe and do not include test equipment error.
Before starting these procedures, photocopy the appropriate test record to record
the performance test results. The recommended calibration interval is one year.
(See page 5-43, TCP303 Current Probe Test Record.)
NOTE. If the amplifier is not properly terminated into 50 Ω, the NOT
TERMINATED INTO 50 W status LED is on. Verify that the 50 Ω termination is
connected at the DMM input when performing the following procedures.
No probe or amplifier adjustments are required during these test procedures. If
any tests fail, information is available. (See page 6-8, TCP303 and TCP404XL
Adjustments.)
WARNING. Magnetic fields are produced in these procedures that may cause a
malfunction in heart pacemakers or damage to sensitive equipment.
5–32
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCP303 and TCP404XL Performance Verification
Equipment Required
To perform the acceptance tests in this section, you will need the listed test
equipment. The test equipment must meet or exceed the specifications listed.
The test procedures may need to be modified if the recommended equipment is
not used.
Table 5-17: Required test equipment
Qty Item
Description
Recommended
1
Oscilloscope
100 MHz bandwidth
Tektronix TDS5000
1
High Amplitude Pulse Generator
(TCP303 only)
Rise time <5 ns, pulse width >100 ns
amplitude >20 Vp-p into 50 W
Picosecond Labs 2600
1
High Amplitude Pulse Generator
(TCP404XL only)
Square wave with a rise time <35 ns,
≥5 A into 50 W
AVTECH AVR-3-PW-C-P-TEK2
1
Leveled Sine Wave Generator (TCP303
only)
3 MHz to 20 MHz
Wavetek 9100 with Option 250
1
Current Source
DCA: 0.1% accuracy, 0 to ±15 A
Wavetek 9100
1
Digital Multimeter
DCV: 0.1% accuracy 51/2 digit resolution
Keithley 2700
1
Current Probe Amplifier
Use appropriate amplifier
Tektronix TCPA300 or TCPA400
1
BNC Cable
50 Ω, 0.76 m (30 in) long
Tektronix part number 012-0117-00
1
Cable
TEKPROBE Interface
Tektronix part number 012-1605-00
1
Adapter
BNC-to-Dual Banana
Tektronix part number 103-0090-00
1
HF Current Loop (TCP303 only)
50 Ω, BNC Connector
Tektronix part number 015-0601-50
1
DC Current Loop
50 turns 13 AWG coated wire
Refer to page 5-4
1
Precision Termination
50 Ω ±0.1%, 0.5 W
Tektronix part number 011-0129-00
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
5–33
TCP303 and TCP404XL Performance Verification
DC Gain Accuracy
This procedure tests the DC gain accuracy of the TCP303 and TCP404XL. In this
test you compare the voltage output of the amplifier to a reference input.
This test uses a 50-turn current loop that you make using wire and a 3-inch
form. Instructions on making a current loop is available. (See page 5-4, Making
DC Current Loops.)
Equipment Connections
Using a BNC cable, connect the amplifier OUTPUT to the 50 Ω feedthrough
termination. Attach the termination to a BNC-to-dual banana adapter. Insert the
dual-banana adapter into the digital multimeter DC voltage input, taking care to
maintain polarity.
1. Connect the current loop to the current source as shown.
2. Connect the current probe to the PROBE INPUT connector. Do not connect
the probe to the current loop at this time.
Figure 5-10: DC gain accuracy test setup for the TCP303 and TCP404XL
Equipment Settings
Make or check the equipment settings in Table 5-18.
Table 5-18: Equipment settings for DC gain accuracy
Digital multimeter
Measurement
DC volts
Range
Autoranging
Current source
Output
Off
TCPA300 and TCPA400
Coupling
5–34
DC
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCP303 and TCP404XL Performance Verification
Procedure
1. Do not clamp the current probe around any conductor, but make sure the
jaws are locked shut.
2. Press the amplifier PROBE DEGAUSS AUTOBALANCE button. Wait for
the degauss/autobalance routine to complete before proceeding. The routine
is complete when the indicator light turns green.
3. Clamp the current probe around the 50 turn current loop, as shown. (See
Figure 5-10 on page 5-34.) Maintain proper polarity; the arrow-shaped
indicator on the probe points away from the (+) terminal of the current source.
4. For each of the amplifier range settings, perform the following steps: (See
Table 5-19 on page 5-36.)
a. If you are testing a TCP303, set the amplifier range to the first setting for
that probe. (See Table 5-19 on page 5-36.) For example, set the range
to 5A/V.
b. Set the current source output to the first positive (+) setting for the probe
you are testing. (See Table 5-19 on page 5-36.) For example, if you are
testing a TCP303, set the output to +0.100 A. (Each output level is tested at
both polarities; later in the procedure, you will set the output to -0.100 A.)
c. Enable the output of the current source.
d. Record the exact measurement of the digital multimeter as M1.
e. Set the current source output to the first negative (-) setting for the probe
you are testing. (See Table 5-19 on page 5-36.) For example, if you are
testing a TCP303, set the output to -0.100 A.
f.
Record the exact measurement of the digital multimeter as M2.
g. Verify that the measured output (M1-M2) is within the warranted
specification listed, by computing %Error as follows: (See Table 4-1 on
page 4-1.)
For example, you may measure values of 0.990V for M1 and -0.998V for M2.
With an expected VE of 1.0 V, you compute the %Error as follows:
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
5–35
TCP303 and TCP404XL Performance Verification
5. Record the results on the test record.
Table 5-19: DC gain accuracy test worksheet for the TCP303 and TCP404XL
Probe
Range
Current
source
output
(ADC)
TCP303
5 A/V
±0.100 A
50 A/V
TCP404XL 1 A/mV
Expected output, VE
(VAC)
±1.00 V
±0.300 A
±3.00 V
±0.500 A
±5.00 V
±0.600 A
±0.600 V
±1.80 A
±1.80 V
±3.00 A
±3.00 V
±3.00 A
±0.150 V
±9.00 A
±0.450 V
±15.00 A
±0.750 V
M1 (VDC)
M2 (VDC)
M1-M2
(VDC)
% Error,
calculated
6. Disconnect the DMM cable from the amplifier and the probe from the 50T
coil.
5–36
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCP303 and TCP404XL Performance Verification
Rise Time
This procedure measures the rise time of the TCP303 and TCP404XL Probes.
In this test you directly measure the rise time of a step input. Setup equipment
connections.
Figure 5-11: Rise time test setup for the TCP303 and TCP404XL
Equipment Connections
1. If you are using a Tektronix oscilloscope that supports the TekProbe Level 2
Interface, use the TekProbe Interface Cable to connect the amplifier OUTPUT
to the oscilloscope input. If you are not using a Tektronix oscilloscope that
supports the TekProbe Level 2 Interface, use a 50 Ω BNC cable. If the
input impedance of your oscilloscope is 1 MΩ, connect a 50 Ω feedthrough
termination at the oscilloscope input. Do not connect the termination at the
50 Ω feedthrough termination at the oscilloscope input. Do not connect the
termination at the termination at the amplifier output.
2. Connect the current probe to the amplifier PROBE INPUT connector.
3. If testing a TCP303, connect the HF current loop to the high amplitude pulse
generator.
NOTE. If your oscilloscope cannot trigger on the pulse, use another BNC cable
to connect the trigger output of the pulse generator to the trigger input of the
oscilloscope. Configure the oscilloscope for an external trigger.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
5–37
TCP303 and TCP404XL Performance Verification
Equipment Settings
Make or verify the equipment settings in Table 5-20:
Table 5-20: Equipment settings for rise time
Oscilloscope
Vertical scale:
TCP303
TCP404XL
200 mA/division
1 A/division
Vertical input impedance
50 W
Time base:
10 ns/division
80 ns/division
TCP303
TCP404XL
Record length
500
Coupling
DC
20 MHz BW
limit:
TCP303
TCP404XL
Off
On
Offset
0 V (mid-scale)
Trigger type
Edge
Trigger mode
Auto
Trigger position
50%
Acquisition mode
Average
Number of waveforms to average
32
Measurement type
Rise Time
High amplitude pulse generator (TCP303)
Amplitude
Maximum
High amplitude pulse generator (TCP404XL)
Pulse width
250 ms
Pulse repetition frequency
10 Hz
Amplitude
5A
TCPA300 and TCPA400
5–38
Coupling
DC
Range TCP303
5 A/V
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCP303 and TCP404XL Performance Verification
Procedure
1. Do not clamp the current probe around any conductor, but make sure the
jaws are locked shut.
2. Press the amplifier PROBE DEGAUSS AUTOBALANCE button. Wait for
the degauss/autobalance routine to complete before proceeding. The routine
is complete when the indicator light turns green.
3. Make the following connections:
a. If you are testing a TCP303, clamp the current probe around the HF
current loop. Verify that the arrow-shaped indicator on the probe points
away from the pulse generator.
b. If you are testing a TCP404XL, clamp the current probe around the built-in
current loop on the pulse generator. Verify that the arrow-shaped indicator
on the probe points away from the output terminal on the pulse generator.
4. Adjust the vertical gain and set the vertical position of the oscilloscope so that
the trace is at the bottom of the screen, and 5 to 8 divisions are displayed.
Press LEVEL to trigger the oscilloscope. (You may have to adjust the pulse
generator output to achieve this.)
5. Using the measurement capability of the oscilloscope, measure the rise time
of the displayed pulse from 10% to 90% amplitude.
6. Check that the rise time is less than the warranted specification listed in the
test record.
7. Record the results on the test record.
8. Disconnect the probe from the pulse generator.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
5–39
TCP303 and TCP404XL Performance Verification
Bandwidth (TCP303)
This procedure tests the bandwidth of the TCP303 Current Probe. In this test you
measure a signal at a relatively low frequency and again at the rated bandwidth of
the probe. The two measurements are compared to verify that the signal amplitude
does not fall below -3 dB at the probe bandwidth. Setup equipment connections.
Figure 5-12: Bandwidth test setup for TCP303
Equipment Connections
1. If you are using a Tektronix oscilloscope that supports the TekProbe Level 2
Interface, use the TekProbe Interface Cable to connect the amplifier OUTPUT
to the oscilloscope input. If you are not using a Tektronix oscilloscope that
supports the TekProbe Level 2 Interface, use a 50 Ω BNC cable. If the
input impedance of your oscilloscope is 1 MΩ, connect a 50 Ω feedthrough
termination at the oscilloscope input. Do not connect the termination at the
amplifier output.
2. Connect the current probe to the amplifier PROBE INPUT.
3. Connect the HF current loop to the output of the leveled sine wave generator.
5–40
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCP303 and TCP404XL Performance Verification
Equipment Settings
Make or verify the equipment settings in Table 5-21.
Table 5-21: Equipment settings for bandwidth
Oscilloscope
Vertical input impedance
50 W
Time base
200 ns/division
Record length
500
Coupling
DC
Offset
0 V (mid-scale)
Trigger type
Edge
Trigger mode
Auto
Trigger position
50%
Acquisition mode
Average
Number of waveforms to average
8
Measurement type
Peak-to-Peak
Leveled sine wave generator
Frequency
3 MHz
Amplitude
3 Vp-p
TCPA300
Procedure
Coupling
DC
Range
5 A/V
1. Do not clamp the current probe around any conductor, but make sure the
jaws are locked shut.
2. Press the amplifier PROBE DEGAUSS AUTOBALANCE button. Wait for
the degauss/autobalance routine to complete before proceeding. The routine
is complete when the indicator light turns green.
3. Clamp the current probe around the HF current loop.
4. Enable the output of the leveled sinewave generator.
5. Verify the output level is what is listed for the probe. (See Table 5-22 on
page 5-42.)
6. Using the peak-peak measurement capability of the oscilloscope, measure and
record the peak-peak reading as M1. (See Table 5-22 on page 5-42.)
7. Set the oscilloscope time base to 40 or 50 ns/division. Increase the signal
generator frequency to the warranted bandwidth. Refer to the test record
for the warranted bandwidth.
8. Using the peak-peak measurement capability of the oscilloscope, measure and
record the peak-peak reading as M2
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
5–41
TCP303 and TCP404XL Performance Verification
Table 5-22: Bandwidth test for the TCP303
TEKPROBE cable
BNC cable
Oscilloscope
Probe Range vertical Gain
TCPA300
output
Oscilloscope
vertical
TCPA300
gain
output
TCP3035 A/V
~60 mA p-p
2 mV/div
1
10 mA/div
M1 @3 MHz ref
freq
M2 @
warranted BW
freq (15 MHz)
Calculation 1
~12 mV
p-p
Use the formula in step 9 below.
9. The probe meets the bandwidth specification if the ratio of the signal
amplitude at the warranted bandwidth is at least 70.7% of the signal amplitude
at 3 MHz. Using the following calculation, verify probe bandwidth:
10. Record the results on the test record.
Bandwidth (TCP404XL)
The bandwidth of the probe is derived as a function of the probe rise time. The
rise time (tr ) is measured in nanoseconds between the 10% and 90% points of
the leading edge of the pulse. (See page 5-25, Rise Time.) To calculate the probe
bandwidth, use the following formula:
For example, a rise time of 175 ns would result in the following solution:
1. Record the results on the test record.
This completes the performance verification for the TCP303 and TCP404XL
probes.
If the TCP303 or TCP404XL probes fail any of the verification tests, servicing
information is available. (See page 6-1, Adjustment Procedures Overview.)
5–42
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCP303 and TCP404XL Performance Verification
TCP303 Current Probe Test Record
Photocopy this form and use it to record the performance test results.
TCP303 test record
Instrument Serial Number:
Certificate Number:
Temperature:
Relative Humidity %:
Date of Calibration:
Technician:
Performance test
1
DC Gain Accuracy (% Error)
Range, A/V
Test
Minimum
5 A/V
1
-3%
+3%
3
-3%
+3%
5
-3%
+3%
0.6
-3%
+3%
1.8
-3%
+3%
-3%
—
+3%
.707
50 A/V
Rise Time
5 A/V
3.0
—
Bandwidth
5 A/V
—
1
Measured/calculated
Maximum
23 ns
——
DC Gain Accuracy is tested at the 10 °C to 50 °C specification. If you need to test the probe at 0 °C to 10 °C, refer to the specification limits on page 4-1.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
5–43
TCP303 and TCP404XL Performance Verification
TCP404XL Current Probe Test Record
Photocopy this form and use it to record the performance test results.
TCP404XL test record
Instrument Serial Number:
Certificate Number:
Temperature:
Relative Humidity %:
Date of Calibration:
Technician:
Performance test
Range
Test
Minimum
DC Gain Accuracy (% Error)
1 A/mV
3.0 A
-3%
+3%
9.0 A
-3%
+3%
-3%
—
+3%
2 MHz
Rise Time
1 A/mV
15.0 A
—
Bandwidth
1 A/mV
—
5–44
Measured/calculated
Maximum
175 ns
——
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Adjustment Procedures
Adjustment Procedures Overview
The following procedures describe adjustments to the current probes and
amplifiers. Before performing the adjustment procedures, do the following:
1. If you are adjusting an amplifier, remove the outer case to gain access to
the adjustments. (See page 7-2, Disassembly.) Next, attach the calibration
adapter to the amplifier.
2. If you are adjusting a probe, attach the current probe to the amplifier.
3. Turn the power on and allow the entire system to warm up for a minimum
of 20 minutes. Warm up any test equipment that is listed at the beginning
of the procedure used.
The recommended calibration interval is one year.
Adjustment information you can make to the amplifiers and probes is available.
(See Table 6-1.)
Table 6-1: Amplifier and probe adjustments
Adjustments
Device
DC gain accuracy
Low frequency
High frequency
Amplifiers
TCPA300
(4 adjustments)
TCPA400
Probes
TCP312
TCP305
TCP303
TCP404XL
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
6–1
TCPA300 and TCPA400 Amplifier Adjustments
TCPA300 and TCPA400 Amplifier Adjustments
This section covers the adjustments for the TCPA300 and TCPA400 Current
Probe Amplifiers. The list of equipment required is available. (See Table 6-2.)
Required Test Equipment
The adjustment procedures require the test equipment listed. (See Table 6-2.) The
test equipment must meet or exceed the specifications listed. You may need to
modify the test procedures if you do not use the recommended equipment.
Table 6-2: Required test equipment
Qty
Item
Description
Recommended
1
Digital Multimeter
0.20%, 31/2 digit resolution, range ±50 mV
Keithley 2700
1
Current Source
0.1%, 0 to ±100 mA
Fluke 5100 A or HP 6612C
1
Termination
50 Ω ±0.1%, 0.5 W
Tektronix part number 011-0129-00
2
BNC Cables
50 Ω , 1.05 m (42 in) long
Tektronix part number 012-0117-00
1
Cables
TEKPROBE Interface
Tektronix part number 012-1605-00
2
Adapters
BNC-to-Dual Banana Adapters
Tektronix part number 103-0090-00
1
Calibration Adapter
TCPA Calibration Adapter
Tektronix part number 174-4765-00
1
Adjustment tool
1/8-inch flat-blade
Tektronix part number 003-0675-01
Accessing the Adjustments
To gain access to the amplifier adjustments, you must remove the outer case.
There are access ports in the right-side internal cover, but you can also remove the
internal cover to get a better view of the adjustments. (See page 7-2, Disassembly.)
After completing the disassembly procedure, power on the amplifier and test
equipment and let them warm up for at least 20 minutes.
6–2
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCPA300 and TCPA400 Amplifier Adjustments
TCPA300 Amplifier
The TCPA300 has four internal adjustments that affect the gain of the amplifier.
(The TCPA400 has one adjustment.) Each range has an individual control, except
the 1 A/V range, which does not have an adjustment. To make adjustments to
the amplifier, do the following:
1. Set up the circuit shown.
Figure 6-1: Amplifier adjustments
2. Set the current source to the values shown and adjust the corresponding
adjustment pot to the target values shown. (See Table 6-3.) Information is
available to locate the adjustments on the amplifier board. (See Table 6-2
on page 6-2.)
Table 6-3: TCPA300 gain adjustments
Adjustment
Minimum
output,
VDC
Expected output,
VDC
Maximum output, VDC
0.100
No adjustment
4.9900
5.0000
5.0100
5
0.100
25 W
2.4950
2.5000
2.5050
10
0.100
12.5 W
1.2350
1.2375
1.2400
50
0.100
5W
0.4825
0.4835
0.4845
50 COMP 1
0.100
5 Ω COMP
0.4576
0.4585
0.4594
Range, A/V
Current source
value, ADC
1
1
Both 10 A/V and 50 A/V LEDs light.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
6–3
TCPA300 and TCPA400 Amplifier Adjustments
Figure 6-2: Gain adjustment locations
TCPA400 Amplifier
The TCPA400 has one internal gain adjustment in the amplifier. To make
adjustments to the amplifier, do the following:
1. Set up the circuit shown. (See Figure 6-1 on page 6-3.)
2. Set the current source to the value shown and adjust the corresponding
adjustment pot to within the limits shown. (See Table 6-4.) Information is
available to locate the adjustment on the amplifier board. (See Figure 6-2.)
Table 6-4: TCPA400 gain adjustments
Range, A/mV
Current source
value, DC A
Adjustment
Minimum output,
VDC
Expected output,
VDC
Maximum
output, VDC
1
0.100
25 W
2.4938
2.5000
2.5063
This completes the adjustments for the amplifiers. Do the appropriate performance
verification for the amplifier to verify that it meets the warranted specifications.
6–4
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCP305 and TCP312 Adjustments
TCP305 and TCP312 Adjustments
The TCP305 and TCP312 Current Probes have one characteristic that is
adjustable-DC gain. The following text describes the DC gain adjustment
procedure. Tolerances that are specified in these procedures apply to the current
probes and do not include test equipment error.
Required Test Equipment
To perform the adjustment procedure in this section, you will need the test
equipment listed. (See Table 6-5.) The test equipment must meet or exceed
the specifications listed. The test procedure may need to be changed if the
recommended equipment is not used.
Table 6-5: Required test equipment
Qty Item
Description
Recommended
1
AC Current Source
ACA: 0.25% accuracy, 0 to ±1.5 A, square wave
output
Wavetek 9100
1
Digital Multimeter
ACV: <0.1% accuracy 51/2 digit resolution
Keithley 2700
1
Termination
50 W, 0.1% precision, BNC connector, feedthrough
Tektronix part number 011-0129-00
50 Ω , 0.76 m (30 in) long
Tektronix part number 012-0117-00
1
BNC
1
Adapter
BNC to Dual Banana
Tektronix part number 103-0090-00
1
DC Current Loop
5 turns 18 AWG coated wire
(See page 5-4, Making DC Current Loops.)
1
Cable 1
Provided as a standard accessory with the TCPA300.
Accessing the Adjustments
The location of the DC gain adjustment in the lower probe half is shown. (See
Figure 6-3.)
Figure 6-3: TCP305 and TCP312 DC gain adjustment location
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
6–5
TCP305 and TCP312 Adjustments
TCP305 and TCP312 DC Gain Adjustment
Use the following procedure to adjust the DC Gain of the TCP305 and TCP312
Probes.
Equipment Connections
1. Connect the amplifier OUTPUT to the DMM input using a BNC-to-Dual
Banana connector, 50 Ω BNC cable, and a 50 Ω precision feedthrough
termination. Do not connect the termination at the amplifier output.
2. Connect the current probe to the amplifier PROBE INPUT connector.
3. Connect the 5-turn DC current loop to the current source as shown. (See
page 5-4, Making DC Current Loops.)
4. Do not clamp the current probe around any conductor, but make sure the
slide is locked.
Equipment Settings
Make or verify the equipment settings: (See Table 6-6.)
Table 6-6: Settings for DC gain adjustment
Digital multimeter
Measurement Type
AC volts
Range
Autoranging
Current source
Output waveshape/frequency
Square wave, 40 Hz
Output
Off
TCPA300
6–6
Coupling
DC
Range: TCP305
5 A/V
TCP312
1 A/V
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCP305 and TCP312 Adjustments
Figure 6-4: DC gain adjustment setup for TCP305 and TCP312
Procedure
1. Press the amplifier PROBE DEGAUSS AUTOBALANCE button. Wait for
the degauss/autobalance routine to complete before proceeding. The routine
is complete when the indicator light turns green.
2. Connect the current probe to the DC current loop.
3. Perform the following steps: (See Table 6-7.)
a. Set the amplifier to the appropriate range setting for the probe you are
testing.
b. Set the current source output to the correct current level.
c. Enable the output of the current source.
d. Adjust the DC gain control on the probe to the expected output value
shown. (See Table 6-7.)
Table 6-7: DC gain accuracy adjustments for the TCP305 and TCP312
Probe
Range
Current
source
output (mA
pk)
TCP305
5 A/V
300 mA
0.3000
0.2990
0.3011
TCP312
1
A/V
60 mA
0.3008
0.2997
0.3018
Expected
output, VE
(VAC)
Minimum
output, VAC
Maximum
output, VAC
This completes the adjustments for the TCP305 and TCP312 Current Probes. Do
the appropriate performance verification procedure for the probe you adjusted,
using these procedures. (See page 5-19, TCP305 and TCP312 Performance
Verification.)
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
6–7
TCP303 and TCP404XL Adjustments
TCP303 and TCP404XL Adjustments
Each of the following adjustment procedures describes how to adjust specific
performance characteristics of the TCP303 and TCP404XL. Tolerances that are
specified in these procedures apply to the current probe and do not include test
equipment error.
Required Test Equipment
To perform the adjustment procedures in this section, you will need the test
equipment listed. (See Table 6-8.) The test equipment must meet or exceed the
specifications listed. You may need to modify the test procedures if you do not
use the recommended equipment.
Perform these steps before starting these procedures. (See Table 6-1 on page 6-1.)
To ensure proper completion, read each procedure before starting.
Table 6-8: Required test equipment
Qty
Item
Description
Recommended example
1
Oscilloscope
100 MHz bandwidth
Tektronix TDS5000
1
High Amplitude Pulse
Generator (TCP404XL
only)
Square wave with a rise time <35 ns, ≥5 A into
50 W
AVTECH AVR-3-PW-C-P-TEK2
1
Current Probe
Amplifier
1
AC Current Source
AC A: 0.25% accuracy, 0 to ±5 A, square wave
output, 40 Hz-1 kHz, tR <10 ms
Wavetek 9100
1
Digital Multimeter
AC V: ≤ 0.1% accuracy, 51/2 digit resolution
Keithley 2700
1
Cable
TEKPROBE Interface
Tektronix part number 012-1605-00
Tektronix TCPA300 (TCP303) or TCPA400
(TCP404XL)
1
BNC Cable (TCP303
only)
50 Ω , 0.76 m (30 in) long
Tektronix part number 012-0117-00
1
Cable
Banana plugs at ends, 18 inches
Tektronix part number 012-0031-00
1
Adapter
BNC to Dual Banana
Tektronix part number 103-0090-00
1
Termination
50 Ω ±0.1%, 0.5 W
Tektronix part number 011-0129-00
1
DC Current Loop
(TCP404XL only)
5 turns 18 AWG coated wire
Refer to page 5-4
6–8
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCP303 and TCP404XL Adjustments
Adjustment Locations
Information is available for the location of the probe adjustments. (See
Figure 6-5.)
Figure 6-5: TCP303 and TCP404XL adjustment locations
TCP303 and TCP404XL Transient Response and Coarse Gain Adjustment
These procedures describe how to adjust and optimize the transient response and
coarse gain adjustment of the TCP303 and TCP404XL probes, using the 1 ms,
10 ms, and DC gain adjustments. The current source and current loop setups are
different between the two probes, but the connections are similar. Information is
available to make equipment connections. (See Figure 6-6 on page 6-11.)
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
6–9
TCP303 and TCP404XL Adjustments
Equipment Connections
1. If you are using a Tektronix oscilloscope that supports the TEKPROBE
Level 2 Interface, use the TEKPROBE Interface Cable to connect the
amplifier OUTPUT to the oscilloscope input. If you are not using a Tektronix
oscilloscope that supports the TEKPROBE Level 2 Interface, use a 50 Ω
BNC cable. If the input impedance of your oscilloscope is 1 MΩ, connect a
50 Ω feedthrough termination at the oscilloscope input. Do not connect the
termination at the amplifier output.
2. Connect the current probe to the amplifier PROBE INPUT connector.
3. If you are adjusting a TCP303, form a 1-turn current loop by connecting the
banana lead to the output connectors of the AC current source.
4. Do not clamp the current probe around any conductor, but make sure the
jaws are locked shut.
6–10
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCP303 and TCP404XL Adjustments
Figure 6-6: TCP303 and TCP404XL transient response and coarse gain adjustment
setup
Equipment Settings
Make or verify the listed equipment settings.
Table 6-9: Settings for transient response and preliminary gain adjustments
TCPA300 and TCPA400
Coupling
DC
Range:
TCPA300
5 A/V
Oscilloscope
Vertical Gain:
TCP303
TCP404XL
Using TEKPROBE Cable:
100 mA/division
Using BNC Cable:
20 mV/division
Using TEKPROBE Cable:
1 A/division
Using BNC Cable:
1 mV/division
Time Base
100 ms/division, Auto
triggered
Vertical Input
50 W
Record Length
500
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
6–11
TCP303 and TCP404XL Adjustments
Table 6-9: Settings for transient response and preliminary gain adjustments (cont.)
Coupling
DC
Offset
0V
Trigger
Type
Edge
Mode
Auto
Position
10%
Acquisition Mode
Average
Number of Waveforms
8
Measurement Type
Risetime, Amplitude
AC current source (TCP303 only)
Frequency
1 kHz square wave
Amplitude
0.3 A pk
High amplitude pulse generator (TCP404XL only)
TCP303 Procedure
Pulse Width
250 ms
Pulse Repetition
Frequency
20 Hz
Amplitude
5 A p-p
1. Remove the access plugs that cover the DC gain, 10 μs, and 1 ms adjustments
on the probe.
2. Preset the probe adjustments: Information is available for adjustment
locations. (See Figure 6-5 on page 6-9.) Do this only at the beginning of
the probe adjustment process.
a. Set the 1 ms adjustment fully clockwise.
b. Set the 10 ms adjustment fully counter-clockwise.
3. Do not clamp the current probe around any conductor, but make sure the
jaws are locked shut.
4. Press the amplifier PROBE DEGAUSS AUTOBALANCE button. Wait for
the degauss/autobalance routine to complete before proceeding. The routine
is complete when the indicator light turns green.
5. Connect the probe to the 1-turn current loop.
6. Enable the output of the generator.
6–12
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCP303 and TCP404XL Adjustments
NOTE. The DC gain, 10 μs, and 1 μs adjustments on the TCP303 interact.
Adjusting them can be a repetitive process. You may need to balance between
transient response and gain to meet both specifications at once.
7. Repeat steps 7 and 8 as necessary to achieve optimum response:
a. Adjust the DC gain and 10 ms adjustments to achieve an amplitude of six
divisions and a flat waveform (optimum response).
b. Adjust the 1 ms adjustment to achieve a flat waveform (optimum
response).
c. Repeat step a.
8. Verify the DC gain accuracy of the probe using this procedure. (See
page 5-32, TCP303 and TCP404XL Performance Verification.) You may
have to make some minor adjustments to the DC gain adjustment to achieve
the highest accuracy possible.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
6–13
TCP303 and TCP404XL Adjustments
TCP404XL Procedure
1. Move the oscilloscope trace to one graticule line from the bottom of the screen.
2. Do not clamp the current probe around any conductor, but make sure the
jaws are locked shut.
3. Remove the probe access plugs for 1 ms, 10 ms, and DC Gain.
4. Preset the probe adjustments: Information is available for adjustment
locations. (See Figure 6-5 on page 6-9.) Do this only at the beginning of
the probe adjustment process.
a. Set the 1 μs adjustment fully clockwise
b. Set the 10 ms adjustment fully counterclockwise
5. Press the amplifier PROBE DEGAUSS AUTOBALANCE button. Wait for
the degauss/autobalance routine to complete before proceeding. The routine
is complete when the PROBE DEGAUSS AUTOBALANCE LED returns
to green.
6. Lock the jaws of the probe around the built-in current loop on the high
amplitude pulse generator. Observe proper polarity; the arrow-shaped
indicator on the probe points away from the (+) terminal of the current source.
7. Repeat steps a through d to achieve optimum response:
a. Adjust the DC Gain adjustment to produce an amplitude of five graticule
divisions (5 A) at the 100 ms portion of the pulse.
b. Adjust the 10 ms control for a flat waveform to match the level at the
100 ms point.
c. Adjust the oscilloscope sweep to 1 ms/div.
d. Adjust the 1 ms control to flatten the front end of the pulse.
NOTE. The 10 μs and 1 μs adjustments on the TCP404XL interact. Adjusting them
can be a repetitive process. You may need to balance between short and long term
response to meet both specifications at once.
8. Verify the DC Gain Accuracy using this procedure. (See page 6-15, DC Gain
Adjustment.) You may have to make some minor adjustments to the DC gain
adjustment to achieve the highest accuracy possible.
6–14
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCP303 and TCP404XL Adjustments
DC Gain Adjustment
This procedure adjusts the DC gain accuracy of the TCP303 and TCP404XL
probes.
Equipment Connections
1. Connect the amplifier OUTPUT to the DMM input using a BNC-to-Dual
Banana connector, 50 Ω BNC cable, and a 50 Ω precision feedthrough
termination. Do not connect the termination at the amplifier output.
2. Connect the current probe to the amplifier PROBE INPUT connector.
3. If you are adjusting a TCP303, connect the banana lead cable to the output
connectors of the AC current source. If you are adjusting a TCP404XL,
connect the 5-turn DC current loop to the current source as shown.
4. Do not clamp the current probe around any conductor, but make sure the
slide is locked.
Figure 6-7: DC gain accuracy adjustment setup
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
6–15
TCP303 and TCP404XL Adjustments
Equipment Settings
Make or check the equipment settings in Table 6-10:
Table 6-10: Equipment settings for DC gain accuracy
Digital multimeter
Measurement Type
AC volts, autorange
Current source
Output waveshape/frequency
Squarewave, 40 Hz
Output
Off
TCPA300 and TCPA400
Procedure
Coupling
DC
Range: TCP303
5 A/V
1. Do not clamp the current probe around any conductor, but make sure the
jaws are locked shut.
2. Press the amplifier PROBE DEGAUSS AUTOBALANCE button. Wait for
the degauss/autobalance routine to complete before proceeding. The routine
is complete when the indicator light turns green.
3. Connect the current probe to the appropriate current loop. (One-turn for the
TCP303 and 5-turn for the TCP404XL.)
4. Perform the following steps with this Information: (See Table 6-11.)
a. Set the current source output to the correct current level.
b. Enable the output of the current source.
c. Adjust the DC gain adjustment on the probe to the expected output value
shown. (See Table 6-11.)
Table 6-11: DC gain accuracy adjustments for the TCP303 and TCP404XL
Probe
Range
Current
source
output (A pk)
TCP303
5 A/V
1.5 A
300.00
299.00
301.10
5A
25.00
24.91
25.09
TCP404XL 1A/mV
Expected
output, VE
(mVAC)
Minimum
output,
mVAC
Maximum
output,
mVAC
5. Remove the probe from the current loop.
6. If the DC gain adjustment was adjusted, verify the pulse response by repeating
this procedure. (See page 6-9, TCP303 and TCP404XL Transient Response
and Coarse Gain Adjustment.)
7. When the probe adjustments are done, reinstall the probe access plugs for the
1 μs, 10 μs, and DC Gain adjustments.
6–16
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Maintenance
Customer Maintenance
This manual supports maintenance of the amplifiers and probes.
Service Strategy
The amplifiers have some mechanical and electrical parts that may be replaced
by the customer. This section describes the preventive maintenance and repair
procedures.
The probes can be repaired to component level. Information on troubleshooting
and repair is available. (See page 3-17, Troubleshooting and Error Codes.)
Preventive Maintenance
The TCPA300 and TCPA400 Current Probe Amplifiers and current probes require
little maintenance during normal use. The primary maintenance involves cleaning
accumulated dirt from the probe body and, if necessary, cleaning the exposed
core surfaces in the probe jaw.
General Care
Protect the instrument from adverse weather conditions. The instrument is not
waterproof.
CAUTION. To avoid damage to the instrument, do not expose it to sprays,
liquids, or solvents. Do not use chemical cleaning agents; they may damage the
instrument. Avoid chemicals that contain benzene, toluene, xylene, acetone, or
similar solvents.
Cleaning the Exterior
Clean the exterior surfaces of the instrument with a dry, lint-free cloth or a
soft-bristle brush. If dirt remains, use a cloth or swab dampened with a 75%
isopropyl alcohol solution. A swab is useful for cleaning in narrow spaces around
the controls and connectors. Do not use abrasive compounds on any part of the
instrument.
CAUTION. Avoid getting moisture inside the instrument during exterior cleaning
and use only enough solution to dampen the cloth or swab. Use a 75% isopropyl
alcohol solution as a cleanser, and rinse with deionized water.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
7–1
Disassembly
Disassembly
To access the internal adjustments or to replace internal components of the
amplifiers, you need to remove the instrument case and internal covers. This
section covers the disassembly of the amplifiers. Current probe procedures are
described later in this section.
Amplifiers
Use these procedures when making adjustments or replacing components in the
amplifiers.
WARNING. Amplifier disassembly must be performed by qualified service
personnel at an antistatic workstation to avoid personal injury or loss of life.
The following components are replaceable:
Outer Case
Front Panel Assembly
Amplifier Board
Power Supply
Fan
Equipment Required
Use the listed equipment to replace the internal components.
Table 7-1: Equipment required
7–2
Qty
Description
1
#2 Phillips screwdriver
1
T-15 screwdriver
1
Long-nose pliers
1
3/8-inch nutdriver or wrench
1
Torque wrench
1
Antistatic wrist strap
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Disassembly
Removing the Outer Case and Internal Covers
To replace internal components, you need to remove the outer case and internal
covers. You may also want to remove the case and covers to access the internal
adjustments. The following procedures describe the removal process:
1. Disconnect the AC cord and any probes or cables from the amplifier.
2. Remove the 3 screws from the rear of the amplifier and slide the case off the
rear side of the amplifier as shown.
Figure 7-1: Removing the case from the amplifier
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
7–3
Disassembly
3. Remove the 6 screws that secure the right-side inner panel to the chassis.
Figure 7-2: Removing the right-side inner panel
7–4
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Disassembly
4. Remove the 4 screws that secure the left-side inner panel to the chassis.
Figure 7-3: Removing the left-side inner panel
You now have exposed access to the amplifier adjustments. If you need to replace
any of the internal components, refer to the following instructions.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
7–5
Disassembly
Replacing the Front Panel Assembly
If you need to replace the Front Panel Assembly, do the following:
1. Wear an antistatic wriststrap when handling the circuit assemblies.
2. Using pliers, remove the heat sink clip from U9 as shown.
Figure 7-4: Disconnecting the front-panel assembly
3. Disconnect the front-panel ribbon connector from J4 on the amplifier board.
Release the tab on the connector by carefully lifting the ends of the tab before
removing the ribbon cable from the connector as shown.
4. Remove the screw that attaches the probe input connector frame to the
front-panel assembly. Pull the front-panel assembly away from the amplifier.
5. Do in reverse steps 4 through 1 to install a new front-panel assembly.
7–6
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Disassembly
Replacing the Amplifier Board
If you need to replace the amplifier board, you must detach the rear- and frontpanel assemblies of the amplifier from the chassis.
1. Wear an antistatic wriststrap when handling the circuit assemblies.
2. Remove the 2 Phillips screws that attach the AC power connector to the rear
panel.
3. Gently pull back the rear panel enough to allow clearance for the amplifier
board.
4. Disconnect the DC power supply connector from J3 on the amplifier board.
5. Disconnect the fan connector from J2 on the amplifier board.
6. Using pliers, remove the three heat sink clips from U9, Q18, and Q21 as
shown.
Figure 7-5: Removing the three heat sink clips
7. Disconnect the front-panel ribbon connector from J4 on the amplifier board.
Be sure to carefully release the tab on the connector before removing the
ribbon cable from the connector. Only lift the ends of the tab to release it
from the connector. (See Figure 7-5.)
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
7–7
Disassembly
8. Remove the screw that attaches the probe input connector to the front panel
amplifier board to the chassis. Pull the front panel assembly away from the
amplifier and set it aside as shown.
9. Remove the three screws that attach the amplifier board to the chassis.
10. Do in reverse steps 8 through 2 to install a new amplifier board.
Figure 7-6: Removing the amplifier board
7–8
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Disassembly
Replacing the Power Supply
To replace the power supply, do the following:
1. Disconnect the AC and DC power connectors from the power supply.
2. Remove the four screws from the power supply.
3. Remove the power supply from the chassis.
4. Do in reverse steps 3 through 1 to install a new power supply.
Figure 7-7: Replacing the power supply
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
7–9
Disassembly
Replacing the Fan
If you need to replace the fan, you must first detach the rear panel of the amplifier
from the chassis to gain access to the fan:
1. Remove the 2 Phillips screws that attach the AC power connector to the rear
panel as shown.
Figure 7-8: Removing the AC power connector
7–10
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Disassembly
2. Disconnect the DC power supply connector from J2 on the amplifier board
asn shown.
3. Disconnect the fan connector from J3 on the amplifier board.
4. Gently pull back the rear panel enough to allow access to the four nuts that
secure the fan to the rear panel.
Figure 7-9: Removing the fan
5. Remove the four 3/8-inch nuts that secure the fan to the rear panel.
6. Lift the fan off of the four studs on the rear panel.
7. Do in reverse steps 6 through 2 to install a new fan. Be careful not to pinch
the power supply cable wires under the fan.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
7–11
Disassembly
Probes
Use these procedures when repairing or replacing defective components in the
current probes.
WARNING. Probe disassembly must be performed by qualified service personnel
to avoid personal injury or loss of life.
The probes that mate with the TCPA300 and TCPA400 Current Probe Amplifiers
have two physical styles. The TCP305 and TCP312 use a slender form factor that
contain three replaceable assemblies - the connector/cable, the circuit board,
and the current transformer.
The TCP303 and TCP404XL use a pistol-style case with an integral handgrip.
These probes contain two replaceable assemblies - the connector/cable/circuit
board assembly and the current transformer. Both probes use a few mechanical
components that are replaceable, such as springs and plastic parts.
Equipment Required
Listed is the required equipment to service the probes.
Table 7-2: Equipment required
7–12
Qty
Description
1
#2 Phillips screwdriver
1
Isopropyl alcohol
1
Silicone-based grease
1
25 W soldering iron
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Disassembly
TCP305 and TCP312
Disassemble the TCP305 or TCP312 probe body as follows:
1. Remove the two screws from the bottom of the probe and pull the strain relief
boot back as shown. Note: When reassembling the probe, insert and tighten
the two screws. Verify that the slider works smoothly. If it does not, loosen
the screws slightly.
Figure 7-10: Removing the strain relief boot
2. Move the probe slide assembly to the open position.
NOTE. The probe slide contains a tiny metal ball. In step 3, be careful not to lose
the ball by accidentally letting it fall out.
3. Hold the probe in a top-up horizontal position and slide the top half of the
probe body off as shown. (See Figure 7-11 on page 7-14.)
4. Remove the metal ball.
5. Turn the probe upside down, push the slide back slightly, and remove the
slide. (See Figure 7-12 on page 7-14.)
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
7–13
Disassembly
Figure 7-11: Removing the top half of the probe
Figure 7-12: Removing the probe slide
7–14
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Disassembly
Replacing the Current
Transformer
Replace the current transformer of the probe as follows:
1. Gently lift the front edge of the circuit board and transformer enough to clear
the probe body as shown.
2. Pull the transformer socket straight off the circuit board pins.
Figure 7-13: Removing the current transformer
3. Before reassembling the probe, be sure that the gap between the stationary
and moveable core pieces is clean. If necessary, use isopropyl alcohol or a
similar cleaning agent to clean the pieces. Also, clean the contacts of the
slide switch, if necessary. If the plastic slide assembly requires lubrication,
sparingly apply silicone-based grease to the parts.
4. Probe reassembly is the reverse of steps 1 through 2 of this procedure and
steps 1 through 5. (See page 7-13, TCP305 and TCP312.)
NOTE. Exercise care when fitting the slide back into the probe body; aligning the
switch contacts can require patience.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
7–15
Disassembly
Replacing the Circuit
Board or Cable Assembly
Replace the circuit board or cable assembly of the probe as follows:
1. Remove the current transformer using this procedure. (See page 7-15,
Replacing the Current Transformer.)
2. Lift the plastic cable housing from the probe body half as shown.
3. Unsolder the probe body connection on the circuit board. Be careful not to
damage the circuit board.
4. Lift the cable and the circuit board from the probe body half.
Figure 7-14: Removing the circuit board and cable assembly
5. If you need to replace the cable, separate the cable and circuit board by
unsoldering the cable ground wire and disconnecting the cable connector
from the circuit board.
6. If you need to replace the circuit board, do step 5, and then unsolder the
ground wire from the circuit board to the probe body half.
7. Before reassembling the probe, be sure that the gap between the stationary
and moveable core pieces is clean. If necessary, use isopropyl alcohol or a
similar cleaning agent to clean the pieces. Also, clean the contacts of the slide
switch, if necessary. Should the plastic slide assembly require lubrication,
sparingly apply silicone-based grease to the parts.
8. Probe reassembly is the reverse of steps 1 through 6 of this procedure and
steps 1 through 5. (See page 7-13, TCP305 and TCP312.)
CAUTION. To avoid damaging the wires inside the probe, carefully dress the
wires in the lower body half to avoid contact with the slide assembly. Exercise
care when fitting the slide back into the probe body; aligning the switch contacts
can require patience.
7–16
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Disassembly
TCP303 and TCP404XL
The following procedures explain how to disassemble the probe body and replace
the current transformer, the circuit board, and the cable assembly.
WARNING. Probe disassembly must be performed by qualified service personnel
to avoid personal injury or loss of life.
1. Unlock the probe slide.
2. Place the probe on a flat surface with the screw heads facing up.
3. Using a 3/32 inch Allen wrench, remove the eight retaining screws from the
case.
4. While holding the squeeze handle and slide, lift the top part of the probe
body off.
5. Remove the slide.
WARNING. There is a spring in the squeeze handle that can pop out and cause
personal injury unless care is exercised when disassembling the probe.
6. Lift the cable out of the probe handle and insert a pair of pliers in the handle
as shown.
Figure 7-15: Removing the handle
7. While maintaining a firm grip on the pliers, carefully lift the squeeze handle
and gear out of the probe. (See Figure 7-15.) (See Figure 7-16 on page 7-18.)
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
7–17
Disassembly
Removing the Current
Transformer
Remove the current transformer of the probe as follows:
8. To remove the current transformer, lift the assembly out of the probe as shown
and unplug it from the circuit board.
Figure 7-16: Removing the current transformer
Removing the Circuit
Board or Cable (TCP303)
The circuit board and cable are replaceable separately on TCP303 probes (see
note).
NOTE. The circuit board and cable on TCP303 probes are replaceable separately
on probes with serial number B020000 and above.
For TCP303 probes with a serial number below B020000, the original
transformer and cable/circuit board subassemblies must be replaced with updated
versions as a set (order Replacement Kit Number 050-3663-XX). After the kit is
installed, the separate components can be replaced with part numbers for probes
with serial number B020000 and above.
9. To remove the circuit board, cut the cable tie that secures the cable to the
board, and then disconnect the cable from the board. (See Figure 7-17 on
page 7-19.) When reassembling the probe, do not tighten the new cable tie
until you seat the board and cable in the probe case, to allow enough cable
length for a proper fit.
7–18
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Disassembly
10. To remove the cable, do step 9 and then unsolder the two switch wires.
Figure 7-17: Removing the circuit board and cable
Removing the Circuit
Board and Cable Assembly
(TCP404XL)
Reassembling the Probe
The circuit board and cable are replaced as an assembly on TCP404XL probes.
11. Observe the routing of the switch leads through the circuit board shield. It
is important that you route the leads in the same way when you replace the
assembly. Desolder the two leads from the slide switch as shown and lift the
circuit board and cable clear.
Reassemble the probe by doing the following:
12. Before reassembling the probe, be sure to clean the gap between the stationary
and moveable core pieces. If necessary, clean the core pieces using a lint-free
cloth and water or isopropyl alcohol (IPA). Also, clean the contacts of the
slide switch, if necessary.
13. Should the plastic slide assembly require lubrication, sparingly apply
silicone-based grease to the parts.
14. Probe reassembly is the reverse of steps 1 through 10 or 11, depending on the
probe model and what you are replacing. You may need to squeeze the handle
slightly to align the gear teeth with the slide rack.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
7–19
Isolating Hardware Faults
Isolating Hardware Faults
Use the following procedures to help locate a hardware malfunction.
You can isolate the symptoms to the amplifier or probe by substituting a known
good probe or amplifier. If you suspect that you have a defective probe and you
don’t have another compatible probe, you can use the calibration adapter in place
of the probe to verify some of the amplifier functions.
Information about some of the failures that can occur with the amplifiers and
probes is available. (See Table 7-3.) (See Table 7-4.)
Table 7-3: Amplifier hardware faults
Symptom
Possible cause
Repair action
Amplifier does not power on.
LEDs do not turn on and fan
does not work.
Internal power supply problem
Connector loose between main board
and front panel
Front panel is defective
Check for +15 V on power supply connector J2, pin 1
at main board. If OK, replace amplifier board. If not,
replace power supply.
Secure ribbon cable from front-panel assembly to
main board
Replace front-panel assembly
LEDs do not turn on and fan
works.
Internal power supply problem
Connector loose between main board
and front panel
Front panel is defective
Check for +15 V on power supply connector J2, pin 1
at main board. If OK, check power supply test points
on main board: +5VD, +5VA, -5VA, +10V, -10V. If
these voltages check OK, replace the front-panel
assembly. If not, replace the main board.
Secure ribbon cable from front-panel assembly to
main board
Replace front-panel assembly
LEDs turn on and fan does not
work.
Defective fan or defective power
supply
Check for greater than +7V at fan connector J3, pin
1 at main board. If present, replace fan. If not, check
for +15 V input from power supply. If +15 V is present,
replace the amplifier board. If not, replace the power
supply.
LEDs turn on in a random
pattern (different than is
documented in this manual)
Front panel is defective
Replace front-panel assembly
One amplifier range does
not work, other range is OK.
(TCPA300 only)
Defective amplifier circuit
Replace main board assembly
Table 7-4: Probe hardware faults
Symptom
Possible Cause
Repair Action
Probe Open LED stays
continuously lit, even with
the probe slider closed.
Open coil in probe.
Substitute probe with another probe or the Calibration
Adapter - if the Probe Open LED goes out , coil is open
- repair bad connection or replace coil
7–20
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Isolating Hardware Faults
Determining the Amplifier Firmware Version Number
If you are having a problem with your amplifier, it may be helpful to know the
version of firmware that is in the amplifier. The firmware version may help the
Technical Support Center to isolate the amplifier symptoms to a specific cause.
To determine the amplifier firmware version number, do the following:
1. Turn the amplifier power off.
2. Press and hold the COUPLING button.
3. Turn the amplifier power on.
After the power-on LED sequence, the LEDs on the far-left side of the front
panel show a binary representation of the firmware version number. The firmware
version number is the sum of the values for the lit LEDs. Shown are the values
each LED represent.
Figure 7-18: Displaying the amplifier firmware version number
For example, if the NONCOMPATIBLE PROBE TYPE LED is lit, the firmware
version number is 1.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
7–21
Isolating Hardware Faults
7–22
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Replaceable Parts
Replaceable Parts
This section contains a list of the components that are replaceable for the
TCPA300 and TCPA400. As described below, use these lists to identify and order
replacement parts.
Parts Ordering Information
Replacement parts are available from or through your local Tektronix, Inc.,
service center or representative.
Changes to Tektronix instruments are sometimes made to accommodate improved
components as they become available and to give you the benefit of the latest
circuit improvements. Therefore, when ordering parts, it is important to include
the following information in your order:
Part number
Instrument type or model number
Instrument serial number
Instrument modification number, if applicable
If a part you order has been replaced with a different or improved part, your local
Tektronix service center or representative will contact you concerning any change
in the part number.
Using the Replaceable Parts List
The tabular information in the Replaceable Parts List is arranged for quick
retrieval. Understanding the structure and features of the list will help you find all
the information you need for ordering replacement parts.
Item Names
Abbreviations
In the Replaceable Parts List, an Item Name is separated from the description by
a colon (:). Because of space limitations, an Item Name may sometimes appear
as incomplete. For further Item Name identification, U.S. Federal Cataloging
Handbook H6-1 can be used where possible.
Abbreviations conform to American National Standards Institute (ANSI) standard
Y1.1.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
8–1
Amplifier Replaceable Parts
Amplifier Replaceable Parts
Figure 8-1: TCPA300 and TCPA400 replaceable parts
8–2
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Amplifier Replaceable Parts
Table 8-1: TCPA300 and TCPA400 replaceable parts list
Fig. &
index
number
Tektronix
part
number
8-1-1
174-4676-XX
-2
-3
-4
-5
-6
Serial no.
effective
Serial no.
discont’d
Qty
Name & description
1
CABLE ASSEMBLY,DC, POWER SUPPLY
210-0457-XX
4
NUT,PL,ASSEM WA:6-32 X 0.312,STL CD PL,W/LOCKWASHER
119-6721-XX
1
FAN,TUBEAXIAL:12VDC,0.10A,1.2W,14CFM,5600RPM,32DBA,50MM X 50MM
X 15MM, W/3.5 IN LEADS, 2-PIN C
050-3547-XX
1
PANEL,REAR:0.046 AL,W/LABEL;TCPA300 /TCPA400
119-0420-XX
1
FILTER,RFI:LINE 6A,250VAC,DC-400HZ,LEAKAGE CURRENT 2UA AT
220V/55HZ,FN223B-6/06
211-0038-XX
2
SCREW,MACHINE:4-40 X 0.312,FLH,100 DEG,STL CD PL,POZ
-7
380-1157-XX
1
HOUSING:MAIN AMPLIFIER,PLASTIC
-8
211-0747-XX
20
SCREW,MACHINE:6-32 X 0.188,PNH,STL,CDPL,T-15 TORX DR
-9
348-1525-XX
2
FOOT:FRONT,SANTOPRENE,BLACK,64 DEROMETER,TEXTURED
-10
174-4721-XX
1
CABLE ASSEMBLY,AC, POWER SUPPLY
-11
390-1213-XX
1
CABINET:RIGHT AMPLIFIER AC,0.032 AL
-12
211-0720-XX
1
SCR,ASSEM WSHR:6-32 X 0.500,PNH,STL,CDPL,T-15 TORX DR,MACHINE
-13
671-5434-XX
1
CIRCUIT BOARD:MAIN,TCPA300
671-5354-XX
1
CIRCUIT BOARD:MAIN,TCPA400
-14
214-5018-XX
3
HEAT SINK,MISC:CLIP,TO-220 TRANSISTOR,PHOSPHOR BRONZE CLIP
FOR TO-220,0.25 IN W X 0.507 IN L, F
-15
614-1018-XX
1
FRONT PANEL ASSY, TCPA300,W/CABLE ASSY,SP:FLAT FLEX
614-1019-XX
1
FRONT PANEL ASSY, TCPA400,W/CABLE ASSY,SP:FLAT FLEX
-16
390-1209-XX
1
CABINET:LEFT AMPLIFIER DC,0.032 AL
-17
119-6823-XX
1
POWER SUPPLY:40W,AC-DC,90-264 VAC IN,15V 2.6A OR 3.3A (W/20 CFM
AIRFLOW) OUT,SAFETY CONTROLLED
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
8–3
Amplifier Replaceable Parts
Table 8-2: Power cord identification
Plug configuration
8–4
Normal usage
Option number/
North America 120 V
Standard 161-0066-00
Universal Euro
A1 161-0066-09
United Kingdom
A2 161-0066-10
Australia
A3 161-0066-11
Switzerland
A5 161-0154-00
Japan
A6 161-A005-00
China
AC 161-0306-00
No power cord supplied.
A99
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Amplifier Replaceable Parts
Figure 8-2: TCPA300 and TCPA400 standard accessories
Table 8-3: TCPA300 and TCPA400 standard accessories parts list
Fig. &
index
number
Tektronix
part
number
Qty
Name & description
8-2-1
011-0049-XX
1
TERMINATOR,BNC:COAXIAL,50 OHMS,2W,BNC
-2
012-0117-XX
1
CABLE ASSY:COAX,RFD,50 OHM,30.0L,MALE,BNC X MALE,BNC
-3
012-1605-XX
1
CABLE ASSY RF:TEKPROBE INTERFACE
071-1183-XX
1
MANUAL, INSTRUCTION,ENGLISH,TCPA300/400 AMPLIFIERS AND
TCP300/400 SERIES CURRENT PROBES
071-1184-XX
1
MANUAL, INSTRUCTION,JAPANESE,TCPA300/400 AMPLIFIERS AND
TCP300/400 SERIES CURRENT PROBES,OPTION L5
Serial no.
effective
Serial no.
discont’d
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
8–5
Amplifier Replaceable Parts
Figure 8-3: TCPA300 and TCPA400 optional accessories
Table 8-4: TCPA300 and TCPA400 optional accessory parts list
Fig. &
index
number
Tektronix
part
number
Qty
Name & description
8-3-1
174-4765-XX
1
CABLE ASSY, CALIBRATION ADAPTER
-2
016-1922-XX
1
CASE, TRANSIT, CURRENT MEASUREMENT SYSTEM
-3
067-1478-XX
1
POWER MEASUREMENTS DESKEW FIXTURE, TCP200,TCP300, A6300
SERIES PROBES
TDSPWR2
1
TDSPWR2 POWER MEASUREMENT AND ANALYSIS SOFTWARE
8–6
Serial no.
effective
Serial no.
discont’d
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Current Probes Replaceable Parts
Current Probes Replaceable Parts
Figure 8-4: TCP305 and TCP312 replaceable parts
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
8–7
Current Probes Replaceable Parts
Table 8-5: TCP305 and TCP312 replaceable parts list
Fig. &
Index
Number
Tektronix
Part
Number
Qty
Name & Description
8-4-1
204-0288-XX
1
BODY HALF,PROBE:UPPER BODY HALF,BLACK,POLY
-2
214-0835-XX
1
SPRING,HLCPS:0.127 OD X 2.65 L,SST
-3
214-0849-XX
1
RTNR RETURN SPR:BRS CD PL
-4
352-0106-XX
1
HOLDER,SPR RTNR:DELRIN
-5
174-4690-XX
1
CABLE ASSY,RF COAX,60.0 L
-6
671-5427-XX
1
CKT BD ASSY, TCP305
671-5433-XX
1
CKT BD ASSY, TCP312
-7
213-0087-XX
2
SCREW,TPG,TC:2-32 X 0.5,TYPE BT,PANHEAD,STEEL,CADIUM
PLATED,POZIDRIVE
-8
335-0906-XX
1
MARKER,IDENT:PROBE IDENT LABEL,TCP305
335-0907-XX
1
MARKER,IDENT:PROBE IDENT LABEL,TCP312
-9
204-0714-XX
1
BODY,HALF:LOWER BODY HALF W/CONTACTS
-10
120-1984-XX
1
XFMR SUBASSY:UPPER & LOWER TRANSFORMER SUBASSY, TCP305
120-2029-XX
1
XFMR SUBASSY:UPPER & LOWER TRANSFORMER SUBASSY, TCP312
-11
214-0854-XX
1
CONTACT,ELEC:UPPER SHELF,CU BE
-12
351-0121-XX
1
CONT ASSY,ELEC:PROBE SLIDE ASSY
-13
214-0997-XX
1
BALL,BEARING:0.094,SST
Serial No.
Effective
Serial No.
Discont’d
Standard Accessories
-14
196-3120-XX
1
LEAD,ELECTRICAL:23 AWG,6.0 L,GROUND
-15
016-1923-XX
1
COVER,PROBE,SMALL
071-1185-XX
1
INSTRUCTION SHEET,TCP300/400 SERIES CURRENT PROBES
8–8
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Current Probes Replaceable Parts
Figure 8-5: TCP303 replaceable parts
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
8–9
Current Probes Replaceable Parts
Table 8-6: TCP303 replaceable parts list
Fig. &
Index
Number
Tektronix
Part
Number
Qty
Name & Description
8-5-1
204-0713-XX
1
BODY HALF,PROBE:LEFT W/CONTACTS
-2
351-0955-XX
1
SLIDE ASSEMBLY:WITH WARNING LABEL
-3
335-0912-XX
1
MARKER,IDENT:PROBE ID LABEL,TCP303
-4
214-2422-XX
-5
050-3663-XX
Serial No.
Effective
B010000
Serial No.
Discont’d
B019999
1
SPRING,FLAT:UPPER CAN
1
TRANSFORMER:SUBASSEMBLY, TOP AND BOTTOM, TCP303
1
120-2028-XX
-6
B020000
204-0712-XX
1
TRANSFORMER:SUBASSEMBLY, TOP AND BOTTOM, TCP303
1
BODY HALF,PROBE:RIGHT W/CONTACTS
-7
211-0093-XX
6
SCREW,CAP:4-40 X 0.75,SCH,STL,CD PL,HEX REC
-8
348-0023-XX
4
PLUG,HOLE:U/W0.14 DIA HOLE,WHT PLSTC
-9
211-0183-XX
-10
050-3663-XX
B010000
B019999
2
SCREW,CAP:4-40 X 0.5,SCH,STL,CD PL,HEX REC
1
PROBE SUBASSY, TESTED BOARD AND CABLE, TCP303
1
CABLE ASSEMBLY, TCP303, RF, COAX, 12 COND, JBX CONNECTOR,
SAFETY CONTROLLED, W/LEMO CONNECTOR
1
PROBE SUBASSY, TESTED BOARD AND CABLE, TCP303
1
CIRCUIT BOARD ASSEMBLY, TCP303
1
-11
174-4962-XX
B020000
050-3663-XX
B010000
B019999
1
679-6287-XX
B020000
-12
214-2446-XX
1
SPR,HLCL,TRSN:0.1 OD X 0.5 L,MUSIC WIRE
-13
367-0218-XX
1
HANDLE,SQUEEZE:PROBE P6301
-14
401-0352-XX
1
GR CLUSTER,SPUR:(2)18 AND (1) 24 T,PLASTIC
-15
343-0149-XX
1
STRAP, TIEDOWN,E,6.75L,PLASTIC
-16
016-1924-XX
1
COVER,PROBE,LARGE
071-1185-XX
1
INSTRUCTION SHEET,TCP300/400 SERIES CURRENT PROBES
Standard Accessories
1
TCP303 probes with S/N B010000 - B019999: The original transformer and cable/circuit board subassemblies must be replaced with updated versions as
a set (order Replacement Kit Number 050-3663-XX). After the kit is installed, the separate components can be replaced with part numbers for probes with
S/N B020000 and above.
8–10
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Current Probes Replaceable Parts
Figure 8-6: TCP404XL replaceable parts
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
8–11
Current Probes Replaceable Parts
Table 8-7: TCP404XL replaceable parts list
Fig. &
Index
Number
Tektronix
Part
Number
Qty
Name & Description
8-6-1
204-0713-XX
1
BODY HALF,PROBE:LEFT W/CONTACTS
-2
351-0955-XX
1
SLIDE ASSEMBLY:WITH WARNING LABEL
-3
335-0913-XX
1
MARKER,IDENT:PROBE ID LABEL,TCP404XL
-4
214-2422-XX
1
SPRING,FLAT:UPPER CAN
-5
120-1962-XX
1
TRANSFORMER:SUBASSEMBLY, TOP AND BOTTOM, TCP404XL
-6
204-0712-XX
1
BODY HALF,PROBE:RIGHT W/CONTACTS
-7
211-0093-XX
6
SCREW,CAP:4-40 X 0.75,SCH,STL,CD PL,HEX REC
-8
348-0023-XX
4
PLUG,HOLE:U/W0.14 DIA HOLE,WHT PLSTC
-9
211-0183-XX
2
SCREW,CAP:4-40 X 0.5,SCH,STL,CD PL,HEX REC
-10
174-4816-XX
1
PROBE SUBASSY, TESTED BOARD AND CABLE, TCP404XL
-11
214-2446-XX
1
SPR,HLCL,TRSN:0.1 OD X 0.5 L,MUSIC WIRE
-12
367-0218-XX
1
HANDLE,SQUEEZE:PROBE P6301
-13
401-0352-XX
1
GR CLUSTER,SPUR:(2)18 AND (1) 24 T,PLASTIC
-14
016-1924-XX
1
COVER,PROBE,LARGE
071-1185-XX
1
INSTRUCTION SHEET,TCP300/400 SERIES CURRENT PROBES
Serial No.
Effective
Serial No.
Discont’d
Standard Accessories
8–12
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Glossary
Glossary
amp-second product
The unit of measure defining the maximum amount of pulsed current that can
be measured before the probe core becomes saturated. The amp-second rating
applies only to measurement values between the maximum continuous and
maximum pulse current ratings of the probe. The amp-second rating is equal
to the peak current multiplied by the pulse width at the 50% point.
auto-balance
A process that removes unwanted DC offsets from the TCPA300 and
TCPA400 circuitry to ensure maximum measurement accuracy. This process
is performed during the probe degauss routine.
bucking current
Current fed back by the TCPA300 and TCPA400 to the current probe during
DC and low-frequency AC measurements. Bucking current nulls most of the
magnetic field in the probe core, allowing linear DC and AC measurements
simultaneously.
conventional current flow
The flow of the positive charge in a conductor. Conventional current flow is
from positive to negative. The arrows on current probes point in the direction
of conventional current flow. Conventional current flow is in the opposite
direction of electron current flow.
degauss
A process of eliminating residual magnetism from the probe core by feeding
a decaying sine wave into the core. The degaussing process should be
performed before clamping the probe around a conductor, whenever the probe
becomes saturated by current overloads, or whenever the probe is exposed
to a magnetic field. The term is derived from one of the units of magnetic
flux density.
electron current flow
The flow of the electrons in a conductor. Electron current flow is from
negative to positive. The arrows on current probes point in the opposite
direction of electron current flow. Electron current flow is in the opposite
direction of conventional current flow.
flux
The density of a magnetic field. As the number of flux lines increases,
the magnetic field strength increases. Current in the conductor under test
generates flux lines in the probe core by inducing a voltage in the core.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Glossary-1
Glossary
Hall device
A thin, rectangular piece of semiconductor material located in the core of the
current probe. The Hall device uses the Hall effect for DC and low-frequency
AC measurements.
Hall effect
The effect that produces a voltage potential in the Hall device when magnetic
lines of force pass through the device. The voltage potential is directly
proportional to the magnetic field strength. The voltage polarity is determined
by the magnetic field polarity. A bias supply is required to produce the Hall
effect. The TCP300 and TCP400 Series current probes use the Hall effect for
DC and low-frequency AC measurements.
insertion impedance
The equivalent series impedance introduced to a test circuit when the current
probe is clamped around a test conductor.
magnetic susceptibility
A figure expressing the amount of current induced into the probe by an
external magnetic field of known intensity. The lower the figure is, the less
the probe is influenced by external magnetic fields.
saturation
A condition that occurs when the magnetic field strength in the probe core
exceeds the maximum level that the core can absorb. When saturation occurs
the probe no longer responds linearly to an increase in magnetic field strength,
resulting in measurement inaccuracies. A current overload condition will
cause core saturation. After saturation occurs, the probe core usually retains
residual magnetism, which continues to produce inaccuracies until the probe
is degaussed. The probe should be degaussed after saturation occurs.
Glossary-2
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Index
Index
A
AC coupling, 1-12, 2-4, 3-3
Adjustments,
overview, 6-1
TCP303 & TCP404XL, 6-8
TCP305 & TCP312, 6-5
TCPA300 & TCPA400, 6-2
amp-second product, Glossary-1
Amp-second product, 3-4
Applications, 3-10
auto-balance, Glossary-1
Autobalance function, 2-1
B
bucking current, Glossary-1
Bucking current, 3-7
Button,
COUPLING, 2-4
MANUAL BALANCE, 2-3
ON/STANDBY, 2-4
PROBE DEGAUSS/
AUTOBALANCE, 2-1
RANGE, 2-4
C
Cleaning, 7-1
Connecting,
a current probe to a circuit
under test, 1-11
a current probe to the
amplifier, 1-7
the amplifier to an
oscilloscope, 1-6
Connector,
OUTPUT, 2-4
PROBE INPUT, 2-4
Continuity measurements, 3-14
Control summary, 2-1
conventional current, Glossary-1
See also electron current
COUPLING button and
indicator, 2-4
Coupling modes, 3-3
CT-4 high-current adapter, 1-4,
3-8
Current limitations,
amp-second product, 3-4
maximum continuous, 3-4
maximum pulsed, 3-4
D
DC coupling, 2-4, 3-3
DC current loops,
constructing, 5-4
DC gain adjust, optimizing, 2-5
DC LEVEL control, 3-3
degauss function, Glossary-1
Degauss function, 1-9, 2-1, 3-1
functional check, 5-14
Differential current, 3-1
E
electron current, Glossary-1
See also conventional current
Error Codes,
correcting, 3-22
displaying, 3-19
shutdown error, 3-22
Extending the current range of the
probes, 3-7
F
flux, Glossary-1
Frequency derating, 3-4
Front panel controls, 2-1
G
Gauss, Glossary-1
GPIB Operation, 2-5
H
Hall device, Glossary-2
Hall effect, Glossary-2
Hardware faults, isolating, 7-20
I
Increasing bucking current, 3-7
Increasing probe sensitivity, 3-8
Indicator,
COUPLING, 2-4
MANUAL BALANCE, 2-3
NONCOMPATIBLE PROBE
TYPE, 2-3
NOT TERMINATED INTO
50 OHMS, 2-3
OVERLOAD, 2-3
PROBE DEGAUSS/
AUTOBALANCE, 2-2
PROBE OPEN, 2-3
RANGE, 2-4
Inductance measurements, 3-12
insertion impedance, Glossary-2
\iTest Record,
Performance
Verification:TCP303, 5-43
Performance
Verification:TCP305, 5-30
Performance
Verification:TCP312, 5-31
Performance
Verification:TCP404XL, 5-44
Performance
Verification:TCPA300, 5-17
Performance
Verification:TCPA400, 5-18
M
Maintenance, 7-1
Making DC current loops, 5-4
MANUAL BALANCE buttons
and indicator, 2-3
Maximum continuous current
rating, 3-4
Maximum measurement times, 3-5
Maximum pulsed current
rating, 3-4
Measuring continuity, 3-14
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Index-1
Index
Measuring current,
AC, 1-12
current nulls, 3-1
DC, 1-11
differential current, 3-1
Measuring inductance, 3-12
N
NONCOMPATIBLE PROBE
TYPE,
indicator, 2-3
NOT TERMINATED INTO 50
OHMS indicator, 2-3
Null current, 3-1
O
ON/STANDBY button, 2-4
Optional Accessories, 1-4, 8-6
Options, 1-2
OUTPUT connector, 2-4
OVERLOAD indicator, 2-3
P
Performance Verification,
overview, 5-1
TCP303 & TCP404XL, 5-32
TCP305 & TCP312, 5-19
TCPA300 & TCPA400, 5-3
Test Record:TCP303, 5-43
Test Record:TCP305, 5-30
Test Record:TCP312, 5-31
Test Record:TCP404XL, 5-44
Test Record:TCPA300, 5-17
Test Record:TCPA400, 5-18
Power on the amplifier, 1-7
PROBE
DEGAUSS/AUTOBALANCE
button and indicator, 2-1
PROBE
DEGAUSS/AUTOBALANCE
button, 1-9
Index-2
PROBE
DEGAUSS/AUTOBALANCE
indicator, 2-2
Probe Holders, 1-4
PROBE INPUT connector, 2-4
PROBE OPEN indicator, 2-3
Probes,
coupling, 3-3
degaussing
(demagnetizing), 1-9,
2-1
description, 1-2
disassembly, 7-12
extending the current
range, 3-7
increasing the current
limit, 3-7
maintenance, 7-1
maximum current limits, 3-4
operating the probe slide, 1-8
saturation, 3-4
R
RANGE button and indicator, 2-4
Replaceable Parts,
overview, 8-1
TCP303, 8-9
TCP305 & TCP312, 8-7
TCP404XL, 8-11
TCPA300 & TCPA400, 8-2
Replacing,
Amplifier Board, 7-7
Fan, 7-10
Front Panel Assembly, 7-6
Instrument Case & Internal
Covers, 7-3
Power Supply, 7-9
Probe Circuit Board or Cable
Assembly, 7-16–7-19
Probe Current
Transformer, 7-15, 7-18
S
Safety Summary, ix
saturation, Glossary-2
Shutdown error, 3-22
Specifications, 4-1
Standard Accessories, 1-3, 8-5
susceptibility, Glossary-2
T
TCP303 & TCP404XL,
DC accuracy adjustment, 6-15
DC accuracy check, 5-34
rise time check, 5-37
transient response & gain
adjustment, 6-9
TCP303,
bandwidth check, 5-40
TCP305 & TCP312,
bandwidth check, 5-27
DC accuracy check, 5-21
rise time check, 5-25
TCP404XL,
bandwidth check, 5-42
maximum measurement
times, 3-5, 4-10
TCPA300 & TCPA400,
bandwidth check, 5-8
DC coupling check, 5-13
DC gain accuracy check, 5-6
disassembly, 7-2
front panel display check, 5-5
TEKPROBE-to-TEKPROBE
interface cable, 1-6
Termination, 50-ohm
feedthrough, 1-6
Travel Case, 1-5
Troubleshooting, 3-17
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Download PDF
Similar pages