Tektronix AM 503 Series Manual

Tektronix AM 503 Series Manual
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Instruction Manual
AM 503B & AM 5030
AC/DC Current Probe Amplifiers
070-8766-05
This document applies for firmware version 3.0
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 the Safety Summary prior to
performing service.
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Copyright Tektronix, Inc. 1994. All rights reserved. Licensed software products are owned by Tektronix or its suppliers
and are protected by United States copyright laws and international treaty provisions.
Use, duplication, or disclosure by the Government is subject to restrictions as set forth in subparagraph (c)(1)(ii) of the
Rights in Technical Data and Computer Software clause at DFARS 252.227-7013, or subparagraphs (c)(1) and (2) of the
Commercial Computer Software – Restricted Rights clause at FAR 52.227-19, as applicable.
Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes
that in all previously published material. Specifications and price change privileges reserved.
Printed in the U.S.A.
Tektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070–1000
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
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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.
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; or c) 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 THIS PRODUCT IN LIEU OF ANY
OTHER WARRANTIES, EXPRESSED 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.
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EC Declaration of Conformity
We
Tektronix Holland N.V.
Marktweg 73A
8444 AB Heerenveen
The Netherlands
declare under sole responsibility that the
AM503B Current Probe Amplifier
meet the intent of Directive 89/336/EEC for Electromagnetic Compatibility.
Compliance was demonstrated to the following specifications as listed in the Official
Journal of the European Communities:
EN 50081-1 Emissions:
EN 55022
Class B Radiated and Conducted Emissions
EN 60555-2
AC Power Line Harmonic Emissions
EN 50082-1 Immunity:
IEC 801-2
Electrostatic Discharge Immunity
IEC 801-3
RF Electromagnetic Field Immunity
IEC 801-4
Electrical Fast Transient/Burst Immunity
IEC 801-5
Power Line Surge Immunity
This product complies when installed into the following Tektronix instrument
enclosure:
TM502A Power Supply
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EC Declaration of Conformity
We
Tektronix Holland N.V.
Marktweg 73A
8444 AB Heerenveen
The Netherlands
declare under sole responsibility that the
AM5030 and AM5030S Current Probe Amplifiers
meet the intent of Directive 89/336/EEC for Electromagnetic Compatibility.
Compliance was demonstrated to the following specifications as listed in the Official
Journal of the European Communities:
EN 55011
Class B Radiated and Conducted Emissions
EN 50081-1 Emissions:
EN 60555-2
AC Power Line Harmonic Emissions
EN 50082-1 Immunity:
IEC 801-2
Electrostatic Discharge Immunity
IEC 801-3
RF Electromagnetic Field Immunity
IEC 801-4
Electrical Fast Transient/Burst Immunity
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Table of Contents
General Safety Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Safety Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ix
xiii
xv
Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1–1
Customer Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AM 503B and AM 5030 System Configuration . . . . . . . . . . . . . . . . . . . . . . . . .
Standard Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing the TM Series Power Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing the AM 503B or AM 5030 Into the Power Module . . . . . . . . . . . . . . .
Connecting the Amplifier to an Oscilloscope . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting a Current Probe to the Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . .
1–1
1–2
1–3
1–3
1–4
1–5
1–7
1–8
Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–1
Operating the Current Probe Slide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Degaussing and Autobalancing the Current Probe . . . . . . . . . . . . . . . . . . . . . . .
DC Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AC Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–1
2–2
2–3
2–4
Control Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–7
AM 503B and AM 5030 Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AM 5030 GPIB Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–8
2–12
GPIB Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–13
GPIB Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting the GPIB Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Other Documents You Will Need . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–14
2–14
2–15
Functional Command Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–17
Front Panel Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GPIB Status Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Amplifier Status Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Probe Status Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–17
2–18
2–18
2–19
Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–21
ALLEve? (Query Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AMPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BWLIMit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COUpling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DCLEVel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DEGAuss (No Query Form) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ERRor? (Query Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EVent? (Query Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EXit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FPLock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–21
2–21
2–22
2–22
2–23
2–23
2–24
2–24
2–24
2–25
Getting Started
Operating Basics
AM 503B & AM 5030 Amplifier Instruction Manual
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i
Contents
HELp? (Query Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ID? (Query Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INIT (No Query Form) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OVerload? (Query Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PATH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PROBEOPen? (Query Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PROBETRim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PROBETYpe? (Query Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RQS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SERIAL? (Query Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SET? (Query Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TEST (No Query Form) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
UNIts? (Query Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–25
2–26
2–26
2–26
2–27
2–27
2–28
2–29
2–29
2–30
2–30
2–31
2–31
Error Messages & Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–33
Reference Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–1
Degaussing a Probe with an Unpowered Conductor in the Jaws . . . . . . . . . . . . .
Bandwidth Limiting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Measuring Differential Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AC and DC Coupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Current Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Extending Current Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Increasing Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–1
3–2
3–2
3–3
3–4
3–5
3–7
Application Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–9
Automobile Charging Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inductance Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuity Test of Multiple-Conductor Cable . . . . . . . . . . . . . . . . . . . . . . . . . . .
Measuring Inductor Turns Count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–9
3–11
3–14
3–14
Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–17
3–19
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4–1
Warranted Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Nominal and Typical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Environmental Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4–2
4–2
4–4
Reference
Specifications
Performance Verification
ii
Performance Verification Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5–1
Test Procedure Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Equipment Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warranted Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5–1
5–1
5–2
Performance Verification with an A6312 . . . . . . . . . . . . . . . . . . . . . . .
5–3
Required Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rise Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Gain Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5–3
5–5
5–7
5–9
AM 503B & AM 5030 Amplifier Instruction Manual
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Contents
Performance Verification with an A6302 or A6302XL . . . . . . . . . . . .
5–15
Required Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rise Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Gain Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5–15
5–17
5–19
5–21
Performance Verification with an A6303 or A6303XL . . . . . . . . . . . .
5–27
Required Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rise Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Gain Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5–27
5–28
5–30
5–32
Performance Verification with an A6304XL . . . . . . . . . . . . . . . . . . . .
5–37
Required Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rise Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Gain Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5–37
5–38
5–40
5–40
Adjustment Procedures
Adjustment Procedures for Current Probes . . . . . . . . . . . . . . . . . . . . .
A6312, A6302 and A6302XL Adjustment . . . . . . . . . . . . . . . . . . . . . . .
6–1
6–3
Required Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A6312, A6302 and A6302XL DC Offset Adjustment . . . . . . . . . . . . . . . . . . . . .
6–3
6–3
A6303 and A6303XL Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6–7
Required Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A6303 and A6303XL DC Offset Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . .
A6303 and A6303XL Transient Response and Gain Adjustment . . . . . . . . . . . .
6–7
6–8
6–10
A6304XL Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6–13
Required Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A6304XL DC Offset Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Gain Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A6304XL Transient Response Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6–13
6–14
6–16
6–18
Customer Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7–1
Service Strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7–1
7–1
Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7–3
Static Device Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Panel Knobs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Side Covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Panel and Release Lever Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Panel Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Rear Interface Output Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7–3
7–4
7–4
7–4
7–7
7–8
7–10
Maintenance
Replaceable Mechanical Parts
Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8–1
Parts Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Replaceable Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8–1
8–1
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Contents
Glossary and Index
iv
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Contents
List of Figures
Figure 1–1: Configuring the AM 503B and AM 5030 Current
Measurement System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–2: TM Series Power Module Voltage Selector . . . . . . . . . . .
Figure 1–3: Changing the TM 502A Operating Voltage . . . . . . . . . . .
Figure 1–4: Installing the AM 503B and AM 5030 into the
Power Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–5: Connecting a Current Probe to the Amplifier . . . . . . . . .
1–2
1–4
1–5
1–6
1–8
Figure 2–1: A6312, A6302, and A6302XL Slide Operation . . . . . . . . .
Figure 2–2: A6303, A6303XL, and A6304XL Slide Operation . . . . . .
Figure 2–3: Current Probe Polarity . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–4: The AM 503B and AM 5030 Front Panel . . . . . . . . . . . . .
Figure 2–5: Stacked GPIB Connectors . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–6: Typical GPIB Network Configurations . . . . . . . . . . . . . .
2–1
2–2
2–4
2–7
2–13
2–14
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: Increasing the DC Measurement Range . . . . . . . . . . . . . .
Figure 3–5: Increasing Probe Sensitivity . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–6: Setup for Measuring Charging Current . . . . . . . . . . . . . .
Figure 3–7: Charge Current Waveforms . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–8: Measuring Inductance with a Low-Impedance Source . .
Figure 3–9: Linear Current vs. Time Ramp . . . . . . . . . . . . . . . . . . . . .
Figure 3–10: Measuring Inductance with a High-Impedance Source
Figure 3–11: High-Impedance Source Current Ramp . . . . . . . . . . . . .
Figure 3–12: Measuring the Number of Turns in a Coil . . . . . . . . . . .
Figure 3–13: Turns Measurement Using Reference Coil . . . . . . . . . . .
3–2
3–3
3–5
3–6
3–7
3–10
3–10
3–11
3–12
3–13
3–13
3–14
3–15
Figure 5–1: Bandwidth Test Setup for A6312 . . . . . . . . . . . . . . . . . . . .
Figure 5–2: Rise Time Test Setup for A6312 . . . . . . . . . . . . . . . . . . . .
Figure 5–3: DC Gain Accuracy Test Setup for A6312 . . . . . . . . . . . . .
Figure 5–4: Bandwidth Test Setup for A6302/A6302XL . . . . . . . . . . .
Figure 5–5: Rise Time Test Setup for A6302/A6302XL . . . . . . . . . . . .
Figure 5–6: DC Gain Accuracy Test Setup for A6302/A6302XL . . . .
Figure 5–7: Bandwidth Test Setup for an A6303/A6303XL . . . . . . . .
5–5
5–7
5–10
5–17
5–19
5–22
5–28
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Contents
vi
Figure 5–8: Rise Time Test Setup for A6303/A6303XL . . . . . . . . . . . .
Figure 5–9: DC Gain Accuracy Test Setup for A6303/A6303XL . . . .
Figure 5–10: Rise Time Test Setup for the A6304XL . . . . . . . . . . . . . .
Figure 5–11: DC Gain Accuracy Test Setup for the A6304XL . . . . . .
5–30
5–33
5–38
5–41
Figure 6–1: A6312, A6302 and A6302XL DC Offset Adjustment
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–2: A6303 and A6303XL Adjustment Locations . . . . . . . . . .
Figure 6–3: A6303 and A6303XL Adjustment Setup . . . . . . . . . . . . . .
Figure 6–4: A6304XL Adjustment Locations . . . . . . . . . . . . . . . . . . . .
Figure 6–5: DC Gain Accuracy Adjustment Setup . . . . . . . . . . . . . . .
Figure 6–6: A6304XL Adjustment Setup . . . . . . . . . . . . . . . . . . . . . . .
6–3
6–8
6–11
6–15
6–17
6–18
Figure 7–1: Removing the AM 503B and AM 5030 Side Covers . . . .
Figure 7–2: Removing the Amplifier Release Lever . . . . . . . . . . . . . .
Figure 7–3: Location of Amplifier Interface Cables . . . . . . . . . . . . . .
Figure 7–4: Location of Front Panel Screws . . . . . . . . . . . . . . . . . . . . .
Figure 7–5: Removing the Latch Bar Assembly . . . . . . . . . . . . . . . . . .
Figure 7–6: Removing the Amplifier Output Connector . . . . . . . . . . .
Figure 7–7: Removing the Amplifier Front Panel Board . . . . . . . . . .
Figure 7–8: Using the Rear Interface Output Connector . . . . . . . . . .
Figure 7–9: Prying Battery Terminal to Remove Battery . . . . . . . . . .
Figure 7–10: Removing the Backup Battery . . . . . . . . . . . . . . . . . . . . .
Figure 7–11: Replacing the Backup Battery . . . . . . . . . . . . . . . . . . . . .
7–4
7–5
7–5
7–6
7–6
7–7
7–8
7–9
7–10
7–10
7–11
Figure 8–1: AM 503B & AM 5030 Replaceable Parts . . . . . . . . . . . . .
Figure 8–2: AM 503B & AM 5030 Standard Accessories . . . . . . . . . .
8–3
8–6
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Contents
List of Tables
Table 2–1: Front Panel Commands . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2–2: GPIB Status Commands . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2–3: Amplifier Status Commands . . . . . . . . . . . . . . . . . . . . . . .
Table 2–4: Probe Status Commands . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2–5: AM 5030 Event Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3–1: Unpowered Circuit Degauss Limits . . . . . . . . . . . . . . . . . .
Table 3–2: Automobile Charging Systems Test Setup . . . . . . . . . . . . .
Table 3–3: AM 503B and AM 5030 Front-Panel Error Codes . . . . . .
Table 3–4: Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 4–1: Warranted AM 503B and AM 5030 Specifications . . . . .
Table 4–2: Nominal and Typical AM 503B and AM 5030
Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 4–3: AM 503B and AM 5030 Mechanical Characteristics . . . .
Table 4–4: AM 503B and AM 5030 Environmental Characteristics .
Table 5–1: Required Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 5–2: Equipment Settings for Bandwidth . . . . . . . . . . . . . . . . . .
Table 5–3: Equipment Settings for Rise Time . . . . . . . . . . . . . . . . . . .
Table 5–4: Equipment Settings for DC Gain Accuracy . . . . . . . . . . .
Table 5–5: DC Gain Accuracy Test for A6312 . . . . . . . . . . . . . . . . . . .
Table 5–6: DC Gain Accuracy Test Worksheet for A6312 . . . . . . . . .
Table 5–7: Required Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 5–8: Equipment Settings for Bandwidth . . . . . . . . . . . . . . . . . .
Table 5–9: Equipment Settings for Rise Time . . . . . . . . . . . . . . . . . . .
Table 5–10: Equipment Settings for DC Gain Accuracy . . . . . . . . . .
Table 5–11: DC Gain Accuracy Test for A6302/A6302XL . . . . . . . . .
Table 5–12: DC Gain Accuracy Test Worksheet for A6302/A6302XL
Table 5–13: Required Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . .
Table 5–14: Equipment Settings for Bandwidth . . . . . . . . . . . . . . . . .
Table 5–15: Equipment Settings for Rise Time . . . . . . . . . . . . . . . . . .
Table 5–16: Equipment Settings for DC Gain Accuracy . . . . . . . . . .
Table 5–17: DC Gain Accuracy Test for A6303/A6303XL . . . . . . . . .
Table 5–18: DC Gain Accuracy Test Work Sheet for
A6303/A6303XL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 5–19: Required Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . .
Table 5–20: Equipment Settings for Rise Time . . . . . . . . . . . . . . . . . .
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2–17
2–18
2–18
2–19
2–33
3–1
3–9
3–18
3–19
4–2
4–2
4–3
4–4
5–4
5–5
5–8
5–10
5–11
5–13
5–16
5–17
5–20
5–22
5–23
5–25
5–27
5–29
5–31
5–32
5–34
5–36
5–37
5–39
vii
Contents
Table 5–21: Equipment Settings for DC Gain Accuracy . . . . . . . . . .
Table 5–22: DC Gain Accuracy Test for the A6304XL . . . . . . . . . . . .
Table 5–23: DC Gain Accuracy Test Work Sheet for the A6304XL .
Table 6–1: Required Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 6–2: Settings for DC Offset Adjustment . . . . . . . . . . . . . . . . . .
Table 6–3: Error Codes Requiring DC Offset Adjustment . . . . . . . .
Table 6–4: Required Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 6–5: Settings for DC Offset Adjustment . . . . . . . . . . . . . . . . . .
Table 6–6: Error Codes Requiring DC Offset Adjustment . . . . . . . .
Table 6–7: Settings for Transient Response and Gain Adjustments .
Table 6–8: Required Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 6–9: Settings for DC Offset Adjustment . . . . . . . . . . . . . . . . . .
Table 6–10: Error Codes Requiring DC Offset Adjustment . . . . . . .
Table 6–11: Equipment Settings for DC Gain Accuracy . . . . . . . . . .
Table 6–12: Equipment Settings for Transient Response . . . . . . . . . .
viii
5–41
5–43
5–44
6–3
6–4
6–5
6–7
6–9
6–9
6–11
6–13
6–14
6–15
6–16
6–18
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General Safety Summary
Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it.
Only qualified personnel should perform service procedures.
While using this product, you may need to access other parts of the system. Read
the General Safety Summary in other system manuals for warnings and cautions
related to operating the system.
Injury Precautions
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.
Do Not Operate Without
Covers
To avoid electric shock or fire hazard, do not operate this product with covers or
panels removed.
Do Not Operate in
Wet/Damp Conditions
Do Not Operate in
Explosive Atmosphere
Avoid Exposed Circuitry
To avoid electric shock, do not operate this product in wet or damp conditions.
To avoid injury or fire hazard, do not operate this product in an explosive
atmosphere.
To avoid injury, remove jewelry such as rings, watches, and other metallic
objects. Do not touch exposed connections and components when power is
present.
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ix
General Safety Summary
Product Damage Precautions
Use Proper Power Source
Use Proper Voltage
Setting
Provide Proper Ventilation
Do Not Operate With
Suspected Failures
Do not operate this product from a power source that applies more than the
voltage specified.
Before applying power, ensure that the line selector is in the proper position for
the power source being used.
To prevent product overheating, provide proper ventilation.
If you suspect there is damage to this product, have it inspected by qualified
service personnel.
Safety Terms and Symbols
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.
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.
x
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General Safety Summary
Symbols on the Product
The following symbols may appear on the product:
DANGER
High Voltage
Protective Ground
(Earth) Terminal
ATTENTION
Refer to Manual
Double
Insulated
Certifications and Compliances
CSA Certified Power
Cords
CSA Certification includes the products and power cords appropriate for use in
the North America power network. All other power cords supplied are approved
for the country of use.
Safety Certification of
Plug-in Modules
For plug-in modules that are safety certified by Underwriters Laboratories, UL
Listing applies only when the module is installed in a UL Listed product. CSA
Certification applies only when the module is installed in a CSA Certified
product.
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General Safety Summary
xii
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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
Disconnect Power
Use Care When Servicing
With Power On
Do not perform internal service or adjustments of this product unless another
person capable of rendering first aid and resuscitation is present.
To avoid electric shock, disconnect the main power by means of the power cord
or, if provided, the power switch.
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.
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Service Safety Summary
xiv
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Preface
This Instruction Manual supports the operation and basic maintenance of the
AM 503B and AM 5030 Current Probe Amplifiers.
If you are not familiar with this product, 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.
NOTE. Except for the A6303, once a probe has been calibrated, it can be used
with any other AM 503B or AM 5030 without readjustment.
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.
Related Manuals
You can find the documentation supporting the maintenance and repair of the
current probes in the following manuals:
H
A6312 Instructions
H
A6302 & A6302XL Instructions
H
A6303 & A6303XL Instructions
H
A6304XL Instructions
Manual Conventions
The term “Amplifier” is used to refer to either the AM 503B or AM 5030 when
referring to common attributes. If a subject is unique to either amplifier, the
amplifier will be referred to directly by model.
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Preface
xvi
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Getting Started
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Getting Started
The AM 503B and AM 5030 current probe amplifiers let you use one probe to
simultaneously measure AC and DC current. The Amplifier converts the sensed
current into a proportional voltage signal that you can measure directly with an
oscilloscope.
The AM 503B and AM 5030 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 Amplifier to
accurately represent square waves and fast-rise signals.
The AM 503B and AM 5030 provide these features:
H
Simultaneous DC and AC current measurements.
H
High sensitivity.
H
One-button autobalancing and probe degaussing.
H
No adjustments needed to match a current probe to an individual amplifier
(except for the A6303 current probe).
H
Probe trim adjust allows fine tuning of gain for increased accuracy.
The AM 5030 provides an additional feature:
H
Programmable control from a GPIB controller.
Customer Support
To help you get the best performance from your Amplifier, Tektronix offers the
following customer support services.
Operational Support
If you need assistance operating your amplifier system, please call our Customer
Support Center at 1-800-TEK-WIDE (1-800-835-9433), extension 2400. If you
are outside the United States or Canada, please contact your nearest Tektronix
Service Center.
Service Support
Should your Amplifier system need repair beyond that described in this manual,
please contact your nearest Tektronix Service Center.
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1–1
Getting Started
Sales Support
To order optional equipment and accessories, call the Tektronix National
Marketing Center at 1-800-426-2200. If you are outside the United States or
Canada, please contact your nearest Tektronix Service Center.
AM 503B and AM 5030 System Configuration
A complete AM 503B or AM 5030 current measurement system consists of a
current probe amplifier, a compatible current probe, a TM 500 or TM 5000 series
power module, and an appropriate oscilloscope. Refer to Figure 1–1.
Amplifier in TM Series
Power Module
Test Oscilloscope
Current Probe
Output
Input
50 oscilloscope input (or add 50 termination here if oscilloscope has
only high-impedance input).
Figure 1–1: Configuring the AM 503B and AM 5030 Current Measurement System
AM 503B & AM 5030
Current Probe Amplifier
The AM 503B is a single-width instrument that plugs into any Tektronix
TM 500 or TM 5000 series power module. The AM 5030 is a single-width
instrument that plugs into any Tektronix TM 5000 series power module. 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.
Current Probes
The AM 503B and AM 5030 systems may be used with the following Tektronix
probes:
H
A6312 (20 amps)
H
A6302 and A6302XL (20 amps)
H
A6303 and A6303XL (100 amps)
H
A6304XL (500 amps)
You can also use the CT-4 High-Current Transformer with the A6312, A6302,
and A6302XL current probes to extend their AC current measurement range to
20,000 peak amps.
1–2
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Getting Started
TM 500 Series Power
Modules
The AM 503B operates in a Tektronix TM 500 or TM 5000 series power module
that powers one or more TM 500 series instruments. The Power Module operates
on either 110 or 220 VAC, 50 or 60 Hz.
TM 5000 Series Power
Module
The AM 5030 operates in a Tektronix TM 5000 series power module that powers
one or more TM 5000 series instruments while providing GPIB support. The
Power Module operates on either 110 or 220 VAC, 50 or 60 Hz.
Oscilloscope
An oscilloscope displays the output from the current measuring system. A 50 cable is included to connect the Amplifier to the oscilloscope input channel.
If the oscilloscope does not have an input that can be set to 50 impedance, you
need a feedthrough 50 termination. This termination is included as a standard
accessory with your AM 503B and AM 5030 Current Probe Amplifier.
Standard Accessories
These accessories are shipped with either the AM 503B or AM 5030:
H
50 coaxial cable
H
50 feedthrough termination
H
Instruction Manual
H
Reference card
If you ordered an AM 503S system, you will have received these items:
H
AM 503B
H
Current Probe (specific probe type depends on option ordered with the
Amplifier)
H
TM 502A Power Module
H
Toolbox
H
AC Power cord
Optional Accessories
You can order the following optional accessories for the AM 503B and
AM 5030 Current Probe Amplifiers. Refer to the Replaceable Parts List on page
8–6 for Tektronix part numbers to use in ordering these accessories.
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1–3
Getting Started
H
One-turn 50 current loop. The current loop is used in the performance
verification procedure for checking the performance of the AM 503B and
AM 5030.
H
If you need to measure high-amplitude AC currents, consider using a
Tektronix CT-4 High-Current Transformer with the A6312, A6302, or
A6302XL 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.
Installing the TM Series Power Module
If you ordered your current probe amplifier as a part of a system, a power
module will have been provided. Follow these instructions for the proper setup
and installation of the power module.
The TM Series Power Module can operate from one of four AC line voltages.
The operating voltage is determined by the voltage selector, located on the rear
panel of the TM Series Power Module, as shown in Figure 1–2.
WARNING. To avoid personal injury or equipment damage, do not connect the
power module to the AC line receptacle or turn the power module on until you
have verified that the proper operating voltage is selected.
Voltage Selector
Selector Window
Latch
TM Series
Power Module
Figure 1–2: TM Series Power Module Voltage Selector
1–4
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Getting Started
The value displayed in the voltage selector window should match the value of
your line voltage. If the two values don’t match, perform these steps to select the
correct value:
1. Push up on the latch and pull the voltage selector assembly out.
2. Disassemble the voltage selector as shown in Figure 1–3.
3. Rotate the fuse block until the proper voltage appears in the window.
4. Reassemble the voltage selector and push it back into the power module
until it snaps into place.
5. Using the correct power cord, connect the power module to the AC line
receptacle.
Rotate fuse block so that
the correct voltage
appears in the window
Fuse
Fuse Block
Selector Window
Figure 1–3: Changing the TM 502A Operating Voltage
Installing the AM 503B or AM 5030 Into the Power Module
CAUTION. Make sure the power switch of the power module is turned off before
installing the Amplifier. If you install or remove a plug-in instrument while the
power module is on, you could damage the power module, the Amplifier, or the
current probe.
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1–5
Getting Started
CAUTION. Do not attempt to install an AM 5030 amplifier into a TM 500 series
power module. The backplane connector scheme is different, and damage to the
amplifier will result.
To install the Amplifier into the power module, align the grooves of the
Amplifier with the rails of the power module and push the Amplifier into the
power module until the instrument snaps into place (see Figure 1–4). To remove
the Amplifier, grasp the release lever at the lower left corner of the Amplifier
front panel and pull the Amplifier out of the power module.
Slide instrument into
power module
Release Lever
Figure 1–4: Installing the AM 503B and AM 5030 into the Power Module
After you have installed the Amplifier and all other desired plug-in instruments
into the power module, you may turn the power module on. A digital readout
should appear on the Amplifier front panel and a coupling light should come on.
See Figure 2–4 on page 2–7 for the location of the coupling lights.
NOTE. When the AM 5030 is not connected to a GPIB controller, the SRQ light is
normally on.
1–6
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Getting Started
Connecting the Amplifier to an Oscilloscope
You will need an oscilloscope to display the AM 503B and AM 5030 measurement output. The oscilloscope must be capable of displaying a vertical scale
factor of 10 mV/div.
Use the supplied 50 BNC cable to connect the Amplifier OUTPUT connector
to your oscilloscope (see Figure 1–1 on page 1–2).
The input impedance of the oscilloscope channel must be 50 , otherwise you
will encounter slowed pulse response, increased aberrations, or incorrect DC
measurement amplitudes. If your oscilloscope provides only 1 M inputs, you
need to attach a 50 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 AM 503B and AM 5030 and
attached current probe, the oscilloscope bandwidth should be approximately five
times that of the current probe. For example, when using an A6312 Current
Probe, the oscilloscope bandwidth should be at least 500 MHz. When using an
A6302 Current Probe, the oscilloscope bandwidth should be at least 250 MHz.
After you have connected the Amplifier to the oscilloscope, make the following
adjustments to the oscilloscope channel you are using. Perform these adjustments only after all equipment has warmed up to a stable temperature; usually
20 minutes are required.
1. Make sure the oscilloscope input impedance is 50 . If your oscilloscope
provides only 1 M inputs, you need to attach a 50 feedthrough
termination between the oscilloscope input and the BNC cable. Do not
install this termination at the AM 503B and AM 5030 end of the BNC cable.
2. Set the vertical gain of the oscilloscope to 10 mV/div.
3. Set the oscilloscope ground reference so the trace appears at the center
graticule line or at the desired zero-current reference.
4. Set the input coupling of the oscilloscope to DC.
5. Turn off any oscilloscope bandwidth filters.
Once you have set up the oscilloscope, you do not need to further adjust the
oscilloscope vertical controls while you are using the AM 503B and AM 5030.
Use the oscilloscope controls to adjust the time base or trigger settings only.
NOTE. To maintain accurate readings while using the AM 503B and AM 5030,
the vertical gain of the oscilloscope channel must always remain at 10 mV/Div
and the coupling must remain at DC.
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1–7
Getting Started
Connecting a Current Probe to the Amplifier
To connect a current probe to the Amplifier input connector, align the tab of the
probe connector with the slot in the Amplifier INPUT connector as shown in
Figure 1–5(a). Align the dot on the probe connector with the groove opening of
the input connector as shown in Figure 1–5(b). Push the probe connector in
while twisting the barrel clockwise to lock the connector.
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 while the AM 503B and
AM 5030 is powered on, or the probe may suffer electrical damage.
Amplifier
Push connector in
and twist to lock
Current Probe Connector
Current Probe
Connector
Tab
Amplifier
Slot
(a) Align the Tab With the Connector Slot
Groove
Alignment Dot
(b) Insert the Connector Into the Amplifier
Figure 1–5: Connecting 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, refer to the Adjustment
Procedure on page 6–1 or contact your nearest Tektronix Service Center. The
adjustment procedure should be performed only by qualified service personnel.
1–8
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Operating Basics
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Measurements
This section provides operating techniques and measurement procedures for
using the AM 503B and AM 5030-compatible current probes.
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. When the probe slides are open, the exposed ferrite core pieces are
not insulated. To avoid injury or equipment damage, remove power from an
uninsulated wire before clamping the current probe around it.
Figure 2–1 illustrates the slide operation of the A6312, A6302, and A6302XL
current probes. 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.
Probe Open
Probe Locked
Figure 2–1: A6312, A6302, and A6302XL Slide Operation
Figure 2–2 illustrates the slide operation of the A6303, A6303XL, and A6304XL
current probes. 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.
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2–1
Measurements
(2) Lock the probe
(1) Unlock the probe
(1) Release the handle
(2) Squeeze
the handle
(a) Opening the Probe
(b) Closing and Locking the Probe
Figure 2–2: A6303, A6303XL, and A6304XL 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 probe is a leading cause of measurement errors. To
maintain measurement accuracy, degauss your probe in each of these cases:
2–2
H
After turning on the Amplifier and allowing a 20-minute warm-up period.
H
Before connecting the probe to a conductor or changing conductors under
test.
H
Whenever an overload condition occurs.
H
Whenever the probe is subjected to a strong external magnetic field.
H
Periodically during normal use.
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Measurements
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 Figures 2–1 and 2–2).
4. Press the Amplifier PROBE DEGAUSS AUTOBALANCE button.
NOTE. The degauss procedure will fail if the Amplifier is not properly connected
to an oscilloscope having 50 input impedance. If this occurs, an error code of
266 will be displayed 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.
DC Measurements
To measure DC current, perform these steps:
1. Verify that the vertical gain of the oscilloscope is 10 mV/div, the input
coupling is DC, and the input impedance is set to 50 .
2. Adjust the ground reference of the oscilloscope to move the trace to the
desired graticule line.
NOTE. Once the first two steps have been completed, no further adjustments are
required on the oscilloscope vertical amplifier during the measurement session.
Use the Amplifier controls for everything except time base and trigger adjustment. See Figure 2–4.
3. Lock the probe closed without a conductor passing through it. Press the
Amplifier COUPLING button repeatedly until the REF light comes on, and
then press the Amplifier PROBE DEGAUSS AUTOBALANCE button.
4. After the degauss/autobalance routine completes, adjust the ground reference
(if necessary) using the Amplifier OUTPUT DC LEVEL control.
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 display the current waveform upsidedown on the oscilloscope.
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2–3
Measurements
6. Press the Amplifier COUPLING button repeatedly until the DC light comes
on. Set the Amplifier CURRENT/DIVISION to the desired setting using
the and buttons.
7. If necessary, vertically position the resulting waveform using the OUTPUT
DC LEVEL knob of the Amplifier.
8. Adjust the oscilloscope time base and trigger as needed.
Figure 2–3 shows a current probe connected to a power supply line. 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 (–).
Power Supply
Load
Current Probe
Conventional Current Arrow
Figure 2–3: 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 6 is set
to AC.
1. Verify that the vertical gain of the oscilloscope is 10 mV/div, the input
coupling is DC, and the input impedance is set to 50 .
2. Adjust the ground reference of the oscilloscope to move the trace to the
desired graticule line.
NOTE. Once the first two steps have been completed, no further adjustments are
required on the oscilloscope vertical amplifier during the measurement session.
Use the Amplifier controls for everything but time base and trigger adjustment.
2–4
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Measurements
3. Lock the probe closed without a conductor passing through it. Press the
Amplifier COUPLING button repeatedly until the REF light comes on, and
then press the Amplifier PROBE DEGAUSS AUTOBALANCE button.
4. After the degauss/autobalance routine completes, adjust the ground reference
(if necessary) using the Amplifier OUTPUT DC LEVEL control.
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.
6. Press the Amplifier COUPLING button repeatedly until the AC light comes
on. Set the Amplifier CURRENT/DIVISION to the desired setting using
the and buttons.
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.
7. If necessary, vertically position the resulting waveform using the OUTPUT
DC LEVEL knob of the Amplifier.
8. Adjust the oscilloscope time base and trigger as needed.
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2–5
Measurements
2–6
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Control Summary
This section describes the function of each AM 503B and AM 5030 front panel
control and connector. The overview in Figure 2–4 is followed by a detailed
description.
Some seldom-used functions do not appear in Figure 2–4. These functions are
completely discussed in the detailed descriptions that follow Figure 2–4.
The OUTPUT DC LEVEL knob
vertically positions the signal on the
oscilloscope screen.
The CURRENT/DIVISION display shows the
current AM 503B and AM 5030 scale factor in
either mA/division or A/division. Error codes
and output DC level also appear here.
The 20 MHz BW LIMIT button alternately
selects or deselects the 20 MHz bandwidth
limit for noise filtering.
Hold down the GPIB ADDRESS button while
adjusting the CURRENT/DIVISION buttons to
change the GPIB address. (AM 5030 only.)
The AM 503B and AM 5030 output appears at
the OUTPUT connector. Connect this to a 50 input of your oscilloscope.
The two indicator lights: PROBE OPEN and
OVERLOAD give you local status information.
The two indicator lights: SRQ and REMOTE
give you remote status information. (AM 5030
only.)
The PROBE DEGAUSS AUTOBALANCE button
removes residual magnetism from the attached
current probe. The probe must be removed from
the test circuit and locked.
The CURRENT/DIVISION buttons change the
AM 503B and AM 5030 scale factor.
The COUPLING button selects AC or DC probe
coupling or a zero-current reference, as
indicated by the lights.
The current probes connect to the AM 503B and
AM 5030 at the INPUT connector.
Pull the release lever to remove the AM 503B and
AM 5030 from the power module.
Figure 2–4: The AM 503B and AM 5030 Front Panel
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2–7
Control Summary
AM 503B and AM 5030 Controls
These front panel controls and indicators are common to both the AM 503B and
AM 5030 current probe amplifiers.
OUTPUT DC LEVEL
Control
The OUTPUT DC LEVEL knob adjusts the DC offset that appears at the
Amplifier OUTPUT connector. The OUTPUT DC LEVEL knob adjusts the
displayed waveform relative to ground. After setting a zero-current reference, do
not use the oscilloscope vertical position to move the waveform up and down on
the display; use the Amplifier OUTPUT DC LEVEL knob instead.
As you adjust the OUTPUT DC LEVEL knob, the display shows you the output
level in divisions. When you stop moving the OUTPUT DC LEVEL knob, the
display reverts to show current per division.
The PROBE DEGAUSS AUTOBALANCE button will change the output DC
level setting if the Amplifier coupling is set to REF. In this case only, the output
DC level setting will be reset to ground; otherwise, the DC level setting will
remain at its previous setting.
NOTE. To maintain measurement accuracy, position the signal with the AM 503B
and AM 5030 ! PROBE OPEN Indicator
When lit, this indicator informs you that the current probe is unlocked. You must
have the probe slide locked in order to degauss the probe or to accurately
measure current.
OVERLOAD Indicator
When lit, this indicator informs you that the measurement you are taking exceeds
the continuous amplitude limit of the AM 503B and AM 5030. The detection
circuits only detect low frequency (≈10 kHz) and DC overloads. Since overloads
can magnetize the probe, you should always degauss the probe after an overload.
WARNING. To avoid personal injury or equipment damage, do not exceed the
specified electrical limits of the AM 503B and AM 5030 or any applicable
accessories.
PROBE DEGAUSS
AUTOBALANCE Button
2–8
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 its circuitry. During the
degauss process, the Amplifier is busy and cannot be used to measure current.
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Control Summary
The indicator light in the PROBE DEGAUSS AUTOBALANCE button will
blink whenever the Amplifier detects that the current probe needs degaussing or
DC balancing. 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. The blinking light serves as
a reminder to degauss the current probe when one of the following conditions
occurs:
H
The Amplifier has just been turned on with a current probe connected.
H
The current probe has been changed.
H
The internal temperature of the Amplifier changed by more than 10° C.
H
An overload has occurred.
The indicator stays on steady during the time the Amplifier is busy performing
the probe degauss functions. When the degauss and autobalance procedure is
complete, the indicator light turns off.
To perform the probe degauss/autobalance function, remove the probe from
around 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 work if the current probe is
unlocked or disconnected from the Amplifier input. To properly degauss the
current probe, remove it from the conductor under test and lock the probe.
If the PROBE DEGAUSS AUTOBALANCE button is pressed while the
coupling is set to REF, the Output DC level is reset to ground. If either AC or
DC coupling is selected when the PROBE DEGAUSS AUTOBALANCE button
is pressed, the DC level is not changed from its previous setting.
NOTE. The Amplifier displays error code 266 when the Amplifier output is not
properly terminated into a 50 load. Make sure your Amplifier OUTPUT is
connected to an oscilloscope input using a 50 BNC cable, and that the
oscilloscope input is set to 50 impedance. See Figure 1–1 on page 1–2 for
proper cabling.
If your oscilloscope does not have 50 impedance settings for inputs, you can
place a 50 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.
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2–9
Control Summary
CURRENT/DIVISION
Buttons
The CURRENT/DIVISION and buttons set the scale factor (sensitivity) of
the AM 503B and AM 5030 in a 1–2–5 sequence. The setting of this control is
displayed on the digital readout and the units indicator. The CURRENT/DIVISION display indicates the Amplifier scale factor only; it is not a current
measurement readout. The measurement output is displayed on the oscilloscope.
NOTE. To maintain accurate measurements, the vertical gain of the oscilloscope
must remain at 10 mV/div.
COUPLING Button
The COUPLING button determines the coupling between the current probe and
the AM 503B and AM 5030. Press the COUPLING button repeatedly until the
desired indicator lights up. To couple the current probe for DC plus AC
measurements, use DC coupling. For AC measurements only, use AC coupling.
To establish a zero-current reference, use REF coupling. While using REF
coupling, you cannot measure current or view current waveforms.
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.
20 MHz BW LIMIT Button
The 20 MHz BW LIMIT button lets you limit the current probe amplifier
bandwidth to 20 MHz. This can be useful to remove high-frequency noise. Press
the button again to return to full bandwidth. When the button lights, the
bandwidth limit is on. System bandwidth depends on the type of current probe
you are using. Refer to the specifications table on page 4–3 for the bandwidth
limit frequency for your current probe.
Probe Trim Adjust
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, the probe trim adjust routine may be
performed.
Probe trim adjust is a multiplicative factor that you can use to adjust the gain of
the current amplifier system. You can set this multiplier in increments of 0.001
from 0.750 through 1.250. Probe trim adjust is used for an optional calibration of
some current probes. If you are not performing such an adjustment, leave probe
trim adjust to the factory-default of unity gain (1.000).
To set probe trim adjust, press and hold the 20MHz BW LIMIT button while
pressing and releasing the COUPLING button. Use the and buttons to
2–10
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Control Summary
adjust the setting that is displayed in the CURRENT/DIVISION display. When
finished, press either the 20MHz BW LIMIT or COUPLING button to restore
normal operation.
The display shows the last three significant digits of the display adjust setting;
the leading 0. or 1. are omitted. If the first digit displayed is 7, 8, or 9, then the
leading digit must be 0. If the first digit displayed is 0, 1, or 2, then the leading
digit must be 1.
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 BNC cable to this connector and the other end to a 50 vertical input
of your oscilloscope. The output impedance of the Amplifier is 50 .
NOTE. To obtain accurate measurements, the input impedance of your oscilloscope must be 50 . Make sure your Amplifier OUTPUT is connected to an
oscilloscope input using a 50 BNC cable, and that the oscilloscope input is set
to 50 impedance. See Figure 1–1 on page 1–2 for proper cabling.
If your oscilloscope does not have 50 impedance settings for inputs, you can
place a 50 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.
INPUT Connector
All current probes compatible with the AM 503B and AM 5030 attach at the
INPUT connector, which is a 12-pin female connector. For information about
connecting a probe, see Connecting a Current Probe to the AM 503B and
AM 5030 on page 1–8.
CAUTION. To avoid equipment damage, turn the TM Series Power Module off
before removing or installing a current probe.
Release Lever
The release lever has the Tektronix name printed on it. Pull the release lever to
remove the Amplifier from the power module.
CAUTION. To avoid equipment damage, turn the TM Series Power Module off
before removing or installing any plug-in unit.
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2–11
Control Summary
AM 5030 GPIB Controls
These indicators and controls are unique to the AM 5030 and do not appear on
the AM 503B front panel.
SRQ Indicator
When lit, this indicator informs you that the AM 5030 has requested service
from the controller.
REMOTE Indicator
When lit, this indicator informs you that the front panel of the AM 5030 is
temporarily locked out because the Amplifier is responding to a GPIB command
from the controller.
GPIB ADDRESS Indicator
The GPIB ADDRESS button has a light in it. When lit, this indicator informs
you that the AM 5030 has been addressed by the controller and that communication is taking place.
GPIB ADDRESS Button
The GPIB ADDRESS button lets you set the AM 5030 device address. The
GPIB controller must use this address to send commands to the Amplifier. To set
the GPIB address, press and hold the GPIB ADDRESS button and, while
holding it down, use the and buttons to adjust the address that is displayed
in the CURRENT/DIVISION display.
You can set the address from 0 (A00) through 30 (A30). You can also set the
Amplifier off line, which disables all communications with the controller. The
off line setting is A––.
GPIB Terminator
2–12
The GPIB ADDRESS and 20MHz BW LIMIT buttons together let you define
the AM 5030 GPIB terminator. The terminator may be set to EOI only or EOI
followed by LF. To set the GPIB terminator, press and hold the GPIB ADDRESS button, and also press and hold the 20 MHz BW LIMIT button. While
holding them down, use the and buttons to adjust the setting that is
displayed in the CURRENT/DIVISION display. The display shows EOI if the
terminator is EOI only and LF if the terminator is EOI followed by LF.
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GPIB Operation
NOTE. This material applies only to the AM 5030 Programmable Amplifier. The
AM 503B does not support a GPIB interface.
You can use a computer to control the AM 5030 and make measurements. With
an oscilloscope that also can be programmed, the computer and AM 5030 can
form a complete, automated measurement system.
Your computer, also known as the controller, must be capable of operating on a
GPIB bus that conforms to IEEE Std 488.1–1987. GPIB cards are available to
provide this capability for personal computers.
The TM 5000 Series Power Module has a 24-pin GPIB connector on its rear
panel, as shown in Figure 2–5. This connector has a D-type shell and conforms
to IEEE Std 488.1–1987.
Attach an IEEE Std 488.1–1987 GPIB cable (see Optional Accessories in the
Replaceable Mechanical Parts section) between this connector and your
controller. Figure 2–5 also shows how cables can be stacked together. You can
stack a second cable on either the TM 5000 Series Power Module connector or
the controller connector, to similarly connect your oscilloscope.
Figure 2–5: Stacked GPIB Connectors
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2–13
GPIB Operation
GPIB Requirements
Observe these rules when you use your AM 5030 with a GPIB network:
H
Assign a unique device address to each device on the bus. No two devices
can share the same device address.
H
Do not connect more than 15 devices to the bus.
H
Connect one device for every 2 meters (6 feet) of cable used.
H
Do not use more than 20 meters (65 feet) of cable for the entire bus.
H
Turn on at least two-thirds of the devices on the network while using the
network.
H
Connect the devices on the network in a star or linear configuration as shown
in Figure 2–6. Do not use loop or parallel configurations.
GPIB Device
GPIB Device
GPIB Device
GPIB Device
GPIB Device
GPIB Device
GPIB Device
Figure 2–6: Typical GPIB Network Configurations
Setting the GPIB Parameters
You must set the GPIB parameters of the AM 5030 to match the configuration of
the bus and controller.
GPIB Address
The GPIB ADDRESS button lets you set the AM 5030 device address. The
GPIB controller must use this address to send commands to the AM 5030. The
address of the AM 5030 must be different from the addresses used by all other
devices on the bus.
To set the GPIB address, press and hold the GPIB ADDRESS button and, while
holding it down, use the and buttons to adjust the address that is displayed
in the digits. You can set the address from 0 (A00) through 30 (A30). You can
also set the AM 5030 off line, which disables all communications with the
controller. The off line setting is A––.
2–14
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GPIB Operation
GPIB Terminator
Pressing both the GPIB ADDRESS and 20MHz BW LIMIT buttons at the same
time lets you set the AM 5030 GPIB terminator. The terminator may be set to
EOI only or EOI followed by LF. You will need to consult your controller
documentation to determine which setting is best for your configuration.
To set the GPIB terminator, press and hold both the GPIB ADDRESS and
20MHz BW LIMIT buttons and, while holding them down, use the and
buttons to adjust the setting that is displayed in the digits. The display shows
EOI when the terminator is EOI only and LF when the terminator is EOI
followed by LF.
Other Documents You Will Need
We cannot know what type of controller you will use with your AM 5030. This
document cannot cover the topics that are specific to your installation. To
completely understand and implement a GPIB system, you will need the
documentation that supports your controller. If you are using a personal
computer with a GPIB card, you will need the documentation for both the PC
and the GPIB card.
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2–15
GPIB Operation
2–16
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Functional Command Groups
NOTE. This material applies only to the AM 5030 Programmable Amplifier. The
AM 503B does not support a GPIB interface.
The AM 5030 GPIB interface commands fall into four groups:
H
Front panel commands
H
GPIB Status commands
H
Amplifier Status commands
H
Probe Status commands
Command names show both upper- and lower-case characters. Only the
upper-case characters are required. You can abbreviate commands by omitting
lower-case characters, starting from the end. For example, you can enter the
ALLEve command as ALLEVE, ALLEV, or ALLE.
The AM 5030 is not case-sensitive. You can use lower-case letters anyplace in
command names or arguments: alLeVe, AllEv, or alle are valid.
Front Panel Commands
The commands listed in Table 2–1 are used to control or duplicate the front panel
controls and indicators of the AM 5030.
Table 2–1: Front Panel Commands
Command Name
Description
AMPS
Sets output resolution
BWLIMit
Sets or resets bandwidth limiting
COUpling
Sets input coupling
DCLEVel
Adjusts output DC offset (reference) level
DEGAuss
Starts the degauss/autobalance sequence
FPLock
Disables and enables front-panel controls
OVerload?
Returns the state of the overload indicator
UNIts?
Returns units of AM 5030 output
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2–17
Functional Command Groups
GPIB Status Commands
The commands listed in Table 2–2 are used to provide event information and
configure the GPIB interface.
Table 2–2: GPIB Status Commands
Command Name
Description
ALLEve?
Returns all pending event codes
ERRor?
Returns the last pending event code
EVent?
Returns the last pending event code
EXit
Recovers from an error condition
HELp?
Returns a list of AM 5030 GPIB commands
PATH
Sets whether queries return command names
RQS
Enables or disables system requests (SRQs)
SET?
Returns all AM 5030 settings as command string
Amplifier Status Commands
The commands listed in Table 2–3 are used to identify, configure, and test the
AM 5030 amplifier.
Table 2–3: Amplifier Status Commands
2–18
Command Name
Description
ID?
Returns instrument ID including firmware version numbers
INIT
Initializes AM 5030 to factory default settings
SERIAL?
Returns AM 5030 serial number
TEST
Performs AM 5030 self test
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Functional Command Groups
Probe Status Commands
The commands listed in Table 2–4 are used to adjust and provide information
about the probe currently in use.
Table 2–4: Probe Status Commands
Command Name
Description
PROBEOPen?
Returns the state of the probe open indicator
PROBETRim
Sets probe gain adjustment factor
PROBETYpe?
Returns model of current probe being used
NOTE. The PROBETYpe? query returns PROBETYPE A6302 for both A6302 and
A6312 current probes.
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2–19
Functional Command Groups
2–20
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Commands
This section supports the GPIB commands with command definitions, syntax,
return messages, and examples.
ALLEve? (Query Only)
Returns a comma-delimited list of up to 41 pending event codes. If no event is
pending, it returns the code for “no events to report.”
Syntax
Returns
ALLEve? only produces meaningful results when RQS is off. When RQS is on,
ALLEve? operates the same as EVent?, except that the returned header is
ALLEVE instead of EVENT.
Examples
ALLE?
might return 266, indicating that the degauss/autobalance routine has failed
because the AM 5030 OUTPUT is not terminated into 50 .
AMPS
Sets or queries the resolution of the AM 5030.
Syntax
Arguments
Examples
<Number> is in amperes per division, and should represent a valid setting for the
probe being used. Numbers will be rounded to the nearest setting in a 1–2–5
sequence.
AMPS 0.005
sets the resolution of the AM 5030 to 5 mA/division.
AMPS?
might return AMPS 5E–3, indicating that the AM 5030 resolution of the
AM 5030 is 5 mA/division.
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2–21
Commands
BWLIMit
Sets or queries the 20 MHz bandwidth limit switch.
Syntax
Arguments
Examples
ON turns bandwidth limiting on; OFF turns bandwidth limiting off.
BWLIM ON
turns on bandwidth limiting.
BWLIM?
might return BWLIMIT OFF, indicating that bandwidth limiting is off.
COUpling
Sets or queries the input coupling of the AM 5030.
Syntax
Arguments
Examples
AC sets the input to AC coupling. DC sets the input to DC coupling. REF sets
the input to ground reference.
COU DC
sets the AM 5030 input to DC coupling.
COU?
might return COUPLING REF, indicating that the AM 5030 input is set to
ground reference.
2–22
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Commands
DCLEVel
Sets the DC offset level of the AM 5030. This is the current level that will be
displayed at the oscilloscope ground reference level. This programming
command is the most accurate means to set the DC offset level; the front panel
OUTPUT DC LEVEL control is less precise.
Syntax
Arguments
Examples
<Number> specifies the offset in amperes. The value may range ±10 times the
sensitivity (AMPS) setting. For example, if the current AMPS setting is 1 A/div,
the valid range of the DCLEVel is from –10 A to 10 A.
DCLEV 0.1
sets the DC offset level to 0.1 A.
DCLEV?
might return 1, indicating that the DC offset level is currently 1 A.
DEGAuss (No Query Form)
Initializes the probe degauss/autobalance sequence.
Syntax
Arguments
If the argument is omitted or is zero, the command operates like the front panel
PROBE DEGAUSS AUTOBALANCE button; it recalibrates gain only if a
significant temperature change has occurred since the last calibration.
An argument of 1 forces a gain calibration, even if it would normally be
bypassed because of insufficient temperature change since the last calibration.
An argument of 2 performs a gain calibration only, without balancing the Hall
device. This is used when adjusting the A6302 and A6302XL current probe DC
offset adjustment. See page 6–4.
Examples
DEGA
operates just like pressing the PROBE DEGAUSS AUTOBALANCE button.
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2–23
Commands
ERRor? (Query Only)
Returns the error or event code for the most recent event reported by serial poll,
or for the highest priority condition pending.
ERRor? and EVent? function identically.
Syntax
Returns
Examples
The most recent error/event code.
ERR?
might return 266 as the most recent error code.
EVent? (Query Only)
Returns the error or event code for the most recent event reported by serial poll,
or for the highest priority condition pending.
EVent? and ERRor? function identically.
Syntax
Returns
Examples
The most recent error/event code.
EV?
might return 266 as the most recent error code.
EXit
Causes the AM 5030 to exit a test mode or recover from an error condition.
Syntax
2–24
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Commands
FPLock
Enables and disables the front panel buttons. When locked, the AM 5030 front
panel buttons and knob are completely inoperative.
Syntax
Arguments
Examples
ON turns on the front panel lock, which disables buttons and knob. OFF restores
operation of the buttons and knob.
FPL OFF
restores the operation of the front panel buttons and knob.
FPL?
might return ON, indicating that the front panel buttons and knob are inoperative
because they are locked.
HELp? (Query Only)
Returns a list of commands that are recognized by the AM 5030.
Syntax
Returns
Will always return the string HELP ALLEVE, AMPS, BWLIMIT, COUPLING,
DCLEVEL, DEGAUSS, ERROR, EVENT, EXIT, FPLOCK, HELP, ID, INIT,
OVERLOAD, PATH, PROBEOPEN, PROBETRIM, PROBETYPE, RQS,
SERIAL, SET, TEST, UNITS
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2–25
Commands
ID? (Query Only)
Returns the AM 5030 identification, including the name, Codes & Formats
version, main board firmware version, and GPIB board firmware version.
Syntax
Returns
Examples
The instrument identification string.
ID?
may return the string ID TEK/AM 5030, V81.1, MAIN/1.0, GPIB/1.0.
INIT (No Query Form)
Initializes the AM 5030 to factory default settings.
H
COUPLING is set to GROUND
H
Amps/division is set to minimum for attached probe
H
BW LIMIT is set to OFF.
H
DC LEVEL is set to 0 (zero)
H
The degauss lamp will flash (if probe is connected) indicating that a probe
degauss is required
PROBETRim settings are not changed.
Syntax
OVerload? (Query Only)
Returns the status of the overload indicator (the front panel OVERLOAD light).
Syntax
Returns
Examples
2–26
OV?
might return OVERLOAD ON, indicating an overload condition has occurred.
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Commands
PATH
Controls whether queries return the command header (the command name) along
with the returned data. With PATH off, BWLIMIT? might return ON. With
PATH on, the same query would return BWLIMIT ON.
The PATH command does not affect the data returned from SET?, which will
always return command headers. This is because the reply to SET? must always
be able to be sent as a command string to the AM 5030.
Syntax
Arguments
Examples
ON turns header return on. OFF prevents the inclusion of command name
headers in query return strings other than SET?.
PATH OFF
eliminates headers (command names) from query return strings.
PATH?
might return OFF to indicate that headers are removed from query return strings,
or PATH ON to indicate that headers are included in query return strings.
PROBEOPen? (Query Only)
Returns the status of the probe open indicator (the front panel PROBE OPEN
light).
Syntax
Returns
Examples
PROBEOP?
might return PROBEOPEN ON, indicating that the probe is not locked shut.
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2–27
Commands
PROBETRim
Lets you specify a multiplicative gain factor (trim adjustment) for probe
compensation. There is a trim adjustment value for each type of probe (for
example, A6302/A6312, A6302XL, A6303, A6303XL, or A6304XL). This
command will set or query only the trim adjustment for the type of current probe
currently connected to the AM 5030. If no probe is connected, executing this
command or query will cause error 264, “No probe connected.”
Probe trim is used to perform an optional fine-tune calibration of the A6303
Current Probe
NOTE. The AM 5030 amplifier retains only one trim adjustment value for each
probe type. Before using another probe of the same type, you must specify a new
gain factor. The AM 5030 amplifier regards the A6302 and A6312 as the same
probe type.
Syntax
Arguments
Examples
<number> is a multiplicative gain factor, in the range 0.750 to 1.250 in
increments of 0.001. The probe input will be multiplied by this gain factor.
PROBETR 1
sets the trim adjustment to unity for the type of probe currently connected to the
AM 5030.
PROBETR?
might return PROBETRIM 1.1, indicating that the probe trim adjustment is
currently set to 1.1 for probes of the type of probe currently connected to the
AM 5030.
2–28
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Commands
PROBETYpe? (Query Only)
Returns the type (model) of current probe connected to the AM 5030 INPUT
connector. The return string NOPROBE indicates that no current probe is
connected.
Syntax
PROBETYpe?
Returns
PROBETYPE
PROBETYPE
PROBETYPE
PROBETYPE
PROBETYPE
PROBETYPE
Examples
A6302
A6303
A6302XL
A6303XL
A6304XL
NOPROBE
PROBETY?
might return PROBETYPE A6303, indicating that a A6303 Current Probe is
attached to the INPUT connector of the AM 5030.
NOTE. The PROBETY? query returns PROBETYPE A6302 for both A6302 and
A6312 current probes.
RQS
Enables or disables SRQs (System Requests). When disabled, the AM 5030 does
not act on error conditions other than to log them, and does not signal that it is
ready to transmit data to the controller.
Syntax
Arguments
Examples
RQS ON
RQS OFF
RQS?
ON enables SRQ events. Off disables SRQ events.
RQS ON
enables SRQ events.
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2–29
Commands
SERIAL? (Query Only)
Returns the serial number of the AM 5030.
Syntax
Returns
Examples
The instrument serial number as an ASCII string. The serial number is an eight
digit string, always starting with a space (ASCII 32) character.
SERIAL?
might return SERIAL B018607.
SET? (Query Only)
Returns a string containing all the individual programming commands required
to return the AM 5030 to its present state. This string can be saved and sent at
some future time when you want to return the AM 5030 to all the present
settings.
Because this string is intended to be sent back to the AM 5030, the return string
contains command headers (names) regardless of the setting of the PATH
command.
Syntax
Returns
Examples
2–30
! " " " ! " " ! " SET?
might return AMPS 1.0; BWLIMIT OFF; COUPLING DC; DCLEVEL 0.5;
FPLOCK OFF; PATH ON; PROBETRIM 1.000; RQS ON;.
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Commands
TEST (No Query Form)
Instructs the AM 5030 to perform a self-test operation and return the error code
of the first error that occurs. If no error occurs, TEST will return 0.
Syntax
Returns
Examples
TEST
might return TEST 0, indicating that the self-test completed successfully with no
errors.
TEST
might return TEST 357; low battery.
UNIts? (Query Only)
Returns the output units of the AM 5030. Normally, these will be amperes
whenever a current probe is connected to the AM 5030 OUTPUT. Whenever a
voltage adapter or loop-through adapter is connected (both are calibration
fixtures), the units will be volts.
Syntax
Returns
Examples
UNI?
might return A, indicating that a current probe is connected to the AM 5030
OUTPUT connector, and the output units are amperes.
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2–31
Commands
2–32
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Error Messages & Codes
NOTE. This material applies primarily to the AM 5030 Programmable Amplifier.
Event Codes displayed on the front panel apply also to the AM 503B.
These are the event codes (also known as error codes) that the AM 5030 can
generate, along with their meaning. Some of these codes may also appear on the
front panel in the CURRENT/DIVISION readout.
Table 2–5: AM 5030 Event Codes
Error Number
Displayed on
Front Panel
0
No
Null event. Reported when RQS is ON and EVent?, ERRor?, or ALLEve? is attempted prior to
reading the serial poll status byte.
101
No
Invalid GPIB command.
154
No
Invalid number in GPIB command.
155
No
Invalid quoted string. String may be more than 128 characters, be terminated with EOI (or LF if
terminator is set to EOI and LF), or contain an ASCII NUL (0).
156
No
Invalid GPIB command.
157
No
Syntax error.
160
No
Expression too complex.
203
No
I/O buffers full, so output buffer was dumped. This may happen if you send a sequence of
queries without talk-addressing the AM 5030.
250–251
No
Invalid GPIB command.
252
No
AMPS argument out of range. Command not executed.
253
No
DCLEVel argument out of range. Command not executed.
254–256
No
Invalid GPIB command.
257
No
PROBETRim argument out of range. Command not executed.
258–260
No
Invalid GPIB command.
261
No
DEGAuss argument out of range. Command not executed.
262
No
Invalid GPIB command.
263
Yes
Probe opened during degauss/autobalance.
264
No
No probe attached to INPUT connector. This can also occur if a current probe is defective.
265
No
Probe open when degauss/autobalance initiated.
266
Yes
The Amplifier OUTPUT was not terminated into 50 . It can also be caused by faulty hardware.
267
Yes
Internal buffer overflow.
268
No
Invalid GPIB command.
Description of Error
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2–33
Error Messages & Codes
Table 2–5: AM 5030 Event Codes (Cont.)
Error Number
Displayed on
Front Panel
Description of Error
350
Yes
Amplifier needs repair. Cannot EXit from this error.
351–354
Yes
Amplifier needs repair.
355
Yes
NVRAM failure, Amplifier reset to factory default. Will occur first power up after new firmware
has been installed.
356
Yes
Amplifier needs repair.
357
Yes
Internal battery is weak and needs replacement.
(displayed as L0)
358
Yes
An error occurred while the AM 5030 was restoring previously-saved settings.
359
Yes
Probe needs repair; AM 5030 cannot recognize the probe type.
360–362
Yes
Amplifier needs repair.
363–364
Yes
Amplifier or probe needs repair.
400
No
AM 5030 function normal, no events to report.
401
No
Power on has occurred.
450
No
Degauss/autobalance complete.
550–594
Yes
Error occurred during internal automatic adjustment. Repeated errors in the range 550–594
indicate the Amplifier needs repair. 580 and 581 indicate that the Amplifier was unable to
complete a probe offset adjustment. See the DC Offset Adjustment procedure for the particular
probe you are using.
650
No
Timer indicates too long since last degauss; probe should be degaussed. PROBE DEGAUSS
AUTOBALANCE light will blink until probe degaussed.
651
No
Probe overload occurred; probe should be degaussed. PROBE DEGAUSS AUTOBALANCE
light will blink until probe degaussed.
652–653
No
The automatic Hall-device biasing circuit is at the end of its compensation range; probe should
be degaussed. PROBE DEGAUSS AUTOBALANCE light will blink until probe degaussed.
2–34
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Reference
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Reference Notes
These notes are provided to help you realize the full potential of the AM 503B
and AM 5030 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 fail calibration.
If the impedance of your circuit is higher than that shown in Table 3–1, the
degauss procedure will succeed because the Amplifier will be able to saturate the
probe core. While degauss occurs, the probe will induce a voltage in the
unpowered circuit. This also appears in Table 3–1. 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
A6312
10 m
40 mV at 200 Hz
A6302
10 m
40 mV at 200 Hz
A6303
5 m
30 mV at 200 Hz
A6302XL
10 m
40 mV at 200 Hz
A6303XL
5 m
30 mV at 200 Hz
A6304XL
1 m
15 mV at 100 Hz
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3–1
Reference Notes
Bandwidth Limiting
You can reduce the apparent noise on a current waveform by pressing the 20MHz
BW LIMIT button on the AM 503B and AM 5030. You can also use the
bandwidth limiting of your oscilloscope.
WARNING. Do not exceed the specified bandwidth limits of your current probe.
Measuring frequencies in excess of the specified limit can cause the probe to
overheat severely, resulting in personal injury or damage to the equipment. Refer
to the probe Instructions for frequency derating.
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 amplifier.
1. Orient the two conductors under test so that the polarities oppose each other.
Clamp the current probe around the two conductors as shown in Figure 3–1.
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.
Conductor #2
Conductor #1
Current
Current
Current Probe
Figure 3–1: Measuring Differential Current and Nulls
3–2
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Reference Notes
AC and DC Coupling
You can couple the signal input to the AM 503B and AM 5030 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. Figure 3–2(a) shows a low-frequency square wave using
AC coupling. The signal exhibits low-frequency rolloff. By changing the
Amplifier coupling to DC, the pulse is displayed as truly square, as shown in
Figure 3–2(b).
(a) AC-Coupled Signal
(b) DC-Coupled Signal
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. Press the COUPLING button on the Amplifier repeatedly until the AC light
goes on.
2. Adjust the CURRENT/DIVISION controls on the Amplifier so that the
signal shows maximum detail without going off the oscilloscope screen.
3. Press the COUPLING button of the Amplifier repeatedly until the DC light
goes on. Center the DC component on the zero-current line by adjusting the
OUTPUT DC LEVEL control of the Amplifier. The signal trace on the
oscilloscope will move up and down as the control is adjusted.
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.
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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. Specifications in the
probe Instructions lists the maximum current ratings of compatible probes.
H
Maximum Continuous Current refers to the maximum current that can be
continuously measured at DC or at a specified AC frequency. The maximum
continuous current value is derated with frequency; as the frequency
increases, the maximum continuous current rating decreases.
H
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.
H
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 (see Figure 3–3a). 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 A6312 Current Probe has a maximum Ampere-second product
of 100 Ams. If a pulse measured with an A6312 has a peak current of 40 A, the
maximum allowable pulse width would be 100 Ams divided by 40 A, or 2.5 ms.
3–4
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Reference Notes
Imax
Maximum
Pulsed
Current
Do Not Exceed
p
Pulse Width
at 50%
50%
Pulse Width
at 50%
50%
Imax
Maximum
Continuous
Current
c
0A
(a) Maximum Allowable Pulse Width
(b) Maximum Allowable Pulse Amplitude
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 (see Figure 3–3b). Divide the Ampere-second (or Amperemicrosecond) 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 A6312 Current Probe has a maximum Ampere-second product
of 100 Ams. If a pulse measured with an A6312 probe has a width of 3 ms, the
maximum allowable peak current would be 100 Ams divided by 3 ms, or 33.3 A.
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 equipment damage, do not exceed the
specified electrical limits of the AM 503B and AM 5030 or any applicable
accessories. When using multiple conductors, do not exceed current limits on
either conductor.
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3–5
Reference Notes
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.
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 Figure 3–4(a). 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 Figure 3–4(b). 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 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.
Current
Current
Current
Current
Conductor
Under Test
Conductor
Under Test
Bucking Current
Supplied by
Second Conductor
Extra Turns Added
to Increase
Bucking Current
Current Probe
Current Probe
(a) Adding a Second Conductor
(b) Adding Multiple Turns
Figure 3–4: Increasing the DC Measurement Range
3–6
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Reference Notes
Extending AC Range
You can extend the AC amplitude limit of the AM 503B and AM 5030 by using
the Tektronix CT-4 High-Current Transformer. The CT-4, designed for use with
the A6312, A6302, or A6302XL 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 A6312, A6302, or
A6302XL, 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 in Figure 3–5. The signal is multiplied by the number of turns around the probe.
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.
Conductor
Under Test
Extra Turns for
Increased Sensitivity
Current Probe
Figure 3–5: Increasing Probe Sensitivity
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3–7
Reference Notes
3–8
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Application Notes
This section describes some of the typical measurement applications of the
AM 503B and AM 5030 Current Probe Amplifiers:
H
Automobile Charging Systems
H
Inductance Measurements
H
Continuity Test of Multiple-Conductor Cable
H
Measuring Inductor Turns Count
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 diagram in Figure 3–6 shows the equipment setup. Refer to Table 3–2 for
the test equipment setup. An A6303 Current Probe was used for this high-current, low-voltage application. The A6303 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
AM 503B and AM 5030
COUPLING
DC
OUTPUT DC LEVEL
0V
(oscilloscope ground reference
line)
CURRENT/DIVISION
10 A
20MHz BW LIMIT
off
Coupling
DC
Volts/Division
10 mV
Zero-Current Reference
Center graticule line
Time Base
200 ms/division
Oscilloscope
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3–9
Application Notes
A6303
Battery
Alternator
To
Ground
To Ground
To Current Probe Amplifier
Figure 3–6: Setup for Measuring Charging Current
The waveform in Figure 3–7(a) shows the three-phase ripple frequency. 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, as shown in Figure 3–7(b).
40A
0A
(a) Normal Waveform
(b) Waveform with One Bad Phase
Figure 3–7: Charge Current Waveforms
3–10
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Application Notes
Inductance Measurements
You can use the AM 503B and AM 5030 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
Figure 3–8 shows a measurement setup using a constant-voltage pulse generator
of extremely low output impedance. 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, shown in
Figure 3–9, and is mathematically expressed by the following formula:
L + *di E
dt
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.
Current
Flow (i)
Pulse
Generator
Inductor
Current
Probe
Figure 3–8: 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.
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3–11
Application Notes
Current
Flow (i)
di
Time (t)
dt
Figure 3–9: 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. Figure 3–10 shows the setup
diagram, which is similar to the previous example. The current ramp represented
in Figure 3–11 shows how the values for the inductance formula are obtained.
Use this formula to calculate the inductance based on the current measurement:
L+t R
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.
3–12
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Application Notes
Resistance L
Current
Flow (i)
Pulse
Generator
Inductance
Current
Probe
Figure 3–10: Measuring Inductance with a High-Impedance Source
Current
Flow (i)
100%
63.2%
36.8%
0
t
t
Time (t)
Figure 3–11: High-Impedance Source Current Ramp
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3–13
Application Notes
Continuity Test of Multiple-Conductor Cable
Single conductors in a multiconductor cable can be tested with the AM 503B and
AM 5030. 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.
Measuring Inductor Turns Count
To obtain an approximate turns count of an inductor, connect the inductor to a
current limited source, as shown in Figure 3–12. 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 3–13). 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:
N2 + N1
Im
I1
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.
Measure Input Current Here
Current Flow (i)
Coil
Clamp probe
around coil to
measure
current from
coil turns
Figure 3–12: Measuring the Number of Turns in a Coil
3–14
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Application Notes
A6303 Current Probe
Current Flow
in Coil #1
Input Current
Current Flow
in Coil #2
Figure 3–13: Turns Measurement Using Reference Coil
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3–15
Application Notes
3–16
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Error Codes
During normal operation, the CURRENT/DIVISION readout of the AM 503B
and AM 5030 displays the scale factor or other setting such as the GPIB address.
If an instrument failure occurs, the display will flash an error code number.
Error Code 266
The Amplifier displays error code 266 when the Amplifier output is not properly
terminated into a 50 load. Make sure your Amplifier OUTPUT is connected to
an oscilloscope input using a 50 BNC cable, and that the oscilloscope input is
set to 50 impedance. See Figure 1–1 on page 1–2 for proper cabling.
If your oscilloscope does not have 50 impedance settings for inputs, you can
place a 50 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.
Error Code LO
When the internal backup battery becomes weak, the CURRENT/DIV display
will momentarily flash the characters LO when the instrument is turned on. For
battery replacement instructions, refer to Battery Replacement on page 7–10.
NOTE. If a battery low condition occurs, calibration values in NVRAM may be
lost, which can cause the the AM 503B and AM 5030 to fail to meet specifications.
Other Error Codes
If an error code other than 266 or LO appears, consult Table 3–3 for an explanation of the error. If the error is a hardware failure, turn the instrument off and
then on again. If the error condition persists, have the instrument serviced by a
qualified service person.
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3–17
Error Codes
Table 3–3: AM 503B and AM 5030 Front-Panel Error Codes
Error Number
Description of Error
263
Probe opened during degauss/autobalance.
266
The Amplifier OUTPUT was not terminated into 50 . It can also be caused by faulty hardware.
267
Internal buffer overflow.
350–354
Amplifier needs repair.
355
NVRAM failure, Amplifier reset to factory default. Will occur first power up after new firmware has been installed.
356
Amplifier needs repair.
357 or LO
Internal battery is weak and needs replacement.
358
An error occurred while the Amplifier was restoring previously saved settings.
359
Probe needs repair; the Amplifier cannot recognize the probe type. Try removing and reconnecting the current
probe, and make sure it is locked.
360–362
Amplifier needs repair.
363–364
Amplifier or probe needs repair.
550–594
750–768
Error occurred during internal automatic adjustment. Repeated errors in the range 550–594 indicate the Amplifier
needs repair. 580 and 581 indicate that the Amplifier was unable to complete a probe offset adjustment. See the
DC Offset Adjustment procedure for the particular probe you are using.
3–18
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Troubleshooting
Table 3–4 lists possible problems that you may encounter when measuring
current with the AM 503B and AM 5030. Use this as a quick troubleshooting
reference.
Table 3–4: Troubleshooting
Problem
Remedy
Amplifier will not power up, though the TM
Series Power Module does power up.
Move the Amplifier to another slot in the TM Series Power Module.
Front panel displays error code 266.
The Amplifier is not terminated into 50 . Set oscilloscope input impedance to 50 ,
and input coupling to DC. (If the oscilloscope input impedance is fixed at 1 M,
attach a 50 termination (see replaceable parts list) at the oscilloscope input. Do not
attach the termination at the Amplifier output.)
Front panel displays error code 357 or LO.
Battery is weak. Battery replacement should be performed by a qualified service
person.
Front panel displays an error code.
Note the error code and turn the instrument off.
(Power transistors in that position of the TM Series Power Module may be defective.
This may be the case even if other TM 500 or TM 5000 instruments work in that
position; not all instruments use the power module power transistors.)
Review installation and operating information in this manual.
Power up the instrument. If the error condition persists, refer the instrument to
qualified service personnel for repair.
Cannot make a current measurement.
Current Probe is not locked.
Current Probe is improperly connected to the Amplifier input connector.
Coupling is set to REF position. Change to AC or DC.
Cannot degauss the probe.
Current Probe is not locked.
Current Probe is improperly connected to the Amplifier input connector.
Stray DC component in measurement.
Degauss the probe using the PROBE DEGAUSS AUTOBALANCE button. (The
Current Probe has been overloaded, bumped, or exposed to magnetic field.)
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3–19
Troubleshooting
Table 3–4: Troubleshooting (Cont.)
Problem
Remedy
Measurements are inaccurate.
Degauss the probe.
The Amplifier output is not terminated into 50 load. Set the input impedance of
oscilloscope to 50 or connect a 50 feedthrough termination at the oscilloscope
input. Do not attach the termination at the Amplifier output.
Set the vertical amplifier of the oscilloscope to 10 mV/div.
Adjust the oscilloscope ground reference.
Adjust the Amplifier OUTPUT DC LEVEL control to the zero-current reference.
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.
Measurements roll off at high
frequencies.
The Amplifier or oscilloscope bandwidth limit is turned on. Verify that bandwidth limit
switches of both the Amplifier and the oscilloscope are set to the full 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.
Current Probe is improperly connected to the Amplifier input.
Amplifier output is not terminated into 50 load. Set input impedance of oscilloscope
to 50 or connect a 50 feed-through termination at the oscilloscope input, not at
the Amplifier output.
Measurement aberrations exceed the specified
limit.
The Amplifier output is not terminated into 50 load. Set the input impedance of
oscilloscope to 50 or connect a 50 feedthrough termination (see the replaceable
parts list) at the oscilloscope input. Do not attach the termination to Amplifier output.
The measurement exceeds the maximum continuous current or Ampere-second
product ratings of the Current Probe. (For more information, see Current Limits on
page 3–4.) If possible, upgrade to a probe with a higher current rating or use a CT-4
transformer.
Measurements exhibit excessive delay or
slowed pulse response.
The Amplifier output is not terminated into 50 load. Set the input impedance of
oscilloscope to 50 or connect a 50 feedthrough termination (see the replaceable
parts list) at the oscilloscope input. Do not attach the termination to Amplifier output.
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.
Bandwidth limit is turned on. Verify that bandwidth limit switches of both the Amplifier
and the oscilloscope are set to the full bandwidth position.
3–20
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Specifications
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Specifications
For additional probe specifications, refer to the probe’s Instructions.
These specifications are valid only under the following conditions:
H
The probe and amplifier have been calibrated at an ambient temperature of
23_±5_ C.
H
The probe and amplifier are operating in an environment whose limits are
described in Table 4–4 (the operating temperature limits are 0_ C to +50_ C,
unless otherwise stated).
H
The probe and amplifier have had a warm-up period of at least 20 minutes.
H
The probe degauss/autobalance routine has been performed after the
20-minute warm-up period, and thereafter whenever the PROBE
DEGAUSS/AUTOBALANCE light blinks.
H
The Amplifier output is properly terminated into 50 .
Specifications are separated into two categories: warranted specifications and
nominal or typical characteristics.
Because of a change in the probe input connector, the performance specifications
are guaranteed only for probes having the following serial numbers:
A6312 . . . . . .
A6302 . . . . . .
A6303 . . . . . .
A6302XL . . .
A6303XL . . .
A6304XL . . .
All
B050000 and above
B022000 and above
All
All
All
Probes with earlier serial numbers can be updated; contact your nearest Tektronix
Service Center.
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4–1
Specifications
Warranted Specifications
Warranted specifications, Table 4–1, are guaranteed performance specifications
unless specifically designated as typical or nominal.
Table 4–1: Warranted AM 503B and AM 5030 Specifications
Installed Probe
P
Parameter
A6312
Bandwidth
A6303
A6302XL
A6303XL
A6304XL
DC to 100 MHz, DC to 50 MHz,
–3 dB
–3 dB
DC to 15 MHz,
–3 dB
DC to 17 MHz,
–3 dB
DC to 10 MHz,
–3 dB
DC to 2 MHz,
–3 dB
Rise Time, 10% to 90%
v3.5 ns
v7 ns
v23 ns
v20 ns
v35 ns
v175 ns
DC Gain Accuracy
≤3%1
≤3%1
≤3%
≤3%1
≤3%
≤3%
1
A6302
The DC gain accuracy is correctable to < 0.2% when using the probe trim procedure described on page 2–10.
Nominal and Typical Characteristics
Nominal and typical characteristics, Tables 4–2 and 4–3, are not guaranteed.
They are provided to characterize the configuration, performance, or operation of
typical probe/amplifier combinations.
Table 4–2: Nominal and Typical AM 503B and AM 5030 Characteristics
Installed Probe
P
Parameter
A6312
A6302
A6303
A6302XL
A6303XL
A6304XL
Current/Division Ranges,
nominal, Oscilloscope at
10 mV/div
1 mA/div to
5 A/div,
1–2–5
sequence
1 mA/div to
5 A/div,
1–2–5
sequence
5 mA/div to
50 A/div,
1–2–5
sequence
1 mA/div to
5 A/div,
1–2–5
sequence
5 mA/div to
50 A/div,
1–2–5
sequence
500 mA/div to
200 A/div,
1–2–5
sequence
Input Coupling, nominal
AC, DC, and
REF
AC, DC, and
REF
AC, DC, and
REF
AC, DC, and
REF
AC, DC, and
REF
AC, DC, and
REF
AC Coupling LowFrequency Bandwidth,
typical
<7 Hz, –3 dB
<7 Hz, –3 dB
<7 Hz, –3 dB
<7 Hz, –3 dB
<7 Hz, –3 dB
<7 Hz, –3 dB
Output DC Level Adjustment Range, typical
±10 divisions
±10 divisions
±10 divisions
±10 divisions
±10 divisions
±10 divisions
Output Dynamic Range,
typical (Including Output
DC Level Setting)
±10 divisions,
±100 mV
±10 divisions,
±100 mV
±10 divisions,
±100 mV
±10 divisions,
±100 mV
±10 divisions,
±100 mV
±10 divisions,
±100 mV
Displayed Noise, typical
<250 mARMS
Limit measurement bandwidth
to 100 MHz.
<250 mARMS
Limit measurement bandwidth
to 100 MHz.
<2.5 mARMS
Limit measurement bandwidth
to 100 MHz.
<250 mARMS
Limit measurement bandwidth
to 100 MHz.
<2.5 ARMS
Limit measurement bandwidth
to 100 MHz.
<0.25 ARMS
Limit measurement bandwidth
to 20 MHz.
4–2
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Specifications
Table 4–2: Nominal and Typical AM 503B and AM 5030 Characteristics (Cont.)
Installed Probe
Parameter
A6312
A6302
A6303
A6302XL
A6303XL
A6304XL
Bandwidth Limit, –3 dB,
typical
20 MHz
±4 MHz
20 MHz
±4 MHz
12 MHz
±3 MHz
14 MHz
±2 MHz
9 MHz
±2 MHz
2 MHz
±10 kHz
Signal Delay, typical,
with provided 50 cable
approximately
30 ns
approximately
30 ns
approximately
55 ns
approximately
60 ns
approximately
105 ns
approximately
105 ns
Table 4–3: AM 503B and AM 5030 Mechanical Characteristics
Parameter, nominal
Characteristic
Length
298 mm (11.7 in)
Height
127 mm (5.0 in)
Width
67 mm (2.63 in)
Weight
2 kg (4.4 lb)
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4–3
Specifications
Environmental Characteristics
The environmental characteristics in Table 4–4 are warranted performance
specifications. Unlike the warranted characteristics in Table 4–1, the environmental characteristics are type tested; therefore there are no performance
verification procedures provided to test these characteristics.
Table 4–4: AM 503B and AM 5030 Environmental Characteristics
Parameter
Characteristic
Ambient Temperature
Operating
0_ C to +50_ C
Nonoperating
–55_ C to +75_ C
Humidity
Operating
50_ C, to 95% R.H.
Nonoperating
60_ C, to 95% R.H.
Altitude
Operating
4,570 m (15,000 ft) maximum
Nonoperating
15,200 m (50,000 ft) maximum
Random Vibration
4–4
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
Shock
30 g, 11 ms duration, half-sine pulses
Bench Handling
30 g, 11 ms duration, half-sine pulses
Topple Test
30 g, 11 ms duration, half-sine pulses
Transit Test, Packaged Product
38.1 cm (15 in) free-fall drop height,
91 kg (200 lb) compressive load,
32 mm (0.125 in) displacement,
30 minute vibration test,
1.33 gRMS, 1 hour each axis random vibration test
Electro-Magnetic Compliance
Meets FCC Part 15, Subpart B, Class A
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Warning
The following servicing instructions are for use only by qualified personnel. To
avoid personal injury, do not perform any servicing other than that contained in
the operating instructions unless you are qualified to do so. Refer to General
Safety Summary and Service Safety Summary prior to performing any service.
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Performance Verification
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Performance Verification Setup
The Performance Verification tests allow you to demonstrate that the Current
Probe Amplifier/Current Probe meet their specified levels of performance. Since
the AM 503B and AM 5030 cannot operate without a current probe, different
procedures are provided so that you can use the one that matches your current
probe.
Tolerances that are specified in these procedures apply to the Amplifier and
current probe and do not include test equipment error.
The recommended calibration interval is one year.
Test Procedure Conditions
These procedures are valid only under the following conditions:
H
The system has been calibrated at an ambient temperature of 23_±5_ C.
H
The system is operating in an environment whose limits are described in
Table 4–4 on page 4–4.
H
The system, including probe, has had a warm-up period of at least
20 minutes.
H
The probe degauss/autobalance routine has been performed after the
20-minute warm-up period.
Equipment Preparation
Before performing the verification tests, install all plug-in units into the power
module and turn the power on. Turn any remaining equipment on and allow the
entire system, including the attached probe, to warm up for a minimum of 20
minutes.
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5–1
Performance Verification Setup for Current Probes
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 off.
The Amplifier front panel will display an error code 266 during the degauss/
autobalance routine if the Amplifier is not properly terminated into 50 . Verify
that the oscilloscope input is 50 and set to DC coupling. Use a 50 feedthrough termination, attached at the oscilloscope input, if necessary.
Warranted Specifications
The warranted specifications for the performance verification procedures are
listed in Table 4–1 on page 4–2.
5–2
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Performance Verification with an A6312
The test procedures in this section verify proper performance of the AM 503B
and AM 5030 Amplifiers with an A6312 current probe. Tolerances that are
specified in these procedures apply to the Amplifier and current probe and do not
include test equipment error.
No probe or Amplifier adjustments are required during these test procedures.
Should any test fail, refer to the troubleshooting section for troubleshooting
recommendations.
Read page 5–1 before starting these procedures. Also, read each procedure
through completely before starting to ensure proper completion.
Required Test Equipment
To perform the acceptance tests in this section, you will need the test equipment
listed in Table 5–1. 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.
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5–3
Performance Verification with an A6312
Table 5–1: Required Test Equipment
5–4
Qty
Item
Description
Recommended
Equipment
1
Oscilloscope
500 MHz bandwidth
TDS 520B
1
Current Probe
Amplifier
1
Leveled Sine Wave
Generator
3 MHz to 100 MHz
Wavetek 9100 with
Option 250 or SG 503
equivalent
1
Calibration Generator
1 MHz square wave, rise time <1 ns,
1 Vp-p into 50 W
Wavetek 9100 with
Option 250 or
PG 506A equivalent
1
Digital Multimeter
0.25% 31/2 digit resolution
DM2510/G or
Fluke 850x/884x
1
Current Source
0.3% accuracy, 0 to ±2 A
Fluke 5700A or
Wavetek 9100 with
Option 250
1
Calibration Fixture
50 W, BNC Connector
015-0601-50
1
Current Loop
20 turns 27 AWG coated wire
Refer to page 5–21
1
Termination
50 W, ±0.1%, 0.5 W
011-0129-00
1
BNC Cable
50 W, 1.05 m (42 in) long
012-0057-01
1
BNC to Dual
Banana Adapter
AM503B or AM5030
103-0090-00
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Performance Verification with an A6312
Bandwidth
This procedure tests the bandwidth of the A6312 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. Refer to Figure 5–1
when making equipment connections.
Test Oscilloscope
Leveled
Sine Wave
Generator
Amplifier in TM
Series Power
Module
Current Probe
Output
50 oscilloscope input (or add 50 termination here if oscilloscope has
only high-impedance input).
Calibration
Fixture
Figure 5–1: Bandwidth Test Setup for A6312
Equipment Connections
1. Using a 50 W BNC cable, connect the Amplifier OUTPUT to a 50 W
oscilloscope input. If the input impedance of your oscilloscope is 1 MW,
connect a 50 W feedthrough termination at the oscilloscope input. Do not
connect the termination at the Amplifier output.
2. Connect the current probe to the Amplifier INPUT.
3. Connect the current loop calibration fixture to the output of the leveled sine
wave generator.
Equipment Settings
Make or verify the equipment settings in Table 5–2.
Table 5–2: Equipment Settings for Bandwidth
Oscilloscope
Vertical input impedance
Vertical gain
Time base
Record length
Coupling
Offset
50 10 mV/division
200 ns/division
500
DC
0 V (mid-scale)
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5–5
Performance Verification with an A6312
Table 5–2: Equipment Settings for Bandwidth (Cont.)
Oscilloscope
Trigger type
Trigger mode
Trigger position
Acquisition mode
Number of waveforms to average
Measurement type
Edge
Auto
50%
Average
8
Peak-to-Peak
Leveled Sine Wave Generator
Frequency
Amplitude
3 MHz
3 Vp-p
AM 503B and AM 5030
Coupling
BW Limit
Current/division
Procedure
DC
Off (full bandwidth)
10 mA/division
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 calibration fixture.
4. Adjust the signal generator output so that the Amplifier output is approximately 60 mVp-p, or six graticule divisions on the oscilloscope.
5. Using the peak-peak measurement capability of the oscilloscope, measure
and record the peak-peak reading as M1 .
6. Set the oscilloscope time base to 5 ns/division. Increase the signal generator
frequency to the warranted bandwidth. Refer to Table 4–1 on page 4–2.
7. Using the peak-peak measurement capability of the oscilloscope, measure
and record the peak-peak reading as M2 .
8. 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:
ǒMM Ǔ u 0.707
2
1
5–6
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Performance Verification with an A6312
NOTE. The impedance of the calibration fixture used in this test changes between
3 MHz and 100 MHz. Typically the impedance changes from 50 at 3 MHz to
59 at 100 MHz. Thus you can substitute the following equation to make this
test more accurate:
(1.18)
ǒMM Ǔ u 0.707
2
1
Rise Time
This procedure measures the rise time of the A6312. In this test you directly
measure the rise time of a step input. Refer to Figure 5–2 when making
equipment connections.
Test Oscilloscope
Amplifier in TM
Series Power
Module
Calibration
Generator
Current Probe
Fast Rise
Output
50 Input
Calibration
Fixture
Figure 5–2: Rise Time Test Setup for A6312
Equipment Connections
1. Using a 50 BNC cable, connect the Amplifier OUTPUT to a 50 oscilloscope input. If the input impedance of your oscilloscope is 1 M,
connect a 50 feedthrough termination at the oscilloscope input. Do not
connect the termination at the Amplifier output.
2. Connect the current probe to the Amplifier INPUT.
3. Connect the current loop calibration fixture to the calibration generator 50 fast rise output.
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5–7
Performance Verification with an A6312
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 in Table 5–3:
Table 5–3: Equipment Settings for Rise Time
Oscilloscope
Vertical input impedance
Vertical gain
Time base
Record length
Coupling
Offset
Trigger type
Trigger mode
Trigger position
Acquisition mode
Number of waveforms to average
Measurement type
50 W
10 mV/division
2 ns/division
500
DC
0 V (mid-scale)
Edge
Auto
50%
Average
32
Rise Time
Calibration Generator
Period
Output
Amplitude
1 ms
Fast rise
Maximum
AM 503B and AM 5030
Coupling
BW Limit
Current/division
Procedure
DC
Off (full bandwidth)
5 mA/division
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 calibration fixture. Verify that the
arrow-shaped indicator on the probe points away from the pulse source.
4. Using the measurement capability of the oscilloscope, measure the rise time
of the displayed pulse from 10% to 90% amplitude.
5–8
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Performance Verification with an A6312
5. Calculate the rise time of the probe (tr probe) using the formula below:
t r probe +
Ǹ
t r measured
2
* t r system 2
The measured rise time (tr measured) is the value calculated in step 4.
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.)
6. Verify that the probe rise time is less than the warranted specification. Refer
to Table 4–1 on page 4–2.
DC Gain Accuracy
This procedure tests the DC gain accuracy of the A6312 Current Probes. In this
test you compare the voltage output of the Amplifier to a reference input.
Current Loop for DC Gain
Accuracy Check
You will need to construct a simple current loop in order to complete the DC
gain accuracy tests.
WARNING. Magnetic fields are produced that may cause a malfunction in heart
pacemakers, or damage to sensitive equipment.
Construct the loop using a cylindrical form approximately 3 inches in diameter,
wind exactly 20 turns of #27 coated wire.
NOTE. Ensure that the current loop has exactly 20 turns. A significant error will
result for each turn variance from 20 turns.
Equipment Connections
1. Using a BNC cable, connect the Amplifier OUTPUT to the 50 feedthrough termination. Attach the termination to a BNC-to-dual banana
adapter. Taking care to observe and maintain polarity, insert the dual banana
adapter into the digital multimeter DC voltage input.
2. Connect the current loop to the current source as shown in Figure 5–3.
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5–9
Performance Verification with an A6312
Amplifier in TM
Series Power
Module
Current
Source
DMM
Output
+
–
+ –
20 Turns
BNC to Dual
Banana Adapter
50 Termination
Probe
50 Coaxial
Cable
Current Flow
Figure 5–3: DC Gain Accuracy Test Setup for A6312
Equipment Settings
Make or verify the equipment settings in Table 5–4:
Table 5–4: Equipment Settings for DC Gain Accuracy
Digital Multimeter
Measurement Type
Range
DC volts
Autoranging
Current Source
Output
Off
AM 503B and AM 5030
Coupling
BW Limit
Current/division
Probe Trim
Procedure
DC
On (20 MHz)
1 mA/division
000
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 20 turn current loop, as shown in Figure
5–6 on page 5–22. Verify that the arrow-shaped indicator on the probe points
away from the current source.
5–10
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Performance Verification with an A6312
4. For each of the Amplifier current/division settings in Table 5–5, perform the
following steps:
a. Set the Amplifier to the desired current/division setting from Table 5–5.
b. Set the current source to the correct positive test current using Table 5–5.
c. Turn on the current source.
d. Record the exact measurement of the digital multimeter as M1 . (You can
copy Table 5–6 on page 5–13 to record the results of your measurements.)
e. Set the current source for the correct negative test current using
Table 5–5.
Table 5–5: DC Gain Accuracy Test for A6312
Turns of Current
Loop Passing
Through Probe
AM 503B and
AM 5030
Current/Division
Current Source
Output
Test Current
It
20
1 mA
±250 mA
10 mA
20
2 mA
±500 mA
20 mA
20
5 mA
±1.25 mA
50 mA
20
10 mA
±2.5 mA
100 mA
20
20 mA
±5 mA
200 mA
20
50 mA
±12.5 mA
500 mA
20
100 mA
±25 mA
1A
20
200 mA
±50 mA
2A
20
500 mA
±125 mA
5A
20
1A
±250 mA
10 A
20
2A
±500 mA
20 A
20
5A
±1 A
40 A
f.
Record the digital multimeter reading as M2 .
g. Calculate the measured current (Im ) using the following formula:
Im +
M1 – M2
0.01
(currentńdivision)
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5–11
Performance Verification with an A6312
For example, you might have obtained values of 50 mV for M1 and
48 mV for M2 . If you are using an Amplifier setting of 10 mA/division,
you can compute Im as:
Im +
(50.0x10 –3) – (–48x10 –3)
0.01
(10x10 –3) + 98 mA
h. Verify that the measured current (Im ) is within ±3% of the test current (It )
by computing %Error as follows:
%Error +
Im * It
It
100
For example, using a test current It of 100 mA and a measured current Im
of 98 mA, the %Error would be:
%Error +
5–12
98 – 100
100
100 + –2%
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Performance Verification with an A6312
Table 5–6: DC Gain Accuracy Test Worksheet for A6312
Turns of Current
Loop Passing
Through Probe
AM 503B and
AM 5030
Current/Division
Current Source
Output
Test Current
It
20
1 mA
±250 mA
10 mA
20
2 mA
±500 mA
20 mA
20
5 mA
±1.25 mA
50 mA
20
10 mA
±2.5 mA
100 mA
20
20 mA
±5 mA
200 mA
20
50 mA
±12.5 mA
500 mA
20
100 mA
±25 mA
1A
20
200 mA
±50 mA
2A
20
500 mA
±125 mA
5A
20
1A
±250 mA
10 A
20
2A
±500 mA
20 A
20
5A
±1 A
40 A
Note A
Note B
Im +
M1 – M2
0.01
%Error +
M1
M2
Im
(Note A)
%Error
(Note B)
(currentńdivision)
Im * It
It
100
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5–13
Performance Verification with an A6312
5–14
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Performance Verification with an A6302 or A6302XL
The test procedures in this section verify proper performance of the AM 503B
and AM 5030 Amplifiers with an A6302 or A6302XL current probe. Tolerances
that are specified in these procedures apply to the Amplifier and current probe
and do not include test equipment error.
No probe or Amplifier adjustments are required during these test procedures.
Should any test fail, refer to the troubleshooting section for troubleshooting
recommendations.
Read page 5–1 before starting these procedures. Also, read each procedure
through completely before starting to ensure proper completion.
Required Test Equipment
To perform the acceptance tests in this section, you will need the test equipment
listed in Table 5–7. 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.
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5–15
Performance Verification with an A6302 or A6302XL
Table 5–7: Required Test Equipment
5–16
Qty
Item
Description
Recommended
Equipment
1
Oscilloscope
350 MHz bandwidth
TDS 520B
1
Current Probe
Amplifier
1
Leveled Sine Wave
Generator
3 MHz to 50 MHz
Wavetek 9100 with
Option 250 or SG 503
equivalent
1
Calibration Generator
1 MHz square wave, rise time <1 ns,
1 Vp-p into 50 W
Wavetek 9100 with
Option 250 or
PG 506A equivalent
1
Digital Multimeter
0.25% 31/2 digit resolution
DM2510/G or
Fluke 850x/884x
1
Current Source
0.3% accuracy, 0 to ±2 A
Fluke 5700A or
Wavetek 9100 with
Option 250
1
Calibration Fixture
50 W, BNC Connector
015-0601-50
1
Current Loop
20 turns 27 AWG coated wire
Refer to page 5–21
1
Termination
50 W, ±0.1%, 0.5 W
011-0129-00
1
BNC Cable
50 W, 1.05 m (42 in) long
012-0057-01
1
BNC to Dual
Banana Adapter
AM503B or AM5030
103-0090-00
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Performance Verification with an A6302 or A6302XL
Bandwidth
This procedure tests the bandwidth of the A6302 and A6302XL 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. Refer to
Figure 5–4 when making equipment connections.
Test Oscilloscope
Leveled
Sine Wave
Generator
Amplifier in TM
Series Power
Module
Current Probe
Output
50 oscilloscope input (or add 50 termination here if oscilloscope has
only high-impedance input).
Calibration
Fixture
Figure 5–4: Bandwidth Test Setup for A6302/A6302XL
Equipment Connections
1. Using a 50 W BNC cable, connect the Amplifier OUTPUT to a 50 W
oscilloscope input. If the input impedance of your oscilloscope is 1 MW,
connect a 50 W feedthrough termination at the oscilloscope input. Do not
connect the termination at the Amplifier output.
2. Connect the current probe to the Amplifier INPUT.
3. Connect the current loop calibration fixture to the output of the leveled sine
wave generator.
Equipment Settings
Make or verify the equipment settings in Table 5–8.
Table 5–8: Equipment Settings for Bandwidth
Oscilloscope
Vertical input impedance
Vertical gain
Time base
Record length
Coupling
Offset
50 10 mV/division
200 ns/division
500
DC
0 V (mid-scale)
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5–17
Performance Verification with an A6302 or A6302XL
Table 5–8: Equipment Settings for Bandwidth (Cont.)
Oscilloscope
Trigger type
Trigger mode
Trigger position
Acquisition mode
Number of waveforms to average
Measurement type
Edge
Auto
50%
Average
8
Peak-to-Peak
Leveled Sine Wave Generator
Frequency
Amplitude
3 MHz
3 Vp-p
AM 503B and AM 5030
Coupling
BW Limit
Current/division
Procedure
DC
Off (full bandwidth)
10 mA/division
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 calibration fixture.
4. Adjust the signal generator output so that the Amplifier output is approximately 60 mVp-p, or six graticule divisions on the oscilloscope.
5. Using the peak-peak measurement capability of the oscilloscope, measure
and record the peak-peak reading as M1 .
6. Set the oscilloscope time base to 10 ns/division. Increase the signal generator
frequency to the warranted bandwidth. Refer to Table 4–1 on page 4–2.
7. Using the peak-peak measurement capability of the oscilloscope, measure
and record the peak-peak reading as M2 .
8. 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:
ǒMM Ǔ u 0.707
2
1
5–18
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Performance Verification with an A6302 or A6302XL
NOTE. The impedance of the calibration fixture used in this test changes slightly
between 3 MHz and 50 MHz. Typically the impedance changes from 50 at
3 MHz to 53 at 50 MHz. Thus you can substitute the following equation to
make this test more accurate:
(1.06)
ǒMM Ǔ u 0.707
2
1
Rise Time
This procedure measures the rise time of the A6302 and A6302XL. In this test
you directly measure the rise time of a step input. Refer to Figure 5–5 when
making equipment connections.
Test Oscilloscope
Amplifier in TM
Series Power
Module
Calibration
Generator
Current Probe
Fast Rise
Output
50 Input
Calibration
Fixture
Figure 5–5: Rise Time Test Setup for A6302/A6302XL
Equipment Connections
1. Using a 50 BNC cable, connect the Amplifier OUTPUT to a 50 oscilloscope input. If the input impedance of your oscilloscope is 1 M,
connect a 50 feedthrough termination at the oscilloscope input. Do not
connect the termination at the Amplifier output.
2. Connect the current probe to the Amplifier INPUT.
3. Connect the current loop calibration fixture to the calibration generator 50 fast rise output.
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5–19
Performance Verification with an A6302 or A6302XL
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 in Table 5–9:
Table 5–9: Equipment Settings for Rise Time
Oscilloscope
Vertical input impedance
Vertical gain
Time base
Record length
Coupling
Offset
Trigger type
Trigger mode
Trigger position
Acquisition mode
Number of waveforms to average
Measurement type
50 W
10 mV/division
2 ns/division
500
DC
0 V (mid-scale)
Edge
Auto
50%
Average
8
Rise Time
Calibration Generator
Period
Output
Amplitude
1 ms
Fast rise
Maximum
AM 503B and AM 5030
Coupling
BW Limit
Current/division
Procedure
DC
Off (full bandwidth)
5 mA/division
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 calibration fixture. Verify that the
arrow-shaped indicator on the probe points away from the pulse source.
4. Using the measurement capability of the oscilloscope, measure the rise time
of the displayed pulse from 10% to 90% amplitude.
5–20
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Performance Verification with an A6302 or A6302XL
5. Verify that the rise time is less than the warranted specification. Refer to
Table 4–1 on page 4–2.
DC Gain Accuracy
This procedure tests the DC gain accuracy of the A6302 and A6302XL Current
Probes. In this test you compare the voltage output of the Amplifier to a
reference input.
Current Loop for DC Gain
Accuracy Check
You will need to construct a simple current loop in order to complete the DC
gain accuracy tests.
WARNING. Magnetic fields are produced that may cause a malfunction in heart
pacemakers, or damage to sensitive equipment.
Construct the loop using a cylindrical form approximately 3 inches in diameter,
wind exactly 20 turns of #27 coated wire.
NOTE. Ensure that the current loop has exactly 20 turns. A significant error will
result for each turn variance from 20 turns.
Equipment Connections
1. Using a BNC cable, connect the Amplifier OUTPUT to the 50 feedthrough termination. Attach the termination to a BNC-to-dual banana
adapter. Taking care to observe and maintain polarity, insert the dual banana
adapter into the digital multimeter DC voltage input.
2. Connect the current loop to the current source as shown in Figure 5–6.
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5–21
Performance Verification with an A6302 or A6302XL
Amplifier in TM
Series Power
Module
Current
Source
DMM
Output
+
–
+ –
20 Turns
BNC to Dual
Banana Adapter
50 Termination
Probe
50 Coaxial
Cable
Current Flow
Figure 5–6: DC Gain Accuracy Test Setup for A6302/A6302XL
Equipment Settings
Make or verify the equipment settings in Table 5–10:
Table 5–10: Equipment Settings for DC Gain Accuracy
Digital Multimeter
Measurement Type
Range
DC volts
Autoranging
Current Source
Output
Off
AM 503B and AM 5030
Coupling
BW Limit
Current/division
Probe Trim
Procedure
DC
On (20 MHz)
1 mA/division
000
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 20 turn current loop, as shown in Figure
5–6 on page 5–22. Verify that the arrow-shaped indicator on the probe points
away from the current source.
5–22
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Performance Verification with an A6302 or A6302XL
4. For each of the Amplifier current/division settings in Table 5–11 on
page 5–23, perform the following steps:
a. Set the Amplifier to the desired current/division setting from Table 5–11.
b. Set the current source to the correct positive test current using Table
5–11.
c. Turn on the current source.
d. Record the exact measurement of the digital multimeter as M1 . (You can
copy Table 5–12 on page 5–25 to record the results of your measurements.)
e. Set the current source for the correct negative test current using
Table 5–11.
Table 5–11: DC Gain Accuracy Test for A6302/A6302XL
Turns of Current
Loop Passing
Through Probe
AM 503B and
AM 5030
Current/Division
Current Source
Output
Test Current
It
20
1 mA
±250 mA
10 mA
20
2 mA
±500 mA
20 mA
20
5 mA
±1.25 mA
50 mA
20
10 mA
±2.5 mA
100 mA
20
20 mA
±5 mA
200 mA
20
50 mA
±12.5 mA
500 mA
20
100 mA
±25 mA
1A
20
200 mA
±50 mA
2A
20
500 mA
±125 mA
5A
20
1A
±250 mA
10 A
20
2A
±500 mA
20 A
20
5A
±1 A
40 A
f.
Record the digital multimeter reading as M2 .
g. Calculate the measured current (Im ) using the following formula:
Im +
M1 – M2
0.01
(currentńdivision)
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5–23
Performance Verification with an A6302 or A6302XL
For example, you might have obtained values of 50 mV for M1 and
48 mV for M2 . If you are using an Amplifier setting of 10 mA/division,
you can compute Im as:
Im +
(50.0x10 –3) – (–48x10 –3)
0.01
(10x10 –3) + 98 mA
h. Verify that the measured current (Im ) is within ±3% of the test current (It )
by computing %Error as follows:
%Error +
Im * It
It
100
For example, using a test current It of 100 mA and a measured current Im
of 98 mA, the %Error would be:
%Error +
5–24
98 – 100
100
100 + –2%
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Performance Verification with an A6302 or A6302XL
Table 5–12: DC Gain Accuracy Test Worksheet for A6302/A6302XL
Turns of Current
Loop Passing
Through Probe
AM 503B and
AM 5030
Current/Division
Current Source
Output
Test Current
It
20
1 mA
±250 mA
10 mA
20
2 mA
±500 mA
20 mA
20
5 mA
±1.25 mA
50 mA
20
10 mA
±2.5 mA
100 mA
20
20 mA
±5 mA
200 mA
20
50 mA
±12.5 mA
500 mA
20
100 mA
±25 mA
1A
20
200 mA
±50 mA
2A
20
500 mA
±125 mA
5A
20
1A
±250 mA
10 A
20
2A
±500 mA
20 A
20
5A
±1 A
40 A
Note A
Note B
Im +
M1 – M2
0.01
%Error +
M1
M2
Im
(Note A)
%Error
(Note B)
(currentńdivision)
Im * It
It
100
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5–25
Performance Verification with an A6302 or A6302XL
5–26
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Performance Verification with an A6303 or A6303XL
The test procedures in this section check for proper performance of the AM 503B
and AM 5030 with an A6303 or A6303XL current probe. Tolerances that are
specified in these procedures apply to the Amplifier and current probe and do not
include test equipment error.
No probe or Amplifier adjustments are required during these test procedures.
Should any tests fail, refer to the troubleshooting section for troubleshooting
recommendations.
Read page 5–1 before starting these procedures. Also, read each procedure
through completely before starting to ensure proper completion.
Required Test Equipment
To perform the acceptance tests in this section, you will need the test equipment
listed in Table 5–13. 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 5–13: Required Test Equipment
Qty
Item
Description
Recommended
Equipment
1
Oscilloscope
350 MHz bandwidth
TDS 520B
1
Current Probe
Amplifier
1
Leveled Sine Wave
Generator
3 MHz to 15 MHz
Wavetek 9100 with
Option 250 or SG 503
equivalent
1
Calibration Generator
1 MHz square wave, rise time <1 ns,
1 Vp-p into 50 W
Wavetek 9100 with
Option 250 or
PG 506A equivalent
1
Digital Multimeter
0.25% 31/2 digit resolution
DM2510/G
1
Current Source
0.3% accuracy, 0 to ±2 A
Fluke 5700A or
Wavetek 9100
1
Calibration Fixture
50 W, BNC Connector
015-0601-50
1
Current Loop
50 turns 21 AWG coated wire
Refer to page 5–32
1
Termination
50 W, ±0.1%, 0.5 W
011-0129-00
AM503B or AM5030
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5–27
Performance Verification with an A6303 or A6303XL
Table 5–13: Required Test Equipment (Cont.)
Qty
Item
Description
Recommended
Equipment
1
BNC Cable
50 , 1.05 m (42 in) long
012-0057-01
1
BNC to Dual
Banana Adapter
103-0090-00
Bandwidth
This procedure tests the bandwidth of the A6303 and A6303XL 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 check that
the signal amplitude does not fall below –3 dB at the probe bandwidth. Refer to
Figure 5–7 when making equipment connections.
Test Oscilloscope
Leveled
Sine Wave
Generator
Amplifier in TM
Series Power
Module
Current
Probe
50 oscilloscope input (or
add 50 termination here
if oscilloscope has only
high-impedance input).
Fast Rise
Output
Calibration
Fixture
Figure 5–7: Bandwidth Test Setup for an A6303/A6303XL
Equipment Connections
1. Using a 50 W BNC cable, connect the Amplifier OUTPUT to a 50 W
oscilloscope input. If the input impedance of your oscilloscope is 1 MW,
connect a 50 W feedthrough termination at the oscilloscope input. Do not
connect the termination at the Amplifier output.
2. Connect the current probe to the Amplifier INPUT.
3. Connect the current loop calibration fixture to the output of the leveled sine
wave generator.
Equipment Settings
5–28
Make or check the equipment settings in Table 5–14:
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Performance Verification with an A6303 or A6303XL
Table 5–14: Equipment Settings for Bandwidth
Oscilloscope
Vertical input impedance
Vertical gain
Time base
Record length
Coupling
Offset
Trigger type
Trigger mode
Trigger position
Acquisition mode
Number of waveforms to average
Measurement type
50 10 mV/division
200 ns/division
500
DC
0 V (mid-scale)
Edge
Auto
50%
Average
8
Peak-to-Peak
Leveled Sine Wave Generator
Frequency
Amplitude
3 MHz
3 Vp-p
AM 503B and AM 5030
Coupling
BW Limit
Current/division
Procedure
DC
Off
10 mA/division
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 current loop calibration fixture.
4. Adjust the signal generator output so that the Amplifier output is
≈Ă60 mVp-p, or six graticule divisions on the oscilloscope.
5. Using the peak-peak measurement capability of the oscilloscope, measure
and record the peak-peak reading as M1 .
6. Set the oscilloscope time base to 50 ns/division. Increase the signal generator
frequency to the warranted bandwidth. Refer to Table 4–1 on page 4–2.
7. Using the peak-peak measurement capability of the oscilloscope, measure
and record the peak-peak reading as M2 .
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5–29
Performance Verification with an A6303 or A6303XL
8. The probe meets the bandwidth specification if the ratio of the signal
amplitude at the warranted bandwidth is at least 0.707 of the signal
amplitude at 3 MHz. Use the following formula to check probe bandwidth:
ǒMM Ǔ u 0.707
2
1
Rise Time
This procedure measures the rise time of the A6303 and A6303XL. In this test
you directly measure the rise time of a step input. Refer to Figure 5–8 when
making equipment connections.
Test Oscilloscope
Amplifier in TM
Series Power
Module
Calibration
Generator
Current
Probe
Fast Rise
Output
50 Input
Calibration
Fixture
Figure 5–8: Rise Time Test Setup for A6303/A6303XL
Equipment Connections
1. Using a BNC cable, connect the Amplifier OUTPUT to a 50 oscilloscope
input. If the input impedance of your oscilloscope is 1 M, connect a 50 feedthrough termination at the oscilloscope input. Do not connect the
termination at the Amplifier output.
2. Connect the probe to the Amplifier.
3. Connect the current loop calibration fixture to the calibration generator 50 fast rise 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
5–30
Make or check the equipment settings in Table 5–15.
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Performance Verification with an A6303 or A6303XL
Table 5–15: Equipment Settings for Rise Time
Oscilloscope
Vertical input impedance
Vertical gain
Time base
Record length
Coupling
Offset
Trigger type
Trigger mode
Trigger position
Acquisition mode
Number of waveforms to average
Measurement type
50 W
5 mV/division
10 ns/division
500
DC
0 V (mid-scale)
Edge
Auto
50%
Average
8
Rise Time
Calibration Generator
Period
Output
Amplitude
1 ms
Fast Rise
Maximum
AM 503B and AM 5030
Coupling
BW Limit
Current/division
DC
Off
5 mA/division
NOTE. This is the only test where the oscilloscope vertical gain should be set at
other than 10 mV/division. Reset the vertical gain to 10 mV/division when the
rise time check is complete.
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 off.
3. Clamp the current probe around the current loop calibration fixture. Check
that the arrow-shaped indicator on the probe points away from the source.
4. Using the measurement capability of the oscilloscope, measure the rise time
of the displayed pulse from 10% to 90% amplitude.
5. Check that the rise time is less than the warranted specification. Refer to
Table 4–1 on page 4–2.
6. Reset the oscilloscope vertical gain to 10 mV/division.
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5–31
Performance Verification with an A6303 or A6303XL
DC Gain Accuracy
WARNING. This test produces intense magnetic fields that may cause malfunctions in a normally operating heart pacemaker or damage sensitive equipment.
Personnel fitted with pacemakers should not perform this test, and should stay at
least 10 feet from the current loop while the test is being conducted.
This procedure tests the DC gain accuracy of the A6303 and A6303XL. In this
test you compare the voltage output of the Amplifier to a reference input.
Current Loop for DC Gain
Accuracy Check
You will need to construct a simple current loop in order to complete the DC
gain accuracy tests. Construct the loop as follows using a cylindrical form
approximately 3 inches in diameter, wind exactly 50 turns of #21 coated wire.
NOTE. Ensure that the current loop has exactly 50 turns. A significant error will
result for each turn variance from 50 turns.
Equipment Settings
Make or check the equipment settings in Table 5–16.
Table 5–16: Equipment Settings for DC Gain Accuracy
Digital Multimeter
Measurement Type
Range
DC volts
Autoranging
Current Source
Output
Off
AM 503B and AM 5030
Coupling
BW Limit
Current/division
Equipment Connections
DC
On
5 mA/division
1. Using a BNC cable, connect the Amplifier OUTPUT to a 50 feedthrough
termination. Attach the termination to a BNC-to-dual banana adapter. Taking
care to observe the adapter polarity, insert the dual banana adapter into the
digital multimeter DC voltage input.
2. Connect the current loop to the current source as shown in Figure 5–9.
5–32
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Performance Verification with an A6303 or A6303XL
Amplifier in TM
Series Power
Module
Current
Source
DMM
Output
+
–
+ –
50 Turns
BNC to Dual
Banana Adapter
50 Termination
Probe
50 Coaxial
Cable
Current Flow
Figure 5–9: DC Gain Accuracy Test Setup for A6303/A6303XL
WARNING. This test produces intense magnetic fields that may cause malfunctions in a normally operating heart pacemaker or damage sensitive equipment.
Personnel fitted with pacemakers should not perform this test, and should stay at
least 10 feet from the current loop while the test is being conducted.
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 off.
3. Clamp the current probe around the one conductor of the current loop. (See
Figure 5–9 on page 5–33.) Check that the arrow-shaped indicator on the
probe points away from the current source.
4. For each of the Amplifier current/division settings in Table 5–17 on
page 5–34, perform the following steps:
a. Set the Amplifier to the desired current/division setting from Table 5–17.
b. Set the current source to the correct positive test current using Table
5–17.
c. Turn on the current source.
d. Record the exact measurement of the digital multimeter as M1 . (You can
copy Table 5–18 on page 5–36 to record the results of your measurements.)
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5–33
Performance Verification with an A6303 or A6303XL
e. Set the current source for the correct negative test current using
Table 5–17.
Table 5–17: DC Gain Accuracy Test for A6303/A6303XL
Turns of Current
Loop Passing
Through Probe
AM 503B and
AM 5030
Current/Division
Current Source
Output
Test Current
It
50
5 mA
±500 mA
50 mA
50
10 mA
±1 mA
100 mA
50
20 mA
±2 mA
200 mA
50
50 mA
±5 mA
500 mA
50
100 mA
±10 mA
1A
50
200 mA
±20 mA
2A
50
500 mA
±50 mA
5A
50
1A
±100 mA
10 A
50
2A
±200 mA
20 A
50
5A
±500 mA
50 A
50
10 A
±1 A
100 A
50
20 A
±2 A
200 A
50
50 A
±2 A
200 A
f.
Record the digital multimeter reading as M2 .
g. Calculate the measured current (Im ) using the following formula:
Im +
M1 – M2
0.01
(currentńdivision)
For example, you might have obtained values of 50 mV for M1 and
48 mV for M2 . If you are using an Amplifier setting of 10 mA/division,
you can compute Im as:
Im +
5–34
(50.0x10 –3) – (–48x10 –3)
0.01
(10x10 –3) + 98 mA
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Performance Verification with an A6303 or A6303XL
h. Verify that the measured current (Im ) is within ±3% of the test current (It )
by computing %Error as follows:
%Error +
Im * It
It
100
For example, using a test current It of 100 mA and a measured current Im
of 98 mA, the %Error would be:
%Error +
98 – 100
100
100 + –2%
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5–35
Performance Verification with an A6303 or A6303XL
Table 5–18: DC Gain Accuracy Test Work Sheet for A6303/A6303XL
Turns of Current
Loop Passing
Through Probe
AM 503B and
AM 5030
Current/Division
Current Source
Output
Test Current
It
50
5 mA
±500 mA
50 mA
50
10 mA
±1 mA
100 mA
50
20 mA
±2 mA
200 mA
50
50 mA
±5 mA
500 mA
50
100 mA
±10 mA
1A
50
200 mA
±20 mA
2A
50
500 mA
±50 mA
5A
50
1A
±100 mA
10 A
50
2A
±200 mA
20 A
50
5A
±500 mA
50 A
50
10 A
±1 A
100 A
50
20 A
±2 A
200 A
50
50 A
±2 A
200 A
Note A
Note B
5–36
Im +
M1 – M2
0.01
%Error +
M1
M2
Im
(Note A)
%Error
(Note B)
(currentńdivision)
Im * It
It
100
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Performance Verification with an A6304XL
The test procedures in this section check for proper performance of the AM 503B
and AM 5030 with an A6304XL current probe. Tolerances that are specified in
these procedures apply to the Amplifier and current probe and do not include test
equipment error. Table 5–19 is a list of equipment required for these procedures.
No probe or Amplifier adjustments are required during these test procedures.
Should any tests fail, refer to the troubleshooting section for troubleshooting
recommendations.
Read page 5–1 before starting these procedures. Also, read each procedure
through completely before starting to ensure proper completion.
Required Test Equipment
To perform the acceptance tests in this section, you will need the test equipment
listed in Table 5–19. 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 5–19: Required Test Equipment
Qty
Item
Description
Recommended
Equipment
1
Oscilloscope
20 MHz bandwidth
Tektronix TDS 520B
1
Digital Multimeter
0.25%, 31/2 digit resolution
DM2510/G or
Fluke 850x/884x
1
Current Source
0.3% accuracy, 0 to ±2 A
Fluke 5700A or
Wavetek 9100 with
Option 250
1
Calibration Generator
Square wave with a rise time <35 ns,
5 A into 50 W
AVTECH1
AVR-3-PW-C-P-TEK2
1
Current Loop
250 turns
067-0240-00
1
Termination
50 W, ±0.1%, 0.5 W
011-0129-00
2
BNC Cable
50 W, 1.05 m (42 in) long
012-0057-01
3
BNC to Dual
Banana Adapter
1
103-0090-00
AVTECH Electrosystems Ltd.
P.O. Box 265, Ogdensburg NY 13669-0265
(315) 472-5270 or (800) 265-6681
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5–37
Performance Verification an A6304XL
Rise Time
This procedure measures the rise time of the A6304XL. In this test you directly
measure the rise time of a step input. Refer to Figure 5–10 when making
equipment connections.
Test Oscilloscope
Amplifier in TM
Series Power
Module
Calibration
Generator
Current
Probe
50 Input
Output Loop
Figure 5–10: Rise Time Test Setup for the A6304XL
Equipment Connections
1. Using a BNC cable, connect the Amplifier OUTPUT to a 50 oscilloscope
input. If the input impedance of your oscilloscope is 1 M, connect a 50 feedthrough termination at the oscilloscope input. Do not connect the
termination at the Amplifier output.
2. Connect the probe to the Amplifier.
3. Connect the current loop calibration fixture to the calibration generator 50 fast rise 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.
5–38
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Performance Verification an A6304XL
Equipment Settings
Make or check the equipment settings in Table 5–20:
Table 5–20: Equipment Settings for Rise Time
Oscilloscope
Vertical input impedance
Vertical gain
Time base
Record length
Coupling
Offset
Trigger type
Trigger mode
Trigger position
Acquisition mode
Number of waveforms to average
Measurement type
50 W
10 mV/division
50 ns/division
500
DC
0 V (mid-scale)
Edge
Auto
50%
Average
8
Rise Time
Calibration Generator
Pulse width
Pulse repetition frequency
Amplitude
250 ms
25 Hz
5 A peak
AM 503B and AM 5030
Coupling
BW Limit
Current/division
Procedure
DC
Off
1 A/division
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 current loop calibration fixture. Check
that the arrow-shaped indicator on the probe points away from the source.
4. Using the measurement capability of the oscilloscope, measure the rise time
of the displayed pulse from 10% to 90% amplitude.
5. Check that the rise time is less than the warranted specification. Refer to
Table 4–1 on page 4–2.
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5–39
Performance Verification an A6304XL
Bandwidth
The bandwidth of the probe is derived as a function of its rise time. The rise time
(tr ) is measured in nanoseconds between the 10% and 90% points of the leading
edge of the pulse. (Refer to the procedure on page 5–38.) To calculate the probe
bandwidth, use the following formula:
ǒ0.35
Ǔ + Bandwidth
t
r
For example, a rise time of 175 ns would result in the following solution:
ǒ175
Ǔ
0.35
+ 2.0
10 *9 seconds
10 6 Hertz
DC Gain Accuracy
WARNING. This test produces intense magnetic fields that may cause malfunctions in a normally operating heart pacemaker or damage sensitive equipment.
Personnel fitted with pacemakers should not perform this test, and should stay at
least 10 feet from the current loop while the test is being conducted.
This procedure tests the DC gain accuracy of the A6304XL. In this test you
compare the voltage output of the Amplifier to a reference input.
Equipment Connections
1. Using a BNC cable, connect the Amplifier OUTPUT to a 50 feedthrough
termination. Attach the termination to a BNC-to-dual banana adapter. Taking
care to observe the adapter polarity, insert the dual banana adapter into the
digital multimeter DC voltage input.
2. Connect the current loop to the current source as shown in Figure 5–11.
5–40
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Performance Verification an A6304XL
Amplifier in TM
Series Power
Module
Current
Source
DMM
Output
+
–
+ –
250 Turns
Sense
BNC to Dual
Banana Adapter
50 Termination
Probe
50 Coaxial
Cable
Current Flow
Figure 5–11: DC Gain Accuracy Test Setup for the A6304XL
Equipment Settings
Make or check the equipment settings in Table 5–21.
Table 5–21: Equipment Settings for DC Gain Accuracy
Digital Multimeter
Measurement
DC volts
Current Source
Output
Off
AM 503B and AM 5030
Coupling
BW Limit
Current/division
Probe Trim
DC
On
500 mA/division
000
WARNING. This test produces intense magnetic fields that may cause malfunctions in a normally operating heart pacemaker or damage sensitive equipment.
Personnel fitted with pacemakers should not perform this test, and should stay at
least 10 feet from the current loop while the test is being conducted.
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 off.
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5–41
Performance Verification an A6304XL
3. Clamp the current probe around the current loop. Check that the arrowshaped indicator on the probe points away from the current source. (See
Figure 5–11 on page 5–41.)
4. For each of the Amplifier current/division settings in Table 5–22 on page
5–43, perform the following steps:5
a. Set the Amplifier to the desired current/division setting from Table 5–22.
b. Set the current source to the correct positive test current using Table
5–22.
c. Turn on the current source.
d. Record the exact measurement of the digital multimeter as M1 . (You can
copy Table 5–23 on page 5–44 to record the results of your measurements.)
e. Set the current source for the correct negative test current using
Table 5–22.
f.
Record the digital multimeter reading as M2 .
g. Calculate the measured current (Im ) using the following formula:
Im +
M1 – M2
0.01
(currentńdivision)
For example, you might have obtained values of 50 mV for M1 and
48 mV for M2 . If you are using an Amplifier setting of 1 A/division, you
can compute Im as:
Im +
(50.0x10 –3) – (–48x10 –3)
0.01
1 + 9.80 A
h. Verify that the measured current (Im ) is within ±3% of the test current (It )
by computing %Error as follows:
%Error +
Im – It
It
100
For example, using a test current It of 10 A and a measured current Im of
9.80 A, the %Error would be:
%Error +
5–42
9.80 – 10.0
10.0
100 + –2%
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Performance Verification an A6304XL
Table 5–22: DC Gain Accuracy Test for the A6304XL
Turns of Current
Loop Passing
Through Probe
AM 503B and
AM 5030
Current/Division
Current Source
Output
Test Current
It
250
500 mA
±10 mA
5A
250
1A
±20 mA
10 A
250
2A
±40 mA
20 A
250
5A
±100 mA
50 A
250
10 A
±200 mA
100 A
250
20 A
±400 mA
200 A
250
50 A
±1 A
500 A
250
100 A
±2 A
1000 A
250
200 A
±2 A
1000 A
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5–43
Performance Verification an A6304XL
Table 5–23: DC Gain Accuracy Test Work Sheet for the A6304XL
Turns of Current
Loop Passing
Through Probe
AM 503B and
AM 5030
Current/Division
Current Source
Output
Test Current
It
250
500 mA
±10 mA
5A
250
1A
±20 mA
10 A
250
2A
±40 mA
20 A
250
5A
±100 mA
50 A
250
10 A
±200 mA
100 A
250
20 A
±400 mA
200 A
250
50 A
±1 A
500 A
250
100 A
±2 A
1000 A
250
200 A
±2 A
1000 A
Note A
Note B
5–44
Im +
M1 – M2
0.01
%Error +
M1
M2
Im
(Note A)
%Error
(Note B)
(currentńdivision)
Im * It
It
100
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Adjustment Procedures
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Adjustment Procedures for Current Probes
Before performing the adjustment procedures, perform the following steps:
1. Install all plug-in units into the power modules.
2. Attach the current probe to be adjusted.
3. Turn the power on and allow the entire system to warm up for a minimum of
20 minutes. Also warm up any other test equipment used.
The recommended calibration interval is one year.
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6–1
Adjustment Procedures for Current Probes
6–2
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A6312, A6302 and A6302XL Adjustment
The following adjustment procedure describes how to adjust the DC offset of the
A6312, A6302 and A6302XL. 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 in Table 6–1. 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 6–1: Required Test Equipment
Qty
Item
Description
Recommended
Equipment
1
Oscilloscope
150 MHz bandwidth
TDS 520B
1
Termination1
50 W, BNC connector,
feedthrough
011-0129-00
1
1
BNC Cable1
50 W, 1.05 m (42 in) long
012-0057-01
Provided as a standard accessory with the AM 503B and AM 5030.
A6312, A6302 and A6302XL DC Offset Adjustment
Figure 6–1 shows the location of the DC offset adjustment in the lower probe
half.
DC Offset
Figure 6–1: A6312, A6302 and A6302XL DC Offset Adjustment Location
Equipment Connections
1. Connect the Amplifier OUTPUT to a 50 oscilloscope input using a 50 BNC cable. If the input impedance of your oscilloscope is 1 M, connect a
50 feedthrough termination to the oscilloscope input. Do not connect the
termination at the Amplifier output.
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6–3
A6312, A6302 and A6302XL Adjustment
2. Connect the current probe to the Amplifier INPUT connector.
3. Do not clamp the current probe around any conductor, but make sure the
jaws are locked shut.
Equipment Settings
Make or verify the equipment settings in Table 6–2:
Table 6–2: Settings for DC Offset Adjustment
AM 503B and AM 5030
Coupling
BW Limit
Current/division
DC
On (20 MHz bandwidth limit)
10 mA/division
Oscilloscope
Vertical Gain
Time Base
Input Coupling
Procedure
10 mV/division
1 ms/division,
Auto triggered
Ground
1. Move the oscilloscope trace to the center horizontal graticule line using the
vertical position control.
2. Set the oscilloscope input coupling to DC.
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 off.
NOTE. The Amplifier front panel will display error code 266 after the degauss/
autobalance routine completes if the Amplifier is not properly terminated into
50 . Verify that the oscilloscope input is 50 and set to DC coupling. If
necessary, use a 50 termination at the oscilloscope input.
5. If no error codes are displayed after the degauss/autobalance routine
completes, no offset adjustment is necessary. If any of the error codes listed
in Table 6–3 are displayed, continue with the procedure.
6–4
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A6312, A6302 and A6302XL Adjustment
Table 6–3: Error Codes Requiring DC Offset Adjustment
Error Code
Meaning
580
Unable to complete negative offset adjustment
581
Unable to complete positive offset adjustment
6. Press and hold the 20 MHz BW LIMIT button, and while holding it, press the
PROBE DEGAUSS AUTOBALANCE button. This sets the front panel
display to –00 and puts the AM 503B and AM 5030 into an internal test
mode.
7. Press the CURRENT/DIVISION
reads –52.
button until the front panel display
8. Press and release the 20 MHz BW LIMIT button. The Amplifier will
degauss itself; wait until the DEGAUSS light goes out.
9. Adjust the DC Offset control so that the oscilloscope trace is on the center
graticule line (zero offset), ±1 division.
10. Press and release the 20 MHz BW LIMIT button, then press and release the
COUPLING button. This exits the AM 503B and AM 5030 test mode.
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6–5
A6312, A6302 and A6302XL Adjustment
6–6
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A6303 and A6303XL Adjustments
Each of the following adjustment procedures describes how to adjust specific
performance characteristics of the A6303 and the A6303XL. 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 procedures in this section, you will need the test
equipment listed in Table 6–4. The test equipment must meet or exceed the
specifications listed. The test procedures may need to be changed if the
recommended equipment is not used.
Table 6–4: Required Test Equipment
Qty
Item
Description
Recommended
Equipment
1
Oscilloscope
150 MHz bandwidth
TDS 520B
1
Current Probe Amplifier
1
Calibration Generator
1
Current Loop
1
AM 503B or AM 5030
DC or 1 kHz square wave,
5 Vp-p into 50 W,
0.5% vertical accuracy
50 W
Wavetek 9100 with Option
250 or
PG 506A equivalent
015-0601-50
Termination
50 W, BNC connector,
feedthrough
011-0129-00
2
BNC Cables
50 W, 1.05 m (42 in) long
012-0057-01
1
BNC T-adapter
50 W
103-0030-00
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6–7
A6303 and A6303XL Adjustments
A6303 and A6303XL DC Offset Adjustment
This procedure describes how to adjust the DC offset of the A6303 and
A6303XL using the DC Offset adjustment. Refer to Figure 6–2 when performing
this procedure.
HF2
HF3
DC Offset
A6303 or A6303XL
Current Probe
HF1
Figure 6–2: A6303 and A6303XL Adjustment Locations
Equipment Connections
1. Connect the Amplifier OUTPUT to a 50 oscilloscope input using a 50 BNC cable. If the input impedance of your oscilloscope is 1 M, connect a
50 feedthrough termination to the oscilloscope input. Do not connect the
termination at the Amplifier output.
2. Connect the current probe to the Amplifier INPUT connector.
3. Do not clamp the current probe around any conductor, but make sure the
jaws are locked shut.
6–8
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A6303 and A6303XL Adjustments
Equipment Settings
Make or verify the equipment settings in Table 6–5:
Table 6–5: Settings for DC Offset Adjustment
AM 503B and AM 5030
Coupling
BW Limit
Current/division
DC
Off (full bandwidth)
10 mA/division
Oscilloscope
Vertical Gain
Time Base
10 mV/division
1 ms/division,
Auto triggered
Ground
Input Coupling
Procedure
1. Move the oscilloscope trace to the center horizontal graticule line using the
vertical position control.
2. Change the oscilloscope input coupling to DC.
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 off.
NOTE. The Amplifier front panel will display error code 266 after the degauss/
autobalance routine completes if the Amplifier is not properly terminated into
50 . Verify that the oscilloscope input is 50 and set to DC coupling. If
necessary, use a 50 termination at the oscilloscope input.
5. If no error codes are displayed after the degauss/autobalance routine
completes, no offset adjustment is necessary. If any of the error codes listed
in Table 6–6 are displayed, continue with the procedure.
Table 6–6: Error Codes Requiring DC Offset Adjustment
Error Code
Meaning
580
Unable to complete negative offset adjustment
581
Unable to complete positive offset adjustment
6. Remove the probe access plug for the DC Offset adjust (see Figure 6–2).
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6–9
A6303 and A6303XL Adjustments
7. Press and hold the 20 MHz BW LIMIT button, and while holding it, press the
PROBE DEGAUSS AUTOBALANCE button. This sets the front panel
display to –00 and puts the AM 503B and AM 5030 into an internal test
mode.
8. Press the CURRENT/DIVISION
reads –52.
button until the front panel display
9. Press and release the 20 MHz BW LIMIT button. The Amplifier will
degauss itself; wait until the DEGAUSS light goes out.
10. Adjust the DC Offset control so that the oscilloscope trace is on the center
graticule line (zero offset), ±1 division.
11. Press and release the 20MHz BW LIMIT button, then press and release the
COUPLING button. This exits the AM 503B and AM 5030 test mode.
A6303 and A6303XL Transient Response and Gain Adjustment
This procedure describes how to optimize the transient response and gain of the
A6303 and A6303XL using adjustments HF1, HF2, and HF3. Refer to figures
6–2 and 6–3 when performing this procedure.
NOTE. The A6303XL has only a single adjustment located at the HF2 position.
Equipment Connections
1. Connect the calibration generator output to a 50 oscilloscope input using a
50 BNC cable. If the input impedance of your oscilloscope is 1 M,
connect a 50 feedthrough termination to the oscilloscope input. Do not
connect the termination to the calibration generator output.
2. Connect the current probe to the Amplifier INPUT connector.
6–10
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A6303 and A6303XL Adjustments
Test Oscilloscope
Calibration
Generator
Amplifier in TM
Series Power
Module
High
Amplitude
Output
50 W Input
A6303/A6303XL
Probe
Current Loop
Figure 6–3: A6303 and A6303XL Adjustment Setup
Equipment Settings
Make or verify the equipment settings in Table 6–7:
Table 6–7: Settings for Transient Response and Gain Adjustments
AM 503B and AM 5030
Coupling
BW Limit
Current/division
DC
Off (full bandwidth)
20 mA/division
Oscilloscope
Vertical Gain
Time Base
Input Coupling
1 V/division
100 ms/division,
Auto triggered
Ground
Calibration Generator
Period
Function
Procedure
0.1 ms
High amplitude
1. Move the oscilloscope trace up one graticule line from the bottom of the
screen.
2. Change the oscilloscope input coupling to DC.
3. Do not clamp the current probe around any conductor, but make sure the
jaws are locked shut.
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6–11
A6303 and A6303XL Adjustments
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 off.
NOTE. The Amplifier front panel will display error code 266 after the degauss/
autobalance routine completes if the Amplifier is not properly terminated into
50 . Verify that the oscilloscope input is 50 and set to DC coupling. If
necessary, use a 50 termination at the oscilloscope input.
5. Adjust the calibration generator to produce an amplitude of five graticule
divisions (5 volts).
NOTE. Do not adjust the calibration generator amplitude for the remainder of
this procedure.
6. Disconnect the BNC cable from the calibration generator and attach it to the
Amplifier OUTPUT connector (see Figure 6–3 on page 6–11).
7. Attach the current loop to the probe and lock the probe.
8. Connect the current loop to the calibration generator output using another
coaxial cable.
9. Reset the vertical gain of the oscilloscope to 10 mV/division and the time
base to 100 ms/division.
10. Reset the period of the calibration generator to 1 ms.
11. Remove the probe access plugs for HF1, HF2, and HF3. Remove the HF2
plug only for the A6303 (see Figure 6–2 on page 6–8).
12. Adjust the probe for optimum performance:
H
A6303: Adjust HF1, HF2, and HF3 for an oscilloscope display of five
divisions and optimum transient response.
H
A6303XL: Adjust only HF2 for an oscilloscope display of five divisions and
optimum transient response. The A6303XL does not have controls in the
HF1 and HF3 positions.
NOTE. The HF1, HF2, and HF3 adjustments on the A6303 interact. Adjusting
them can be a repetitive process. You may need to balance between transient
response and gain in order to meet both specifications at once.
6–12
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A6304XL Adjustments
Each of the following adjustment procedures describes how to adjust specific
performance characteristics of the A6304XL. 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 in Table 6–8. The test equipment must meet or exceed the
specifications listed. The test procedures may need to be changed if Tektronix
equipment is not used.
Perform the steps on page 6–1 before starting these procedures. Also, read each
procedure through completely before starting to ensure proper completion.
Table 6–8: Required Test Equipment
Qty
Item
Description
Recommended
Example
1
Oscilloscope
20 MHz bandwidth
Tektronix TDS 520B
1
Current Probe
Amplifier
1
Calibration Generator
Square wave with a rise time <35 ns,
5 A into 50 W
AVTECH 1
AVR-3-PW-C-P-TEK2
1
Digital Multimeter
0.25% 31/2 digit resolution
DM2510/G or
Fluke 850x/884x
1
Current Source
0.3% accuracy, 0 to ±2 A
Fluke 5700A or
Wavetek 9100 with
Option 250
1
Current Loop
250 turns
067-0240-00
1
Termination
50 W, ±0.1%, 0.5 W
011-0129-00
3
BNC Cables
50 W, 1.05 m (42 in) long
012-0057-01
1
BNC to Dual
Banana Adapter
1
AM 503B or AM 5030
103-0090-00
AVTECH Electrosystems Ltd.
P.O. Box 265, Ogdensburg NY 13669-0265
(315) 472-5270 or (800) 265-6681
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6–13
A6304XL Adjustments
A6304XL DC Offset Adjustment
This procedure details how to adjust the A6304XL offset.
Equipment Connections
1. Connect the Amplifier OUTPUT to a 50 oscilloscope input using a 50 BNC cable. If the input impedance of your oscilloscope is 1 M, connect a
50 feedthrough termination to the oscilloscope input. Do not connect the
termination at the Amplifier output.
2. Connect the current probe to the Amplifier INPUT connector.
3. Do not clamp the current probe around any conductor, but make sure the
jaws are locked shut.
Equipment Settings
Make or verify the equipment settings in Table 6–9:
Table 6–9: Settings for DC Offset Adjustment
AM 503B and AM 5030
Coupling
BW Limit
Current/division
DC
Off (full bandwidth)
1 A/division
Oscilloscope
Vertical Gain
Time Base
Input Coupling
Procedure
10 mV/division
1 ms/division,
Auto triggered
Ground
1. Move the oscilloscope trace to the center horizontal graticule line using the
vertical position control.
2. Change the oscilloscope input coupling to DC.
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 off.
NOTE. The Amplifier front panel will display error code 266 after the degauss/
autobalance routine completes if the Amplifier is not properly terminated into
50 . Verify that the oscilloscope input is 50 and set to DC coupling. If
necessary, use a 50 termination at the oscilloscope input.
6–14
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A6304XL Adjustments
5. If no error codes are displayed after the degauss/autobalance routine
completes, no offset adjustment is necessary. Go to the DC Gain Adjustment
on page 6–16.
6. If either of the error codes in Table 6–10 are displayed, continue with this
procedure.
Table 6–10: Error Codes Requiring DC Offset Adjustment
Error Code
Meaning
580
Unable to complete negative offset adjustment
581
Unable to complete positive offset adjustment
7. Remove the probe access plug for the DC Offset adjust (see Figure 6–4).
10 ms
DC Offset
DC Gain
A6304XL
Current Probe
1 ms
Figure 6–4: A6304XL Adjustment Locations
8. Press and hold the 20 MHz BW LIMIT button, and while holding it, press the
PROBE DEGAUSS AUTOBALANCE button. This sets the front panel
display to –00 and puts the AM 503B and AM 5030 into an internal test
mode.
9. Press the CURRENT/DIVISION
reads –52.
button until the front panel display
10. Press and release the 20 MHz BW LIMIT button. The Amplifier will
degauss the probe; wait until the DEGAUSS light goes out.
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6–15
A6304XL Adjustments
11. Adjust the DC Offset control so that the oscilloscope trace is on the center
graticule line (zero offset), ±1 division.
12. Press and release the 20MHz BW LIMIT button, then press and release the
COUPLING button. This exits the AM 503B and AM 5030 test mode.
DC Gain Adjustment
This procedure adjusts the DC gain accuracy of the A6304XL probe.
CAUTION. This test produces magnetic fields that may cause a malfunction in
normally operating heart pacemakers or damage sensitive equipment. Personnel
fitted with pacemakers should not perform this test and should stay at least 10
feet from the current loop while the test is being conducted.
Equipment Settings
Make or check the equipment settings in Table 6–11:
Table 6–11: Equipment Settings for DC Gain Accuracy
Digital Multimeter
Measurement Type
DC volts
Current Source
Output
Off
AM 503B and AM 5030
Coupling
BW Limit
Current/division
Probe Trim
Equipment Connections
DC
On
10 A/division
000
1. Using a BNC cable, connect the Amplifier OUTPUT to a 50 feedthrough
termination. Attach the termination to a BNC-to-dual banana adapter. Taking
care to observe the adapter polarity, insert the dual banana adapter into the
digital multimeter DC voltage input.
2. Connect the current loop to the current source as shown in
Figure 6–5.
6–16
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A6304XL Adjustments
Amplifier in TM
Series Power
Module
Current
Source
DMM
Output
+
–
+ –
250 Turns
BNC to Dual
Banana Adapter
50 Termination
Probe
50 Coaxial
Cable
Current Flow
Figure 6–5: DC Gain Accuracy Adjustment Setup
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 off.
3. If necessary, adjust DC LEVEL on the amplifier for a zero reading on the
DMM.
4. Clamp the current probe around the current loop. (See Figure 6–5.) Check
that the arrow-shaped indicator on the probe points away from the current
source.
5. Adjust the current output of the power supply to 200 mA.
6. The DMM reading should be 50 mV. If you could not set your current source
to exactly 200 mA, use the formula below:
DMM voltage reading +
current source reading 250 turns
10 Amps/division
10 mV/division
7. If the reading is not correct, adjust DC GAIN on the A6304XL for a correct
reading on the DMM. See Figure 6–4 on page 6–15.
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6–17
A6304XL Adjustments
A6304XL Transient Response Adjustment
This procedure describes how to optimize the transient response of the A6304XL
using the 10 ms and 1 ms adjustments. Refer to figures 6–4 and 6–6 when
performing this procedure.
Equipment Connections
1. Connect the Amplifier output to a 50 W oscilloscope input using a 50 W
BNC cable. If the input impedance of your oscilloscope is 1 MW, connect a
50 W feedthrough termination to the oscilloscope input.
2. Connect the current probe to the Amplifier INPUT connector.
Amplifier in TM
Series Power
Module
Test Oscilloscope
Calibration
Generator
Current
Probe
50 W Input
Output Loop
Figure 6–6: A6304XL Adjustment Setup
Equipment Settings
Make or verify the equipment settings in Table 6–12:
Table 6–12: Equipment Settings for Transient Response
Oscilloscope
Vertical input impedance
Vertical gain
Time base
Record length
Coupling
Offset
Trigger type
Trigger mode
Trigger position
Acquisition mode
Number of waveforms to average
Measurement type
6–18
50 W
10 mV/division
100 ms/division
500
DC
0 V (mid-scale)
Edge
Normal
50%
Average
8
Rise Time
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A6304XL Adjustments
Table 6–12: Equipment Settings for Transient Response (Cont.)
Calibration Generator
Pulse Width
Pulse Repetition Frequency
Pulse Amplitude
250 ms
20 Hz
5 A peak
AM 503B and AM 5030
Coupling
BW Limit
Current/division
Procedure
DC
Off
1 A/division
1. Move the oscilloscope trace to one graticule line from the bottom of the
screen.
2. Set the oscilloscope input coupling to DC.
3. Do not clamp the current probe around any conductor, but make sure the
jaws are locked shut.
4. Remove the probe access plugs for 1 ms, 10 ms, and DC Gain.
5. 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.
NOTE. The Amplifier front panel will display error code 266 after the degauss/
autobalance routine completes if the Amplifier is not properly terminated into
50 . Verify that the oscilloscope input is 50 and set to DC coupling. If
necessary, use a 50 termination at the oscilloscope input.
6. Lock the jaws of the probe around the calibrator current loop.
7. Adjust the oscilloscope to view the 100 ms portion of the pulse.
8. Adjust the calibration generator to produce an amplitude of five graticule
divisions (5 amps) at the 100 ms portion of the pulse.
NOTE. Do not adjust the calibration generator amplitude for the remainder of
this procedure.
9. Adjust the 10 s control for a flat waveform to match the level at the 100 ms
point.
10. Adjust the oscilloscope sweep to 1 ms/div.
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6–19
A6304XL Adjustments
11. Adjust the 1 s control to flatten the front end of the pulse.
NOTE. The 10 ms and 1 ms adjustments on the A6304XL interact. Adjusting them
can be a repetitive process. You may need to balance between short and long
term response in order to meet both specifications at once.
12. Disconnect the probe from the calibration generator current loop.
13. Verify the DC Gain Accuracy using the procedure on page 6–16.
6–20
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Maintenance
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Customer Maintenance
This manual supports maintenance of the AM 503B and AM 5030 only. For
detailed information on servicing the current probes, refer to the Instructions
provided with the probe.
Service Strategy
The AM 503B and AM 5030 have few customer-serviceable parts and should be
returned to a Tektronix Service Center in the event of failure. Some mechanical
and electrical parts may be replaced by the customer. This section describes the
preventive maintenance and repair procedures.
Preventive Maintenance
The AM 503B and AM 5030 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.
To clean the probe body, use a soft cloth dampened in a solution of mild
detergent and water.
To clean the core, open the jaw and clean the exposed core surfaces with a cloth.
CAUTION. Avoid using chemical cleaning agents that damage plastic. For
example, avoid using chemicals that contain benzene, toluene, xylene, acetone,
or similar solvents. Recommended cleaning agents are isopropyl alcohol
(Isopropanol) or ethyl alcohol (Fotocol or Ethanol).
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7–1
Customer Maintenance
7–2
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Disassembly
Use these procedures when repairing or replacing defective components. For
disassembly instructions pertaining to the TM Series Power Module, refer to that
Instruction Manual.
Static Device Precautions
CAUTION. Static discharge can damage semiconductors in the AM 503B and
AM 5030. Observe the following precautions:
H
Minimize handling of static-sensitive devices.
H
Transport and store static-sensitive components or assemblies in their
original containers, either on a metal surface or conductive foam. Label any
package that contains static-sensitive assemblies or components.
H
Wear a wrist strap while handling these components to discharge the static
voltage from your body. Servicing static-sensitive assemblies or components
should be performed only at a static-free work station. The use of a static
control mat is recommended.
H
Clear anything from the work station surface that is capable of generating or
holding static charge.
H
Keep component leads shorted together whenever possible.
H
Pick up components by the body, never by the leads.
H
Do not slide components over any surface.
H
Avoid handling components in areas that have a floor or a work surface that
is capable of generating static charge.
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7–3
Disassembly
Front Panel Knobs
To remove the front panel knob simply pull the knob off. The shaft will come off
with the knob.
To reinstall the knob, align the slotted end of the shaft with the rib inside the
knob. Push the knob onto the shaft.
Side Covers
To remove the side covers, turn the securing screw 90_ counterclockwise and
pull the cover off, as shown in Figure 7–1. To reassemble, reverse the procedure.
Amplifier
Securing Screw
Figure 7–1: Removing the AM 503B and AM 5030 Side Covers
Front Panel and Release Lever Assembly
CAUTION. The AM 503B and AM 5030 contain devices that are susceptible to
damage from static discharge. To prevent damage to static-sensitive devices,
observe the precautions listed at the beginning of this section whenever the
covers are off the instrument or you handle component assemblies.
In order to remove the front panel assembly, the release lever must be removed.
Perform steps 1 through 4 to remove the front panel assembly. If you want to
repair the release lever assembly, complete all the steps.
The release lever assembly consists of the release lever, latch bar, and retaining
latch. These procedures describe how to remove and replace each item.
1. Remove the left side cover (when facing the front of the Amplifier).
7–4
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Disassembly
2. Push the latch bar forward as shown in Figure 7–2. Pry the back end of the
release lever up and pull the release lever through the front panel.
Retaining
Spring
Latch Bar
Release Lever
Figure 7–2: Removing the Amplifier Release Lever
3. Unplug the input, output, and front panel interface cables from the main
circuit board. Figure 7–3 shows the location of these cables.
Front Panel Interface Cable
Input Cable
(Flex Connector)
Output Cable
Figure 7–3: Location of Amplifier Interface Cables
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7–5
Disassembly
4. Using a Pozidriv #1 screwdriver, remove the two top screws and the two
bottom screws that hold on the front panel and remove the front panel.
Figure 7–4 shows the screw locations.
Screws (Pozidriv #1)
Screws (Pozidriv #1)
Figure 7–4: Location of Front Panel Screws
5. Using a spring hook or a pair of needle-nose pliers, remove the retaining
spring. Refer to Figure 7–2.
6. Push the latch bar forward until it clears the the retaining latch. Refer to
Figure 7–5.
7. Push the retaining latch upward past the retaining clip.
8. To reassemble, reverse this procedure.
Retaining
Latch
Latch Bar
Front Panel
Figure 7–5: Removing the Latch Bar Assembly
7–6
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Disassembly
Front Panel Disassembly
This procedure describes how to disassemble and reassemble the front panel
assembly. Refer to Figures 7–6 and 7–7 when performing this procedure.
1. Remove the front panel from the Amplifier chassis (described earlier).
2. Remove the knob by firmly pushing against shaft from the rear of the panel.
3. Unplug the Peltola connector from the back of the BNC connector.
4. Using a !2 inch wrench, remove the retaining nut on the back of the BNC
connector and remove the washer.
5. Pull the BNC connector out of the front panel. (To reassemble, align the flat
spot of the connector’s threaded end with the flat spot of the front panel hole
and push the connector into the front panel. Perform steps 1 through 3 in
reverse order.)
BNC Connector
Output Cable
with Peltola
Connector
Front
Panel
Washer
Nut
Shield Plate
Figure 7–6: Removing the Amplifier Output Connector
6. Slide the shield plate and input connector assembly down and lift it out of
the way.
7. Unsnap the three retaining clips holding the front panel circuit board in place
and lift the board out of the panel.
8. To reassemble, reverse this procedure
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7–7
Disassembly
Nut
Washer
Shield Plate
Circuit Board
Retaining Clip
Retaining Clip
Front Panel
Knob
Figure 7–7: Removing the Amplifier Front Panel Board
Using the Rear Interface Output Connector
Some Power Modules support an option to reroute the plug-in instrument output
to the rear interface of the power module (refer to the Tektronix catalog or
contact your Tektronix sales representative). You can configure the AM 503B
and AM 5030 for this type of power module by following these steps. Refer to
Figure 7–8 as necessary.
NOTE. If you use the power module rear interface connector, high frequency
performance may be degraded, depending on your system configuration. If high
frequency performance is critical, route a BNC cable from the front panel OUTPUT
connector to your system.
1. Remove the left side cover.
2. Locate the output cable with the Peltola connector that plugs into the rear of
the front panel BNC output connector. Refer to Figure 7–8.
3. Carefully withdraw the output cable from the BNC output connector.
4. AM 5030 only: Using a Torx #T-10 screwdriver, remove the three screws
holding the GPIB circuit board in place. Slide the board towards the front
panel until the edge connector is free, and then lift the card out of the way.
5. Taking care to prevent damage to the easily bent center conductor, insert the
output cable into the rear interface output connector as shown in Figure 7–8.
7–8
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Disassembly
6. AM 5030 only: Replace the GPIB circuit board by guiding the edge
connector through the back plane and replacing the three hold-down screws.
7. To restore instrument output to the front panel BNC output connector,
reverse the procedure.
Front-Panel BNC
Output Connector
Rear Interface
Output Connector
Output Cable
Figure 7–8: Using the Rear Interface Output Connector
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7–9
Disassembly
Battery Replacement
This procedure describes how to replace the Amplifier backup battery.
1. Using a small flat-blade screwdriver, gently pry against the battery terminal
as shown in Figure 7–9 until the battery just starts to slide out.
CAUTION. Avoid using excessive force when prying against the battery terminal.
Excessive force can damage the spring tension of the terminal, resulting in poor
battery contact or no contact at all.
Flat-Blade
Screwdriver
Terminal
Battery
Figure 7–9: Prying Battery Terminal to Remove Battery
2. Once the battery starts to slide out, push against the edge of the battery with
the screwdriver blade until the battery is completely out. Figure 7–10
illustrates this action.
Figure 7–10: Removing the Backup Battery
7–10
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Disassembly
3. To replace the battery, gently pry up on the battery terminal as shown in
Figure 7–11 and push the battery into place.
CAUTION. Observe the proper polarity for the battery. The + side should be
exposed on top. Improper polarity can damage the instrument.
Gently pry the terminal up with the
screwdriver and push the battery in.
Figure 7–11: Replacing the Backup Battery
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7–11
Disassembly
7–12
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Replaceable Mechanical Parts
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Replaceable Parts
This section contains a list of the components that are replaceable for the
AM 503B and AM 5030. 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:
H
Part number
H
Instrument type or model number
H
Instrument serial number
H
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
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.
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8–1
Replaceable Parts
Indentation System
This parts list is indented to show the relationship between items. The following
example is of the indentation system used in the Description column:
1
2
3
4
5
Name & Description
Assembly and/or Component
Attaching parts for Assembly and/or Component
(END ATTACHING PARTS)
Detail Part of Assembly and/or Component
Attaching parts for Detail Part
(END ATTACHING PARTS)
Parts of Detail Part
Attaching parts for Parts of Detail Part
(END ATTACHING PARTS)
Attaching parts always appear at the same indentation as the item it mounts,
while the detail parts are indented to the right. Indented items are part of, and
included with, the next higher indentation. Attaching parts must be purchased
separately, unless otherwise specified.
Abbreviations
8–2
Abbreviations conform to American National Standards Institute (ANSI)
standard Y1.1.
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AM 503B & AM 5030 Replaceable Parts
13
14
12
11
10
6
5
16
15
4
9
3
17
18
8
7
A4
2
20
1
19
21
A3
22
A1
23
24
25
A2
26
38
28
29
37
27
33
30
34
28
31
32
36
35
Figure 8–1: AM 503B & AM 5030 Replaceable Parts
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8–3
AM 503B & AM 5030 Replaceable Parts
Fig. &
Index
No.
Tektronix
Part No.
Serial No.
Effective Dscont
Qty
12345 Name & Description
Mfr.
Code
Mfr. Part No.
337-3211-00
2
SHIELD,ELEC:SIDE ASSEMBLY
TK1465
ORDER BY DESC
174-2314-00
2
53387
ORDER BY DESC
174-2314-00
1
CA ASSY,SP,ELEC:20,28 AWG,6.0 L,FLAT
(AM5030 ONLY)
CA ASSY,SP,ELEC:20,28 AWG,6.0 L,FLAT
(AM503B ONLY)
53387
ORDER BY DESC
-3
175-5534-00
1
CABLE ASSY,RF:50 OHM COAX,6.25L,
9-2,PELTOLA X PELTOLA
80009
175553400
-4
160-9565-01
1
IC,MEMORY:CMOS,EPROM;32K X 8,PRGM
156-3503-00,27C256,DIP28.6,GPIB ROM,200NS
(AM5030 ONLY)
80009
160956501
-5
156-1415-00
1
IC,DIGITAL:LSTTL,TRANSCEIVER;OCTAL
IEEE-488GPIB BUS MGT
(AM5030 ONLY)
01295
SN75161BN
-6
156-1414-00
1
IC,DIGITAL:LSTTL,TRANSCEIVER;OCTAL
IEEE-488GPIB BUS XCVR
(AM5030 ONLY)
01295
SN75160BN
-7
160-9569-00 B010001 B010099 1
IC,PROCESSOR:CMOS,MICROCOMPUTER;
8-BIT,16MHZ,32K X 8 OTP EPROM,512 X 8 RAM
(AM5030 ONLY)
80009
160956900
160-9569-01 B010100 B019999 1
IC,PROCESSOR:CMOS,MICROCOMPUTER;
8-BIT,16MHZ,32K X 8 OTP EPROM,512 X 8 RAM
(AM5030 ONLY)
80009
160956901
160-9569-01 B010000 B019999 1
IC,PROCESSOR:CMOS,MICROCOMPUTER;
8-BIT,16MHZ,32K X 8 OTP EPROM,512 X 8 RAM
(AM503B ONLY)
80009
160956901
160-9569-02 B020000
1
IC,PROCESSOR:CMOS,MICROCOMPUTER;
8-BIT,16MHZ,32K X 8 OTP EPROM,512 X 8 RAM
(AM503B AND AM5030)
80009
160956902
146-0087-00
1
BATTERY,DRY:1.5V,SILVER OXIDE,600MAH,2/3 AA
SIZE W/PC TABS
61058
SP389
8-1-1
-2
-8
-9
159-0204-00
5
FUSE,WIRE LEAD:3.0A,125V,5 SECONDS
61857
SP7-3A
-10
211-0101-00
2
SCREW,MACHINE:4-40 X 0.25,FLH,100 DEG,STL
TK0435
ORDER BY DESC
-11
214-3406-00
1
SPRING,FLAT:1.48 L X 0.125 W,CU BE
TK1326
ORDER BY DESC
-12
426-0725-24
1
FR SECT,PLUG-IN:TOP
TK1465
ORDER BY DESC
-13
211-0101-00
1
SCREW,MACHINE:4-40 X 0.25,FLH,100 DEG,STL
TK0435
ORDER BY DESC
-14
214-3089-01
1
LOCKOUT,PLUG-IN:PLASTIC
(AM5030 ONLY)
0JR05
ORDER BY DESC
-15
210-0406-00
1
NUT,PLAIN,HEX:4-40 X 0.188,BRS CD PL
73743
12161-50
-16
386-4910-00
1
SUPPORT,FRAME:REAR
TK1943
ORDER BY DESC
-17
213-0882-00
2
SCREW,TPG,TR:6-32 X 0.437 TAPTITE,PNH,STL
0KB01
ORDER BY DESC
-18
211-0408-00
1
SCR,ASSEM WSHR:4-40 X 0.250,PNH,STL
TORXT10
(AM5030 ONLY)
93907
829-06815-024
-19
386-3657-01
2
SUPPORT,PLUG-IN:
83486
ORDER BY DESC
-20
220-0729-00
1
NUT BLOCK:4-40 X 0.188,BRS NP
(AM5030 ONLY)
80009
220072900
-21
210-0406-00
2
NUT,PLAIN,HEX:4-40 X 0.188,BRS CD PL
73743
12161-50
8–4
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AM 503B & AM 5030 Replaceable Parts
Fig. &
Index
No.
Tektronix
Part No.
Serial No.
Effective Dscont
Qty
12345 Name & Description
Mfr.
Code
Mfr. Part No.
-22
210-1178-00
2
WASHER,SHLDR:U/W TO-220 TRANSISTOR
13103
7721-7PPS
-23
342-0967-00
2
INSULATOR,PLATE:TRANSISTOR,SILCONE
RUBBER WITH ADHESIVE
80009
342096700
-24
214-3089-01
1
LOCKOUT,PLUG-IN:PLASTIC
(AM5030 ONLY)
0JR05
ORDER BY DESC
-25
426-0724-30
1
FR SECT,PL-IN:BOTTOM
TK1465
ORDER BY DESC
-26
211-0101-00
2
SCREW,MACHINE:4-40 X 0.25,FLH,100 DEG,STL
TK0435
ORDER BY DESC
-27
211-0101-00
2
SCREW,MACHINE:4-40 X 0.25,FLH,100 DEG,STL
TK0435
ORDER BY DESC
-28
131-1315-01
1
CONN,RF JACK:BNC/PNL,;50 OHM,FEMALE,
STR,PELTOLA/REAR PNL,SILVER/BRIGHT
ALLOY,0.576 MLGX 0.366 TERMN,0.375-32
THD,D-FLAT
24931
28JR306-1
-29
337-3927-01
1
SHIELD,ELEC AS:W/CONNECTOR & FLEX BOARD 80009
337392701
-30
214-3143-00
1
SPRING,HLEXT:0.125 OD X 0.545 L,XLOOP
8X345
ORDER BY DESC
-31
105-0866-00
1
LATCH,RETAINING:
0JR05
ORDER BY DESC
-32
105-0865-00
1
BAR,LATCH RLSE:
0JR05
ORDER BY DESC
-33
366-0733-00
3
KNOB,KEYCAP:UNLIT
0KBZ5
ORDER BY DESC
-34
366-0732-00
3
0KBZ5
ORDER BY DESC
366-0732-00
2
KNOB,KEYCAP:LIGHTED
(AM5030 ONLY)
KNOB,KEYCAP:LIGHTED
(AM503B ONLY)
0KBZ5
ORDER BY DESC
PANEL,FRONT:W/ID LABEL
(AM5030 ONLY)
FR PANEL ASSY: W/ID LABEL
(AM5030 ONLY)
80009
386005001
80009
614092600
-35
386-0050-01 B010001 B010019 1
614-0926-00 B010020
1
614-0924-00
1
FR PANEL ASSY: W/ID LABEL
(AM503B ONLY)
80009
614092400
-36
366-1851-02
1
KNOB,LATCH:IVORY GRAY,
POLYCARBONATE,1.09 X 0.250
0JR05
ORDER BY DESC
-37
366-2111-00
1
KNOB:SMALL,FLUTED
TK1163
ORDER BY DESC
-38
384-1695-00
1
SHAFT,EXTENSION:1.550 L,0.264 DIA,DELRIN
80009
384169500
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8–5
AM 503B & AM 5030 Replaceable Parts
Fig. &
Index
No.
Tektronix
Part No.
Serial No.
Effective Dscont
Qty
12345 Name & Description
Mfr.
Code
Mfr. Part No.
8-2STANDARD ACCESSORIES
-1
-2
011-0049-01
012-0057-01
1
1
070-8766-04
070-8770-01
1
1
TERMN,COAXIAL:50 OHM,2W,BNC
CA ASSY,RF:COAXIAL,;RFD,50 OHM,43 L,
BNC,MALE,STR,BOTH ENDS,W/STRAIN RELIEF
BOOT BOTH ENDS
MANUAL,TECH:INSTR,AM503B/AM5030
MANUAL,TECH:REF AM503B/AM5030
64537
80009
T132DS
012005701
80009
80009
070876604
070877001
64537
22526
JA-120S
81190-020
OPTIONAL ACCESSORIES
015-0601-50
012-0991-00
1
ADAPTER:1 TURN CURRENT LOOP,5O OHM
CABLE,INTCON:SHLD CMPST,GPIB;CRC,12 TW
PR,24,28 AWG,2 METER,DUAL SHIELD,24 POS,
0.085 CTR,RIBBON,FEEDTHRU,BOTH ENDS
2
1
Figure 8–2: AM 503B & AM 5030 Standard Accessories
8–6
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AM 503B & AM 5030 Replaceable Parts
CROSS INDEX - MFR. CODE NUMBER TO MANUFACTURER
Mfr.
Code
Manufacturer
Address
City, State, Zip Code
TK0392
NORTHWEST FASTENER SALES INC
7923 SW CIRRUS DRIVE
BEAVERTON OR 97005-6448
TK0435
LEWIS SCREW CO
4300 S RACINE AVE
CHICAGO IL 60609-3320
TK1163
POLYCAST INC
9898 SW TIGARD ST
TIGARD OR 97223
TK1326
NORTHWEST FOURSLIDE INC
18224 SW 100TH CT
TUALATIN OR 97062
TK1465
BEAVERTON PARTS MFG CO
1800 NW 216TH AVE
HILLSBORO OR 97124-6629
TK1943
NEILSEN MANUFACTURING INC
3501 PORTLAND ROAD NE
SALEM OR 97303
0JR05
TRIQUEST CORP
3000 LEWIS AND CLARK HWY
VANCOUVER WA 98661-2999
0KBZ5
MORELLIS Q & D PLASTICS
1812 16TH AVE
FOREST GROVE OR 97116
0KB01
STAUFFER SUPPLY
810 SE SHERMAN
PORTLAND OR 97214
00779
AMP INC
2800 FULLING MILL, PO BOX 3608
HARRISBURG PA 17105
01295
TEXAS INSTRUMENTS INC
SEMICONDUCTOR GROUP
13500 N CENTRAL EXPY
PO BOX 655303
DALLAS TX 75262-5303
02768
ILLINOIS TOOL WORKS INC
FASTEX DIVISION
195 ALGONQUIN ROAD
DES PLAINES IL 60016-6103
04811
PRECISION COIL SPRING CO
10107 ROSE ST, PO BOX 5450
EL MONTE CA 91734
05469
BEARINGS INC
3634 EUCLID, PO BOX 6925
CLEVELAND OH 44101
12327
FREEWAY CORP
9301 ALLEN DR
CLEVELAND OH 44125-4632
13103
THERMALLOY CO INC
2021 W VALLEY VIEW LN
PO BOX 810839
DALLAS TX 75381
22526
BERG ELECTRONICS INC (DUPONT)
857 OLD TRAIL RD
ETTERS PA 17319
24931
SPECIALTY CONNECTOR CO INC
2100 EARLYWOOD DR, PO BOX 547
FRANKLIN IN 46131
3M099
PORTLAND SCREW CO
6520 N. BASIN ST
PORTLAND, OR 97217-3920
50394
SPS TECHNOLOGIES INC
UNBRAKO DIV
HIGHLAND AVE
JENKINTOWN PA 19046
53387
MINNESOTA MINING MFG CO
PO BOX 2963
AUSTIN TX 78769-2963
61058
MATSUSHITA ELECTRIC CORP OF
AMERICA
PANASONIC INDUSTRIAL CO DIV
TWO PANASONIC WAY
SECAUCUS NJ 07094
61857
SAN-0 INDUSTRIAL CORP
91-3 COLIN DRIVE
HOLBROOK NY 11741
64537
KDI ELECTRONICS INC
SUBSIDIARY OF KDI CORP
31 FARINELLA DR
EAST HANOVER NJ 07936
73743
FISCHER SPECIAL MFG CO
111 INDUSTRIAL RD
COLD SPRING KY 41076-9749
8X345
NORTHWEST SPRING & MFG CO
5858 WILLOW LANE
LAKE OSWEGO OR 97034-5343
80009
TEKTRONIX INC
14150 SW KARL BRAUN DR
PO BOX 500
BEAVERTON OR 97077-0001
83486
ELCO INDUSTRIES INC
1101 SAMUELSON RD
ROCKFORD IL 61101
91260
CONNOR SPRING AND MFG CO
A SLOSS AND BRITTAN INC CO
1729 JUNCTION AVE
SAN JOSE CA 95112
93907
TEXTRON INC
CAMCAR DIV
600 18TH AVE
ROCKFORD IL 61108-5181
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8–7
AM 503B & AM 5030 Replaceable Parts
8–8
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Glossary and Index
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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 AM 503B and
AM 5030 circuitry to ensure maximum measurement accuracy. This process
is performed during the probe degauss routine.
bucking current
Current fed back by the AM 503B and AM 5030 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.
AM 503B & AM 5030 Amplifier Instruction Manual
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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 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 AM 503B and AM 5030 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
AM 503B & AM 5030 Amplifier Instruction Manual
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Index
Numbers
B
20MHz BW LIMIT button, 2–10
20MHz BW LIMIT indicator, 2–10
bandwidth limits, 2–10, 3–2
battery
low indicator, 3–19
replacement, 7–10
bucking current, 3–6, Glossary–1
BWLIMit Command, 2–22
A
A6302 & A6302XL
adjustments, 6–3
bandwidth check, 5–17
dc accuracy check, 5–21
dc offset adjustment, 6–3
performance verification, 5–15
rise time check, 5–19
A6303 & A6303XL
adjustments, 6–7
bandwidth check, 5–28
dc accuracy check, 5–32
dc offset adjustment, 6–8
gain adjustment, 6–10
performance verification, 5–27
rise time check, 5–30
transient response adjustment, 6–10
A6304XL
adjustments, 6–13
bandwidth check, 5–40
dc accuracy adjustment, 6–16
dc accuracy check, 5–40
dc offset adjustment, 6–14
performance verification, 5–37
rise time check, 5–38
transient response adjustment, 6–18
A6312
adjustments, 6–3
bandwidth check, 5–5
dc accuracy check, 5–9
dc offset adjustment, 6–3
performance verification, 5–3
rise time check, 5–7
AC coupling, 2–4, 2–10, 3–3
adjustments
degauss, 2–3
oscilloscope, 1–7, 7–8
ALLEve? command, 2–21
amp–second product, 3–4, Glossary–1
AMPS Command, 2–21
applications, 3–9
auto-balance, Glossary–1
autobalance function, 2–8
C
cable
IEEE Std 488.1–1987, 2–13
stacking GPIB, 2–13
changing the operating voltage, 1–4
cleaning, 7–1
commands
ALLEve?, 2–21
AMPS, 2–21
BWLIMit, 2–22
COUpling, 2–22
DCLEVel, 2–23
DEGAuss, 2–23
ERRor?, 2–24
EVent?, 2–24
EXit, 2–24
FPLock, 2–25
HELp?, 2–25
ID?, 2–26
INIT, 2–26
OVerload?, 2–26
PATH, 2–27
PROBEOPen?, 2–27
PROBETRim, 2–28
PROBETYpe?, 2–29
RQS, 2–29
SERIAL?, 2–30
SET?, 2–30
TEST, 2–31
UNIts?, 2–31
computer. See controller, GPIB
connector, IEEE Std 488.1–1987, 2–13
continuity measurements, 3–14
control summary, 2–7
controller, GPIB, 2–13
conventional current, Glossary–1
See also electron current
COUPLING button, 2–10
COUpling Command, 2–22
AM 503B & AM 5030 Amplifier Instruction Manual
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Index–1
Index
coupling modes, 3–3
CT–4 high–current adapter, 1–4, 3–7
current limitations
amp–second product, 3–4
maximum continuous, 3–4
maximum pulsed, 3–4
current probe calibration, 6–1
customer support, 1–1
GPIB Address, 2–14
GPIB ADDRESS button, 2–12
GPIB ADDRESS indicator, 2–12
GPIB Connector, 2–13
GPIB Operation, 2–13
GPIB Parameters, 2–14
GPIB terminator, 2–12, 2–15
H
D
DC coupling, 2–10, 3–3
DC LEVEL control, 2–4, 2–5, 2–8, 3–3
DCLEVel Command, 2–23
DEGAuss Command, 2–23
degauss function, 2–2, 2–8, Glossary–1
differential current, 3–2
disassembly
front panel, 7–4
knobs, 7–4
precautions, 7–3
release lever, 7–4
side covers, 7–4
E
electron current, Glossary–1
See also conventional current
error codes, 3–17
error 266, 3–19
error 357, 3–19
LO, 3–19
ERRor? Command, 2–24
EVent? Command, 2–24
EXit Command, 2–24
extending the current range of the probes, 3–5
Hall device, Glossary–2
Hall effect, Glossary–2
HELp? Command, 2–25
I
ID? Command, 2–26
IEEE Std 488.1–1987, 2–13
increasing bucking current, 3–6
increasing probe sensitivity, 3–7
indicator
20MHz BW LIMIT, 2–10
GPIB ADDRESS, 2–12
OVERLOAD, 2–8
PROBE DEGAUSS/AUTOBALANCE, 2–9
PROBE OPEN, 2–8
REMOTE, 2–12
SRQ, 2–12
inductance measurements, 3–11
INIT Command, 2–26
INPUT connector, 2–11
insertion impedance, Glossary–2
L
LO error code, 3–19
locking the probes, 2–1
F
flux, Glossary–1
FPLock Command, 2–25
frequency derating, 3–4
front panel controls, 2–7
G
gain adjustment. See trim adjust
Gauss, Glossary–1
GPIB
Configurations, 2–14
Connection rules, 2–14
Index–2
M
maintenance, 7–1
maximum continuous current rating, 3–4
maximum pulsed current rating, 3–4
measuring continuity, 3–14
measuring current
AC, 2–4
current nulls, 3–2
DC, 2–3
differential current, 3–2
measuring inductance, 3–11
mechanical parts, 8–1
AM 503B & AM 5030 Amplifier Instruction Manual
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Index
N
R
noise, 3–2
null current, 3–2
rear interface output, 7–8
REF coupling, 2–10
release lever, 2–11
REMOTE indicator, 2–12
replaceable mechanical parts, 8–1
RQS Command, 2–29
O
optional accessories, 1–3
output cable, moving, 7–8
OUTPUT connector, 2–11
output, rear interface, 7–8
OVERLOAD indicator, 2–8
OVerload? Command, 2–26
P
PATH Command, 2–27
PROBE DEGAUSS/AUTOBALANCE button, 2–2,
2–8
PROBE DEGAUSS/AUTOBALANCE indicator, 2–9
PROBE OPEN indicator, 2–8
probe trim adjust, 2–10
PROBEOPen? Command, 2–27
probes
bandwidth considerations, 3–2
coupling, 3–3
degaussing (demagnetizing), 2–2, 2–8
description, 1–2
increasing the current limit, 3–5
maintenance, 7–1
maximum current limits, 3–4
operation, 2–1
saturation, 3–4
PROBETRim Command, 2–28
PROBETYpe? Command, 2–29
S
saturation, Glossary–2
SERIAL? Command, 2–30
SET? Command, 2–30
specifications, 4–1
probe serial numbers, 4–1
SRQ indicator, 2–12
susceptibility, Glossary–2
T
termination resistor, 1–7
TEST Command, 2–31
troubleshooting, 3–19
U
UNIts? Command, 2–31
V
voltage selector, 1–4
AM 503B & AM 5030 Amplifier Instruction Manual
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Index–3
Index
Index–4
AM 503B & AM 5030 Amplifier Instruction Manual
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
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