Agilent Technologies U3402A Technical data

Keysight U3402A
5 1/2 Digit Dual Display
Multimeter
User’s and
Service Guide
Notices
© Keysight Technologies 2009 - 2015
Warranty
No part of this manual may be reproduced in
any form or by any means (including electronic storage and retrieval or translation
into a foreign language) without prior agreement and written consent from Keysight
Technologies as governed by United States
and international copyright laws.
The material contained in this document is provided “as is,” and is subject to being changed, without notice,
in future editions. Further, to the maximum extent permitted by applicable
law, Keysight disclaims all warranties, either express or implied, with
regard to this manual and any information contained herein, including
but not limited to the implied warranties of merchantability and fitness for
a particular purpose. Keysight shall
not be liable for errors or for incidental or consequential damages in connection with the furnishing, use, or
performance of this document or of
any information contained herein.
Should Keysight and the user have a
separate written agreement with
warranty terms covering the material
in this document that conflict with
these terms, the warranty terms in the
separate agreement shall control.
Manual Part Number
U3402-90001
Edition
Edition 9, March 20, 2015
Printed in Malaysia
Keysight Technologies
1400 Fountaingrove Parkway
Santa Rosa, CA 95403
Technology Licenses
The hardware and/or software described in
this document are furnished under a license
and may be used or copied only in accordance with the terms of such license.
Restricted Rights Legend
U.S. Government Restricted Rights. Software and technical data rights granted to
the federal government include only those
rights customarily provided to end user customers. Keysight provides this customary
commercial license in Software and technical data pursuant to FAR 12.211 (Technical
Data) and 12.212 (Computer Software) and,
for the Department of Defense, DFARS
252.227-7015 (Technical Data - Commercial
Items) and DFARS 227.7202-3 (Rights in
Commercial Computer Software or Computer Software Documentation).
U3402A User’s and Service Guide
Safety Notices
CAUTION
A CAUTION notice denotes a hazard. It calls attention to an operating procedure, practice, or the like
that, if not correctly performed or
adhered to, could result in damage
to the product or loss of important
data. Do not proceed beyond a
CAUTION notice until the indicated
conditions are fully understood and
met.
WA R N I N G
A WARNING notice denotes a
hazard. It calls attention to an
operating procedure, practice, or
the like that, if not correctly performed or adhered to, could result
in personal injury or death. Do not
proceed beyond a WARNING
notice until the indicated conditions are fully understood and
met.
III
Safety Symbols
The following symbol on the instrument and in the documentation
indicates precautions that must be taken to maintain safe operation of the
instrument.
CAT II
300 V
IV
Direct current (DC)
Caution, risk of electric shock
Alternating current (AC)
Caution, risk of danger (refer to this
manual for specific Warning or Caution
information)
Both direct and alternating current
Out position of a bi-stable push control
Earth (ground) terminal
In position of a bi-stable push control
Protective conductor terminal
Frame or chassis terminal
IEC Measurement Category II. Inputs may
be connected to mains (up to 300 VAC)
under Category II overvoltage conditions.
U3402A User’s and Service Guide
Regulatory Markings
The CE mark is a registered trademark
of the European Community. This CE
mark shows that the product complies
with all the relevant European Legal
Directives.
The C-tick mark is a registered
trademark of the Spectrum
Management Agency of Australia. This
signifies compliance with
the Australia EMC Framework
regulations under the terms of the
Radio Communication Act of 1992.
ICES/NMB-001 indicates that this ISM
device complies with the Canadian
ICES-001.
Cet appareil ISM est confomre a la
norme NMB-001 du Canada.
This instrument complies with the
WEEE Directive (2002/96/EC) marking
requirement. This affixed product label
indicates that you must not discard
this electrical/electronic product in
domestic household waste.
The CSA mark is a registered
trademark of the Canadian Standards
Association.
This symbol indicates the time period
during which no hazardous or toxic
substance elements are expected to
leak or deteriorate during normal use.
Forty years is the expected useful life
of the product.
U3402A User’s and Service Guide
V
General Safety Information
The following general safety precautions must be observed during all
phases of operation, service, and repair of this instrument. Failure to
comply with these precautions or with specific warnings elsewhere in this
manual violates safety standards of design, manufacture, and intended
use of the instrument. Keysight Technologies assumes no liability for the
customer’s failure to comply with these requirements.
WA R N I N G
VI
• Do not exceed any of the measurement limits defined in the specifications to
avoid instrument damage and the risk of electric shock.
• Do not defeat power cord safety ground feature. Plug in to a grounded (earthed)
outlet.
• Do not use instrument in any manner that is not specified by the manufacturer.
• Double-check the instrument’s operation by measuring a known voltage.
• For current measurement, turn off circuit power before connecting the
instrument to the circuit. Always place the instrument in series with the circuit.
• When connecting probes, always connect the common test probe first. When
disconnecting probes, always disconnect the live test probe first.
• Do not measure more than the rated voltage (as marked on the multimeter)
between terminals, or between terminal and earth ground.
• Do not use repaired fuses or short-circuited fuse-holders. For continued
protection against fire, replace the line fuses only with fuses of the same voltage
and current rating and recommended type.
• Do not service or perform adjustments alone. Under certain conditions,
hazardous voltages may exist, even with the instrument switched off. To avoid
dangerous electric shock, service personnel must not attempt internal service or
adjustment unless another person, capable of rendering resuscitation or first aid,
is present.
• Do not substitute parts or modify instrument to avoid the danger of introducing
additional hazards. Return the instrument to Keysight Technologies Sales and
Service Office for service and repair to ensure the safety features are maintained.
• Do not operate damaged instrument as the safety protection features built into
this instrument may have been impaired, either through physical damage,
excessive moisture, or any other reason. Remove power and do not use the
instrument until safe operation can be verified by service-trained personnel. If
necessary, return the instrument to Keysight Technologies Sales and Service
Office for service and repair to ensure the safety features are maintained.
U3402A User’s and Service Guide
CAUTION
• Turn off circuit power and discharge all high-voltage capacitors in the circuit before
you perform resistance, continuity, or diode tests.
• Use the correct terminals, functions, and range for your instrument.
• Do not measure voltage when current measurement is selected.
• Use the instrument with the cables provided.
• Repair or service that is not covered in this manual should only be performed by
qualified personnels.
U3402A User’s and Service Guide
VII
Environmental Conditions
This instrument is designed for indoor use and in an area with low
condensation. The table below shows the general environmental
requirements for the instrument.
NOTE
Requirements
Operating temperature
Full accuracy from 0 °C to 50°C (Operating)
Operating humidity
Full accuracy up to 80 % R.H. (relative humidity)
for temperature up to 28°C
Storage temperature
–20 °C to 60 °C (Non-operating)
Altitude
Operating up to 2,000 metres (6,562 feet)
Pollution degree
Pollution Degree 2
The Keysight U3402A 5 1/2 digit dual display multimeter complies with
the following EMC requirements:
•
•
•
•
•
•
VIII
Environmental Conditions
IEC 61010-1:2001/EN61010-1:2001 (2nd Edition)
Canada: CAN/CSA-C22.2 No. 61010-1-04
USA: ANSI/UL 61010-1:2004
IEC 61326-1:2005/EN 61326-1:2006
Canada: ICES/NMB-001: Issue 4, June 2006
Australia/New Zealand: AS/NZS CISPR11:2004
U3402A User’s and Service Guide
Waste Electrical and Electronic Equipment (WEEE) Directive
2002/96/EC
This instruction complies with the WEEE Directive (2002/96/EC) marking
requirement. This affixed product label indicates that you must not discard
this electrical/electronic product in domestic household waste.
Product Category:
With reference to the equipment types in the WEEE directive Annex 1, this
instrument is classified as a “Monitoring and Control Instrument” product.
The affixed product label is shown as below:
Do not dispose in domestic household waste
To return this unwanted instrument, contact your nearest Keysight office,
or visit
www.keysight.com/environment/product
for more information.
U3402A User’s and Service Guide
IX
Declaration of Conformity (DoC)
The Declaration of Conformity (DoC) for this instrument is available on the
Web site. You can search the DoC by its product model or description.
http://regulations.products.keysight.com/DoC/search.htm
NOTE
X
If you are unable to search for the respective DoC, please contact your
local Keysight representative.
U3402A User’s and Service Guide
In This Guide ...
1
Getting Started Tutorial
This chapter provides an introduction to the U3402A digital multimeter and
a tutorial showing how to use the front panel in order to make
measurements.
2
Operations and Features
This chapter explains the various functions and features available to the
U3402A digital multimeter.
3
Application Tutorial
This chapter describes the advanced features and the possible
applications for effective operation of the multimeter.
4
Performance Test
This chapter contains performance test procedures. The performance test
procedures allow you to verify that the multimeter is operating within its
published specifications.
5
Disassembly and Repair
This chapter will help you troubleshoot a faulty multimeter. It describes
how to disassemble the multimeter, how to obtain repair services, and
lists the replaceable parts.
6
Specifications and Characteristics
This chapter describes the multimeter’s specifications and operating
specifications
U3402A User’s and Service Guide
XI
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XII
U3402A User’s and Service Guide
Contents
1
Getting Started Tutorial
Introducing the Keysight U3402A Dual Display Multimeter
Checking the shipping contents 3
Connecting power to the multimeter 4
Stacking the U3402A
5
Adjusting the Handle
6
2
Product at a Glance 7
Product dimensions 7
The front panel at a glance 8
The display at a glance 9
The keypad at a glance 11
The terminals at a glance 14
The rear panel at a glance 16
Making Measurements 17
Performing voltage measurements 18
Performing current measurements 20
Performing frequency measurements 22
Performing resistance measurements 23
Performing diode/continuity test 25
Selecting a Range
30
Setting the Reading Rate
2
32
Operations and Features
Operating Math Operations
dBm 35
Rel 36
MinMax 37
Comp 39
U3402A User’s and Service Guide
34
XIII
Hold
40
Combination of Math Operations
Using the Secondary Display
41
43
Using the Setup Menu 45
Changing the Configurable Settings
3
46
Application Tutorial
Applications for Using Dual Display
52
Dual Display Operation Examples 53
Measure DC Voltage and AC Ripple on a Rectification Circuit 53
Measure AC and DC Current on a Rectification Circuit 54
Measure AC Voltage and Frequency on an AC Circuit 55
Measure DC Voltage and DC Current on a Transistor Circuit or Load
Measure Resistance Using 2-Wire Mode 58
Measure Resistance Using 4-Wire Mode 59
Measure True RMS AC+DC 60
4
Performance Test
Calibration Overview 62
Keysight Technologies Calibration Services
Calibration Interval 62
Recommended Test Equipment
Test Considerations
64
65
Disassembly and Repair
Operating Checklist 76
Types of Service Available
Repackaging for Shipment
XIV
62
63
Performance Verification Test Overview
Performance Verification Test 65
5
56
77
78
U3402A User’s and Service Guide
Cleaning 78
To Replace the Power Line Fuse 79
To Replace a Current Input Fuse 80
Electrostatic Discharge (ESD) Precautions
Mechanical Disassembly 81
Replaceable Parts 87
To order replaceable parts
6
80
87
Specifications and Characteristics
DC Specifications
90
AC Specifications
93
Decibel (dB) Calculation
97
Supplemental Measurement Specifications
Display update rate 98
Measurement specifications 98
Reading rates 105
General Characteristics
98
107
To Calculate Total Measurement Error
109
Accuracy Specifications 110
Transfer Accuracy 110
One-Year Accuracy 110
Temperature Coefficients 110
Configuring for Highest Accuracy Measurements
U3402A User’s and Service Guide
111
XV
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XVI
U3402A User’s and Service Guide
List of Tables
Table 1-1
Table 1-2
Table 1-3
Table 1-4
Table 1-5
Table 2-1
Table 2-2
Table 2-3
Table 2-4
Table 3-1
Table 4-1
Table 4-2
Table 4-3
Table 4-4
Table 4-5
Table 4-6
Table 4-7
Table 4-8
Table 4-9
Table 5-1
Table 5-2
Table 6-1
Table 6-2
Table 6-3
Table 6-4
Table 6-5
Table 6-6
Table 6-7
Table 6-8
Table 6-9
U3402A User’s and Service Guide
Display annunciators 9
Keypad functions 11
Input terminal for different measurement functions 15
Range scale value in slow, medium, and fast reading rate 31
Reading rates for single function measurements 32
Math operations for different measurement functions 34
Descriptions for combined math operations 42
Description for dual display combination 44
Setup menu and communication parameters 45
Typical combinations and applications when using dual display 52
Recommended test equipments 63
DC voltage verification test 66
DC current verification test 67
2-wire W verification test 68
4-wire W verification test 69
Diode verification test 71
Frequency verification test 71
AC volts verification test 72
AC current verification test 73
Type of supplied fuse (according to country of destination) 79
Type of current input fuse 80
DC resolution, full scale reading, and accuracy [±(% of reading +
count)] 90
AC voltage resolution, full scale reading, and accuracy [± (% of reading
+ count)] 93
AC voltageac+dc resolution, full scale reading, and accuracy [± (% of
reading + count)] 94
AC current resolution, full scale reading, burden voltage, and accuracy [±
(% of reading +
count)] 95
AC current ac+dc resolution, full scale reading, burden voltage, and accuracy [± (% of reading + count)] 96
Frequency resolution and accuracy [± (% of reading + count)] 96
Range and accuracy (±dB) 97
Full scale display update rates 98
Supplemental measurement specifications 98
XVII
Table 6-10 Reading rates for single display (readings/second (approx)) 105
Table 6-11 Reading rates for the dual display (readings/second (approx)) 106
Table 6-12 General characteristics 107
XVIII
U3402A User’s and Service Guide
List of Figures
Figure 1-1
Figure 1-2
Figure 1-3
Figure 1-4
Figure 1-5
Figure 1-6
Figure 1-7
Figure 1-8
Figure 1-9
Figure 1-10
Figure 1-11
Figure 1-12
Figure 1-13
Figure 1-14
Figure 1-15
Figure 1-16
Figure 1-17
Figure 1-18
Figure 1-19
Figure 1-20
Figure 2-1
Figure 2-2
Figure 2-3
Figure 2-4
Figure 2-5
Figure 2-6
Figure 2-7
Figure 2-8
Figure 3-1
Figure 3-2
Figure 3-3
U3402A User’s and Service Guide
Stacking the U3402A 5
Type of handle position 6
Attaching and detaching the handle. 6
U3402A dimensions 7
Front panel 8
VFD full display with all segments illuminated. 9
Keypad 11
Input terminal 14
Rear panel 16
ACV terminal connection and display 18
DCV terminal connection and display 19
ACI RMS or DCI (mA) terminal connection and display 20
ACI RMS or DCI (A) terminal connection and display 21
Frequency terminal connection and display 22
2-wire W terminal connection and display 24
4-wire W terminal connection and display 24
Forward-biased diode/continuity test terminal connection and
display 27
Reverse-biased diode/continuity terminal connection and display 27
2-wire/continuity test terminal connection and display 29
Reading rate annunciator 32
Typical dBm operation display 35
Typical Rel operation display 36
Typical Max operation display 37
Typical Min operation display 38
Typical Comp operation display 39
Typical Hold operation display 40
Combined math operations sequence 42
Secondary display 43
Terminal connection when measuring DC voltage and AC ripple on a
rectification circuit 53
Terminal connection when measuring AC and DC current on a rectification
circuit 54
Terminal connection when measuring AC voltage and frequency on an
AC circuit 55
XIX
Figure 3-4 Terminal connection when measuring DC voltage and DC current on a
transistor circuit or load 57
Figure 3-5 Terminal connection when measuring resistance using 2-wire
mode 58
Figure 3-6 Terminal connection when measuring resistance using 4-wire
mode 59
XX
U3402A User’s and Service Guide
U3402A 5 1/2 Digit Dual Display Multimeter
User’s and Service Guide
1
Getting Started Tutorial
Introducing the Keysight U3402A Dual Display Multimeter 2
Checking the shipping contents 3
Connecting power to the multimeter 4
Stacking the U3402A 5
Adjusting the Handle 6
Product at a Glance 7
Product dimensions 7
The front panel at a glance 8
The display at a glance 9
The keypad at a glance 11
The terminals at a glance 14
The rear panel at a glance 16
Making Measurements 17
Performing voltage measurements 18
Performing current measurements 20
Performing frequency measurements 22
Performing resistance measurements 23
Performing diode/continuity test 25
Selecting a Range 30
Setting the Reading Rate 32
This chapter provides an introduction to the U3402A digital
multimeter and a tutorial showing how to use the front
panel in order to make measurements.
1
Getting Started Tutorial
Introducing the Keysight U3402A Dual Display Multimeter
The key features of the U3402A dual display multimeter are:
• 5 ½–digit dual display measurement
• Eleven measurement functions:
• AC voltage
• DC voltage
• AC + DC voltage
• AC current
• DC current
• AC+DC current
• 2- wire resistance
• 4- wire resistance
• Frequency
• Continuity test
• Diode test
• Five math operations:
• dBm
• Min/Max
• Relative (Rel)
• Compare (Comp)
• Hold
• True RMS measurement for both AC+DC votage and current.
• Wide AC and DC current measurememt range; from 12 mA to 12 A.
• Resistance measurement up to 120 MW with 1 mW resolution at slow
reading rate or up to 300 MW with 10 mW and 100 mW resolution at medium
and fast reading rate respectively.
• Frequency measurement up to 1 MHz.
• dBm measurement with selectable reference impedance from 2 W to 8000 W
and audio power measurement capability.
• Dynamic recording for minimum and/or maximum readings.
2
U3402A User’s and Service Guide
Getting Started Tutorial
1
Checking the shipping contents
Verify that you have received the following items with your multimeter:
• Power cord
• Standard test lead kit
• Quick start guide
• Product reference CD
• Test report
• Certificate of calibration
Inspect the shipping container for damage. Signs of damage may include a
dented or torn shipping container or cushioning material that shows signs of
unusual stress or compacting.
Carefully remove the contents from the shipping container and verify that any
options ordered are included with the shipment by checking the packing list
included with the shipment.
If anything is missing, contact your nearest Keysight Sales Office.
NOTE
• If the shipping container or packaging material is damaged, it should be kept until the
contents have been checked mechanically and electrically. If there is mechanical
damage, notify the nearest Keysight Technologies office. Keep the damaged shipping
materials (if any) for inspection by the carrier and Keysight representative. If required,
you can find a list of Keysight Sales and Service Offices on the last page of this guide.
• Ensure you have read and understand the preceding safety information before
you proceed.
Original packaging
Containers and materials identical to those used in the factory pakaging are
available through Keysight Technologies office. If the multimeter is being
returned to Keysight Technologies for servicing, attach a tag indicating the
type
of service required, return address, model number, and serial number. Also
mark the container FRAGILE to assure careful handling. In any
U3402A User’s and Service Guide
3
1
Getting Started Tutorial
correspondence, refer to the multimeter by model number and serial number.
Connecting power to the multimeter
Connect the power cord and press the power switch to turn on the multimeter.
The front panel display illuminates while the multimeter performs its
power- on self- test. (If the multimeter does not power- on, refer to the
“Operating Checklist” on page 76). During the power- on session, press
to hold the full display. Press any key to resume the power- on self- test.
The multimeter powers up in the DC voltage function with autoranging
enabled. If self- test is successful, the multimeter goes to normal operation.
If the self- test fails, either a full annunciator or a blank display is displayed
without entering the normal operation. In the unlikely event that the self- test
repeatedly fails, contact your nearest Keysight Sales and Service Office.
NOTE
CAUTION
The multimeter will operate at any line voltage between 90 VAC and 264 VAC when the line
voltage selector is set properly with frequency range 50 Hz or 60 Hz.
• Before turning on the multimeter, make sure the line voltage selector is set to the
correct position for the applied line voltage to the power line cord connector.
• Do not apply a line voltage that exceeds the specified range of the line cord
connector.
4
U3402A User’s and Service Guide
Getting Started Tutorial
1
Stacking the U3402A
The U3402A is shipped with specially designed anti- slip protective bumpers
on the front panel and rear panel. The multimeters will not slide off when
stacked on top of each other.
To be able to stack the U3402A multimeters, ensure the attached bumpers are
in correct orientation. Refer to Figure 1- 1.
Figure 1-1 Stacking the U3402A
U3402A User’s and Service Guide
5
1
Getting Started Tutorial
Adjusting the Handle
To adjust the handle, grasp the handle by the side and pull outward. Then,
rotate the handle to the desired position. Figure 1- 2 below shows the possible
handle positions.
Carrying position
Benchtop
position
Handle removal position
Figure 1-2 Type of handle position
To attach or detach the handle, rotate the handle upright and pull it out from
the sides of the multimeter. Refer to Figure 1- 3.
Figure 1-3 Attaching and detaching the handle.
6
U3402A User’s and Service Guide
Getting Started Tutorial
1
Product at a Glance
Product dimensions
Front view
226.0 mm
Side view
105.0 mm
305.0 mm
Figure 1-4 U3402A dimensions
U3402A User’s and Service Guide
7
1
Getting Started Tutorial
The front panel at a glance
Primary display
Input terminals
and current fuse
Measurement
function
keypads
Autoranging,
manual range
and comparator
operation
Secondary display
Math
operation
keypads
Shift Power
on/off
switch
Figure 1-5 Front panel
8
U3402A User’s and Service Guide
Getting Started Tutorial
1
The display at a glance
Figure 1-6 VFD full display with all segments illuminated.
The highly visible vacuum fluorescent display (VFD) annunciator are
described in Table 1- 1.
Table 1-1 Display annunciators
Annunciator
Description
Primary display
S
Reading rate: Slow
M
Reading rate: Medium
F
Reading rate: Fast
PEAK
Peak measurement. Not applicable for the U3402A.
HOLD
Data hold
MIN
MinMax math operation: Minimum value shown on the primary display
MAX
MinMax math operation: Maximum value shown on the primary display
REL
Relative value
dBm
Decibel unit relative to 1 mW
42W
4-wire/2-wire resistance
Diode test
Audible continuity test for resistance
AUTO
Autoranging
DC
Direct current
AC
Alternating current
DCAC
AC + DC
Polarity, digits, and decimal points for primary display
U3402A User’s and Service Guide
9
1
Getting Started Tutorial
Table 1-1 Display annunciators
Annunciator
Description
ºC
Celcius temperature unit. Not applicable for the U3402A.
ºF
Fahrenheit temperature unit. Not applicable for the U3402A.
mV
Voltage unit: mV, V
µmA
Current unit: µA, mA, A
µmnF
Capacitance unit: nF, µF, mF. Not applicable for the U3402A.
MkW
Resistance unit: W, kW, MW
MkHz
Frequency unit: Hz, kHz, MHz
Secondary display
Polarity, digits, and decimal points for secondary display
10
µnmF
Capacitance unit: nF, µF, mF. Not applicable for the U3402A.
ºC
Celcius temperature unit. Not applicable for the U3402A.
ºF
Fahrenheit temperature unit. Not applicable for the U3402A.
%
Duty cycle measurement. Not applicable for the U3402A.
mV
Voltage unit: mV, V
µmA
Current unit: µA, mA, A
S
Shift mode
MkW
Resistance unit: W, kW, MW
MkHz
Frequency unit: Hz, kHz, MHz
2ND
Secondary display is enabled
AUTO
Autoranging
DC
Direct current
AC
Alternating current
DCAC
AC + DC
COMP
Compare operation
dBm
Decibel unit relative to 1 mW
CAL
Calibration mode. Not applicable for the U3402A.
EXT
External. Not applicable for the U3402A.
TRIG
Trigger mode. Not applicable for the U3402A.
REMOTE
Remote interface control. For calibration use only.
LOCAL
Local mode
STO
Store instrument state. Not applicable for the U3402A.
RCL
Recall stored instrument state. Not applicable for the U3402A.
U3402A User’s and Service Guide
Getting Started Tutorial
1
The keypad at a glance
The operation for each key is shown in Table 1- 2. Pressing a key changes the
current key operation, illuminates the related symbol on the display and emits
a beep.
Figure 1-7 Keypad
Table 1-2 Keypad functions
Key
Description
System related operation
Press to power-on or power-off the U3402A multimeter.
Press to select Shift.
Press to return the multimeter to front panel operation when it is in remote
state.
+
Press to step through the Setup menu. See “Using the Setup Menu” on
page 45 for more information.
Press to enable the secondary display.
+
U3402A User’s and Service Guide
Press to disable the secondary display.
11
1
Getting Started Tutorial
Table 1-2 Keypad functions
Key
Description
Measurement related operation
Press to select the DC voltage measurement.
Press to select the AC voltage measurement.
Press to select the DC current measurement.
Press to select the AC current measurement.
+
Press to select the AC+DC voltage measurement.
+
Press to select the AC+DC current measurement.
Press to toggle between the 2-wire resistance or 4-wire resistance
measurement.
Press to select the frequency measurement.
Press to toggle between the diode and continuity measurement.
+
Press to select dBm measurement.
Press to toggle between manual ranging and autoranging.
Press to select a higher range and disable autoranging. See “Selecting a
Range” on page 30 for more information.
Press to select a lower range and disable autoranging. See “Selecting a
Range” on page 30 for more information.
12
U3402A User’s and Service Guide
Getting Started Tutorial
1
Table 1-2 Keypad functions
Key
Description
+
+
+
Press to select compare math operation.
Press to select and set the high limit for compare math operation.
Press to select and set the low limit for compare math operation.
Press to enable Hold math operation. See “Hold” on page 40 for more
information.
+
Press to select the reference impedance for dBm measurement.
Press to enable the MinMax math operation.
+
Press to select the reading rate. See “Setting the Reading Rate” on
page 32 for more information.
Press to select the relative math operation.
+
U3402A User’s and Service Guide
Press to toggle in and out of the relative base (Rel#). See “Rel” on page 36
for more information.
13
1
Getting Started Tutorial
The terminals at a glance
CAUTION
To avoid damaging this multimeter, do not exceed the rated input limit.
Figure 1-8 Input terminal
NOTE
14
Voltages above 300 VAC may be measured only in circuits that are isolated from mains.
However, transient overvoltages are also present on circuits that are isolated from mains.
The Keysight U3402A is designed to safely withstand occasional transient overvoltages up
to 2500 V PEAK. Do not use this multimeter to measure circuits where transient
overvoltages could exceed this level.
U3402A User’s and Service Guide
Getting Started Tutorial
1
Table 1-3 Input terminal for different measurement functions
Measurement function
Input terminal
Overload protection
DC voltage (VDC)
AC voltage (VAC), frequency (Hz)
Miliampere (mA), frequency (Hz)
1000 VDC
750 VAC RMS, 1100 V PEAK,
2x107 V-Hz normal mode, or
1x106 V-Hz common mode
V W Hz (Hi)
mA
1200 mADC or AC RMS
Lo
12A, frequency (Hz)
2-wire resistance (W (2W))
Diode test, continuity test
4-wire resistance (W (4W))
All functions
U3402A User’s and Service Guide
12A
12 ADC or AC RMS for
continuous 30 seconds, or
10 ADC or AC RMS
V W Hz
500 VDC or AC RMS
Hi
250 VDC or AC RMS
Any terminal to earth
1000 VDC or AC PEAK
15
1
Getting Started Tutorial
The rear panel at a glance
AC line
voltage selector
AC power
connector
AC line fuse
Line voltage fuse
selection table
Chassis
ground lug
RS232 interface connector
(For calibration use only)
Figure 1-9 Rear panel
16
U3402A User’s and Service Guide
Getting Started Tutorial
1
Making Measurements
The following pages show you how to make measurement connections and how
to select measurement functions from the front panel for each of the
measurement functions.
NOTE
• After measuring a high voltage measurement of up to 1000 VDC, you are recommended
to wait for approximate two minutes before measuring a low-level measurement with
1 to 10 µV resolutions.
• After measuring a high current measurement using the A input terminal, you are
recommended to wait for approximate ten minutes before measuring a low-level DC
measurements of volts, amperes, or ohms; to achieve accurate measurement. This is
due to the thermal voltages generated during the high current measurements that may
cause errors when measuring the low-level measurements.
U3402A User’s and Service Guide
17
1
Getting Started Tutorial
Performing voltage measurements
WA R N I N G
Exceeding the crest factor limit may result in an incorrect or a lower reading. Do not
exceed the crest factor limit to avoid instrument damage and the risk of electric
shock.
CAUTION
Ensure that the terminal connections are connected correctly before making any
measurement. To avoid damaging the multimeter, do not exceed the rated input limit.
AC voltage:
• Five ranges:
• Slow reading rate: 120.000 mV, 1.20000 V, 12.0000 V, 120.000 V, 750.00 V.
• Medium reading rate: 400.00 mV, 4.0000 V, 40.000 V,400.00 V, 750.0 V.
• Fast reading rate: 400.0 mV, 4.000 V, 40.00 V, 400.0 V, 750 V.
• Measurement method: AC coupled true RMS—measures the AC component with up to 400 VDC
bias on any range
• Crest factor: Maximum 3:0 at full scale
• Input impedance: 1 MW ± 2% in parallel with < 120 pF on all ranges
• Input protection: 750 V RMS on all ranges
1 Press
.
2 Connect the red and black test leads to the respective input terminals as
shown in Figure 1- 10.
3 Probe the test points and read the display. In auto- ranging mode, the
multimeter automatically selects the appropriate range and the
measurement is displayed.
+
ACV voltage
source
–
Figure 1-10 ACV terminal connection and display
18
U3402A User’s and Service Guide
Getting Started Tutorial
1
DC voltage:
• Five ranges:
• Slow reading rate: 120.000 mV, 1.20000 V, 12.0000 V, 120.000 V, 1000.00 V.
• Medium reading rate: 400.00 mV, 4.0000 V, 40.000 V, 400.00 V, 1000.0 V.
• Fast reading rate: 400.0 mV, 4.000 V, 40.00 V, 400.0 V, 1000 V.
• Measurement method: Sigma Delta A-to-D converter
• Input impedance: 10 MW ± 2% range (typical)
• Input protection: 1000 V on all ranges
1 Press
.
2 Connect the red and black test leads to the respective input terminals as
shown in Figure 1- 11.
3 Probe the test points and read the display. In autoranging mode, the
multimeter automatically selects the appropriate range and the
measurement is displayed.
+
DCV voltage
source
–
Figure 1-11 DCV terminal connection and display
U3402A User’s and Service Guide
19
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Getting Started Tutorial
Performing current measurements
Measuring AC (RMS) or DC Current in mA
• Three AC current or DC current ranges:
• Slow reading rate: 12.0000 mA, 120.000 mA, 1.20000 A
• Medium reading rate: 40.000 mA, 120.00 mA, 1.2000 A
• Fast reading rate: 40.00 mA, 120.0 mA, 1.200 A
• Shunt resistance: 0.1 W to 10 W for 12 mA to 1.2 A range
• Input protection: Front panel 1.25 A, 500 V FH fuse for one terminal
1 Press
or
.
2 Power off the measured circuit.
3 Connect the red and black test leads to mA input terminal as shown in
Figure 1- 12.
4 Probe the test points in series with the circuit
5 Power on the measured circuit and read the display.
+
ACI or DCI
current source
–
Figure 1-12 ACI RMS or DCI (mA) terminal connection and display
20
U3402A User’s and Service Guide
Getting Started Tutorial
1
Measuring AC (RMS) or DC Current up to 12 A
• One range:
• 12.0000A for DC or AC RMS continuous
• 12.0000 ADC or AC RMS for maximum 30 seconds
• Shunt resistance: 0.01 W for 12 A range
• Input protection: Internal 15 A, 600 V fuse for 12A terminal
1 Press
or
.
2 Power off the measured circuit.
3 Connect the red and black test leads to the A input terminal as shown in
Figure 1- 13.
4 Probe the test points in series with the circuit.
5 Power on the measured circuit and read the display.
NOTE
Autoranging is not applicable for current measurement up to 12 A. You are required to
select the range manually when a signal is applied to the A terminal.
–
ACI or DCI
current source
+
Figure 1-13 ACI RMS or DCI (A) terminal connection and display
U3402A User’s and Service Guide
21
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Getting Started Tutorial
Performing frequency measurements
WA R N I N G
Use the frequency counter for low voltage applications. Do not use the frequency
counter on AC power line systems.
Measuring frequency
• Five ranges: 120.000 mV, 1.20000 V, 12.0000 V, 120.000 V, 750.00 V — range is based on the voltage
level of the signal, not frequency
• Measurement method: Reciprocal counting technique
• Signal level: 10% of range to full scale input on all ranges
• Gate time: 0.1 s or 1 period of the input signal, whichever is longer
• Input protection: 750 V RMS on all ranges
1 Press
.
2 Connect the red and black test leads to the input terminal as shown in
Figure 1- 14.
3 Probe the test points and read the display. In auto- ranging mode, the
multimeter automatically selects the appropriate range and the
measurement is displayed.
+
Frequency
source
–
Figure 1-14 Frequency terminal connection and display
22
U3402A User’s and Service Guide
Getting Started Tutorial
1
Performing resistance measurements
CAUTION
Disconnect circuit power and discharge all high-voltage capacitors before measuring
resistance to avoid damaging the multimeter or the device under test.
Measuring resistance
• Seven ranges:
• Slow reading rate: 120 .000 W, 1.20000 kW, 12.0000 kW, 120.000 kW, 1.20000 MW, 12.0000 MW,
120.000 MW
• Medium reading rate: 400 .00 W, 4.0000 kW, 40.000 kW, 400.00 kW, 4.0000 MW, 40.000 MW,
300.00 MW
• Fast reading rate: 400 .0 W, 4.000 kW, 40.00 kW, 400.0 kW, 4.000 MW, 40.00 MW, 300.0 MW
• Measurement method: 2-wire ohms or 4-wire ohms, open circuit voltage limited to < +9 V
• Input protection: 500 V on all ranges
1 Press
. The default function is 2- wire W measurement.
2 Connect the red and black test leads to the input terminal as shown in
Figure 1- 15 or Figure 1- 16 on page 24 respectively (according to the
selected measurement method).
3 Probe the test points (by shunting the resistor) and read the display. In
auto- ranging mode, the multimeter automatically selects the appropriate
range and the measurement is displayed.
U3402A User’s and Service Guide
23
1
Getting Started Tutorial
Test current
+
Resistance
–
Figure 1-15 2-wire W terminal connection and display
Test current
+
Resistance
–
Figure 1-16 4-wire W terminal connection and display
24
U3402A User’s and Service Guide
Getting Started Tutorial
1
Performing diode/continuity test
Testing diodes
The diode test measures the forward voltage of a semiconductor junction of
approximately 0.5 mA. The beeper will emit a single beep tone when the input
voltage is below +0.7 V (approximately 1.4 kW) and emits a continuous beep
tone when the input voltage is below 50 mV (approximately 100 W).
Measurements are displayed as shown below:
NOTE
Reading rate
Measurement display
Slow
Medium
1.2 V range
2.5 V range
Fast
4.0 V range
The measurement value will display OL (overload) when the voltage measured is
• > 1.2 V at slow reading rate
• > 2.5 V at medium reading rate
• > 4.0 V at fast reading rate
CAUTION
Disconnect circuit power and discharge all high-voltage capacitors before testing
diodes to avoid damaging the multimeter.
• Measurement method: 0.5 mA ± 0.2% constant current source, open-circuit voltage
limited to < +9 V
• Response time: 70 samples per seconds with audible tone
• Gate time: 0.1 s or 1 period of the input signal, whichever is longer
• Input protection: 500 V RMS on all ranges
U3402A User’s and Service Guide
25
1
Getting Started Tutorial
To test a diode, switch the circuit power off, and remove the diode from the
circuit. Then proceed as follows:
1 Press
. The default function is diode measurement.
2 Connect the red and black test leads to the input terminal as shown in
Figure 1- 17.
3 Connect the red test lead to the positive terminal (anode) of the diode and
the black test lead to the negative terminal (cathode). Refer to Figure 1- 17.
NOTE
The cathode of a diode is indicated with a band.
4 Read the display.
5 Reverse the probes and measure the voltage across the diode again as shown
in Figure 1- 18. Assess the diode according to the following guidelines:
• A diode is considered good if the multimeter displays OL in reverse bias
mode.
• A diode is considered shorted if the multimeter displays approximately
0 V in both forward and reverse bias modes, and the multimeter beeps
continuously.
• A diode is considered open if the multimeter displays OL in both
forward and reverse bias modes.
26
U3402A User’s and Service Guide
Getting Started Tutorial
1
Test current
+
Forward
bias
–
Figure 1-17 Forward-biased diode/continuity test terminal connection and display
Test current
Reverse
bias
+
–
Figure 1-18 Reverse-biased diode/continuity terminal connection and display
U3402A User’s and Service Guide
27
1
Getting Started Tutorial
Testing Continuity
The continuity test measures the resistance of a tested circuit with 2- wire
method at approximately 0.5 mA and determines whether the circuit is intact.
The beeper emits a continuous beep tone when the input resistance value is
less than the approximate 10 W.
Measurement are displayed as shown below:
CAUTION
Reading rate
Measurement display
Slow
120.000 W range
Medium
400.00 W range
Fast
400.0 W range
Disconnect circuit power and discharge all high-voltage capacitors before testing the
circuit continuity to avoid damaging the multimeter or the device under test.
• Measurement method: 0.5 mA ± 0.2% constant current source, open circuit voltage
limited to < +9 V
• Continuity threshold: 10 W fixed
• Input protection: 500 V RMS on all ranges
1 Press
to toggle to the continuity measurement function.
2 Connect the red and black test leads to the input terminal as shown in
Figure 1- 19.
3 Probe the test points and read the display.
28
U3402A User’s and Service Guide
Getting Started Tutorial
1
Test current
+
Resistance
–
Figure 1-19 2-wire/continuity test terminal connection and display
U3402A User’s and Service Guide
29
1
Getting Started Tutorial
Selecting a Range
You can allow the multimeter to select the range automatically by using
autoranging, or you can select a fixed range using manual ranging.
Auto- ranging is convenient because the multimeter automatically selects the
appropriate range for sensing and displaying each measurement. However,
manual ranging results in better performance, since the multimeter does not
have to determine which range to use for each measurement.
Selects autoranging and disables manual ranging. Press to
toggle between the manual ranging and autoranging.
Selects a higher range and disable autoranging.
Selects a lower range and disable autoranging.
For dual display, the measurement range for primary and secondary display as
stated below is similar and is unable to be changed independently.
•
•
•
•
•
•
DCV/DCV
DCV/ACV
ACV/DCV
ACV/ACV
ACV+DCV/DCV
ACV+DCV/ACV
•
•
•
•
•
•
DCI/DCI
DCI/ACI
ACI/DCI
ACI/ACI
ACI+DCI/DCI
ACI+DCI/ACI
• Autoranging is selected at default factory power- on.
• Manual ranging — If the input signal is greater than can be measured on the
selected range, the multimeter will display an overload indication, OL on the
primary or secondary display front panel.
• The multimeter remembers the selected ranging method (auto or manual)
and the selected manual range for each measurement function.
30
U3402A User’s and Service Guide
Getting Started Tutorial
1
• Autorange thresholds — The multimeter shifts ranges as follows:
• Down range at < 5% of current range
• Up range at > full scale of current range
• Table 1- 4 shows the summary of range values for slow, medium, and fast
reading rate respectively.
NOTE
Autoranging is not applicable for current measurement up to 12 A. You are required to
select the range manually when a signal is applied to the A terminal.
Table 1-4 Range scale value in slow, medium, and fast reading rate
Measurement
function
DCV
ACV, DCV + ACV
DCI, ACI, DCI + ACI
DCI, ACI, DCI + ACI
Frequency
Resistance [2]
Diode test
Continuity
Slow reading rate
Range
Medium reading rate
Fast reading rate
120.000 mV, 1.20000 V,
12.0000 V, 120.000 V,
1000.00 V
120.000 mV, 1.20000 V,
12.0000 V, 120.000 V,
750.00 V
12.0000 mA, 120.000 mA,
1200.00 mA
400.00 mV, 4.0000 V,
40.000 V, 400.00 V,
1000.0 V
400.00 mV, 4.0000 V,
40.000 V, 400.00 V,
750.0 V
40.000 mA, 120.00 mA,
1200.0 mA
40.00 mA, 120.0 mA,
1200 mA
12.0000 A [1]
1200.00 Hz, 12.0000 kHz,
120.000 kHz, 1.00000 MHz
120.000 W, 1.20000 kW,
12.0000 kW, 120.000 kW,
1.20000 MW, 12.0000 MW,
120.000 MW
12.000 A [1]
1200.0 Hz, 12.000 kHz,
120.00 kHz, 1.0000 MHz
400.00 W, 4.0000 kW,
40.000 kW, 400.00 kW,
4.0000 MW, 40.000 MW,
300.00 MW,
12.00 A [1]
1200 Hz, 12.00 kHz,
120.0 kHz, 1.000 MHz
400.0 W, 4.000 kW,
40.00 kW, 400.0 kW,
4.000 MW, 40.00 MW,
300.0 MW,
1.20000 V
2-wire W/120 W
(continuity mode)
2.5000 V
2-wire W/400 W
(continuity mode)
2.500 V
2-wire W/400 W
(continuity mode)
Autoranging
400.0 mV, 4.000 V,
40.00 V, 400.0 V, 1000 V
400.0 mV, 4.000 V,
40.00 V, 400.0 V, 750 V
Manual only
Fixed range
Notes:
1 10 A continuous DC or AC RMS; 12 A DC or AC RMS for 30 seconds maximum.
2 A shielded test cable is recommended when measuring resistance more than 120 kW to eliminate noise interference that
might be induced to the test leads.
U3402A User’s and Service Guide
31
1
Getting Started Tutorial
Setting the Reading Rate
You can select three reading rates for the AC and DC voltage, AC and DC
current, and resistance measurement which are Slow (S), Medium (M), and
Fast (F)
The selected rate allows you to maximize either the measurement speed or
noise rejection, which affects the measurement accuracy. Refer to Table 1- 5.
Table 1-5 Reading rates for single function measurements
Reading rate
Resolution
Display counts [1][2]
Slow
5½
119,999
Medium
4½
39,999
Fast
3½
3,999
Notes:
1 In VDC 1000 V range, the display counts is limited up to 1200.00, 1200.0 and 1200 for slow,
medium, and fast reading rate respectively.
2 In VAC 750 V range, 1000 V RMS is measureable.
The annunciator S, M, and F (slow, medium and fast respectively) are located
at the corner left of the display indicates the selected rate on the primary
display. Refer to Figure 1- 20.
Figure 1-20 Reading rate annunciator
Press
NOTE
32
to cycle through the available reading rates (S, M, or F).
In the dBm function, the display counts is 0.01 dBm for slow or medium reading rate and
0.1 dBm for fast reading rate.
U3402A User’s and Service Guide
U3402A 5 1/2 Digit Dual Display Multimeter
User’s and Service Guide
2
Operations and Features
Operating Math Operations 34
dBm 35
Rel 36
MinMax 37
Comp 39
Hold 40
Combination of Math Operations 41
Using the Secondary Display 43
Using the Setup Menu 45
Changing the Configurable Settings 46
This chapter explains the various functions and features
available to the U3402A digital multimeter
2
Operations and Features
Operating Math Operations
Table 2- 1 presents a summary of the math operations that can be used with
each measurement function.
Table 2-1 Math operations for different measurement functions
Measurement functions
Allowed math operations
dBm
Rel
Min
Max
Comp
Hold
DCV
DCI
Resistance
—
—
ACV
ACI
Frequency
Diode/Continuity
—
—
—
• All math operations can be toggled on and off by reselecting the same math
operation.
• Only one math operation can be turned- on at a time. When selecting
another math operation when one is already on, you are required to
turn- off the first operation and then turn- on the second math operation.
• All math operations are automatically turned- off when changing the
measurement functions.
• Range changing is allowed for all math operations.
34
U3402A User’s and Service Guide
Operations and Features
2
dBm
The logarithmic dBm (decibels relative to one milliwatt) scale is often used in
RF signal measurements. The multimeter’s dBm operation takes a
measurement and calculates the power delivered to a reference impedance
(typically 50, 75, or 600 W). The formula used for conversion from the voltage
reading is:
dBm = 10 x Log10 [ 1000 x (Reading2 / reference impedance)]
Figure 2-1 Typical dBm operation display
The default reference impedance value is 600 W. You can select the following 21
reference impedance values:
2 W, 4 W, 8 W, 16 W, 50 W, 75 W, 93 W, 110 W, 124 W, 125 W, 135 W, 150 W, 250 W,
300 W, 500 W, 600 W, 800 W, 900 W, 1000 W, 1200 W, or 8000 W..
If reference impedance 2 W, 4 W, 8 W, or 16 W is selected, the dBm operation is
displayed in watt (power).
Numeric results are in the range of ±120.000 dBm with 0.01 dBm resolution
shown, independent of the number of digits setting.
The dBm operation can be applied to DCV and ACV measurement functions
only. The multimeter displays the dBm operation on the primary display and
displays the reference impedance selection on the secondary display.
Procedure 1
1 Press
2 Use
3 Press
U3402A User’s and Service Guide
to enter dBm operation.
and
to select the desired reference impedance.
to store the selected value and read the display.
35
2
Operations and Features
Procedure 2
1 Press
. The reference impedance currently used will be displayed
on the secondary display.
2 Use
3 Press
4 Press
and
to select the desired reference impedance.
to store the selected value.
to enable the dBm operation and read the display.
Rel
When making Rel (relative) measurements, each reading is the difference
between a stored relative value and the input signal. For example, this feature
can be used to make more accurate resistance measurements by nulling the
test lead resistance.
After you enable the Rel operation, the multimeter stores the next reading as a
Rel # (relative base) and immediately displays on the primary display:
Primary Display = Reading – Rel #
Figure 2-2 Typical Rel operation display
The multimeter allows relative settings for the following measurement
functions: DC voltage, AC voltage, DC current, AC current, resistance, and
frequency.
36
U3402A User’s and Service Guide
Operations and Features
2
Procedure
1 Press
to enable Rel operation.
2 Press
3 Use
NOTE
to toggle in (and out) the Rel #.
,
,
, and
to modify the Rel #.
4 Press
to set the Rel # and read the display.
5 Press
to disable the Rel operation.
• In resistance measurement mode, the multimeter will read a non-zero value even when
the two test leads are in direct contact, because of the resistance of these leads. Use
the Rel operation to zero-adjust the display.
• In DC voltage measurement mode, the thermal effect will influence the accuracy. Short
the test leads and press
the display.
once the displayed value is stable to zero-adjust
MinMax
The MinMax (Minimum/Maximum) operation stores the minimum and
maximum values of reading during a series of measurements.
When enabled, the MinMax operation turns on the MINMAX annunciator and
begins accumulating various statistics of the readings being displayed.
Figure 2-3 Typical Max operation display
U3402A User’s and Service Guide
37
2
Operations and Features
Figure 2-4 Typical Min operation display
Each time a new minimum or maximum value is stored, the multimeter beeps
once (if the beeper is enabled) and briefly turns on the appropriate MAX or
MIN annunciator.
Accumulated statistics are:
• MAX—maximum reading since MinMax was enabled
• MIN—minimum reading since MinMax was enabled
• MINMAX—actual readings
NOTE
When MinMax is enabled, the measurement range changed to manual ranging and the
current measurement mode is locked until MinMax is disabled (with other ranges being
selected or autoranging is enabled).
Procedure
1 Press
to enable MinMax operation.
2 Press
to cycle through the available MINMAX operations (MIN, MAX,
or MINMAX).
3 Press
38
to disable the MinMax operation.
U3402A User’s and Service Guide
Operations and Features
2
Comp
The Comp (compare) operation allows you to perform pass/fail testing against
specified upper and lower limits. You can set the upper and lower limits to any
value between 0 and \100% of the highest range for the present function.
Figure 2-5 Typical Comp operation display
When enabled, the actual readings are shown in primary display and the
comparison results such as HI, LO, or PASS is shown in secondary display.
• You should specify the upper limit to always be a more positive number
than the lower limit. The initial factory setting for LO limit is 0.
• The secondary display shows PASS when readings are within the specified
limits. The secondary display shows HI when the reading is outside the high
limit and LO when the reading is outside the low limit.
• When the beeper is ON (see “Using the Setup Menu” on page 45), the beeper
beeps on the transition from PASS to HI or PASS to LO or when transitioning
directly from HI to LO or LO to HI (no PASS in between).
• Press
to enable Comp operation.
Procedure
1 Press
to enter the upper limit setup mode.
The upper limit is shown on primary display while the HI annunciator is
shown on secondary display.
2 Use
U3402A User’s and Service Guide
,
,
, and
to modify the upper limit.
39
2
Operations and Features
3 Press
to store the specified value.
4 Press
to enter the lower limit setup mode.
The lower limit is shown on primary display while the LO annunciator is
shown on secondary display.
5 Use
6 Press
,
,
, and
to modify the lower limit.
to store the specified value.
7 Press
to enable the Comp operation.
8 Press
to disable the Comp operation or exit.
Hold
The reading hold feature allows you to capture and hold a reading on the front
panel display. When enabled, the Hold operation turns on the Hold
annunciator and hold the reading.
Procedure
1 Press
to hold the reading on the display.
Figure 2-6 Typical Hold operation display
40
U3402A User’s and Service Guide
Operations and Features
2
Combination of Math Operations
NOTE
The math operation can be operated for primary display only.
The Keysight U3402A multimeter allows you to use multiple math operation
such as dBm, MinMax, Rel, Hold, and Comp simultaneously.
Example:
Set upper and lower limit for Comp operation using multiple math operation
as below:
1 Press
to enable dBm operation.
2 Press
to take dBm readings as Rel # for new measurement.
3 Press
to record the Max value as the new Rel # (upper limit).
4 Press
to record the Min value as the new Rel # (lower limit).
5 Press
to enable the Comp operation.
The step- by- step sequence and readings of the combined math operations are
shown in Table 2- 2 on page 42 when all math operations are used
sequentially. Refer to Figure 2- 7.
U3402A User’s and Service Guide
41
2
Operations and Features
Table 2-2 Descriptions for combined math operations
No.
Math operation
sequence
Description
Readings
1
dBm
Reading is calculated to a dBm operation
“A”
2
Rel
dBm reading, “A” is taken as Rel #
“B”
3
Min
Min reading of relative dB is recorded as a
new Rel #, “B”
“C”
4
Max
Max reading of relative dB is recorded as a
new Rel #, “B”
“D”
5
Comp
Compare operation is performed based on the
readings of “C” and “D”
“E”
1. Press
2. Press
3. Press
4. Press
5. Press
Figure 2-7 Combined math operations sequence
42
U3402A User’s and Service Guide
Operations and Features
2
Using the Secondary Display
To enable the secondary display mode:
1 Press
followed by a specified function keys such as
,
, or
,
,
to enable the secondary display mode.
The 2ND annunciator is displayed along with the secondary display.
Secondary
display
2ND
annunciator
Figure 2-8 Secondary display
To disable the secondary display mode:
1 Press
.
Table 2- 3 details the available input combinations for both primary and
secondary display when dual display mode is selected.
U3402A User’s and Service Guide
43
2
Operations and Features
Table 2-3 Description for dual display combination
Primary display
Secondary display
DCV
DCV
ACV
DCI [4]
DCI [4]
ACV
[1]
[1]
[1]
[1]
ACI [4]
ACV + DCV
[1]
Frequency [7]
Diode/Continuity
Hz [7]
[1]
[1]
[2]
[1]
[1]
[2]
[1]
[1]
[2]
[2]
[2]
[1]
ACI + DCI [4]
Resistance [3]
ACI [4]
[5]
[5]
[5]
[5]
[5]
[5]
dBm [6]
Notes:
1 The range for both primary and secondary display are corresponding to the higher range of two
displays (autoranging mode, while the range of secondary display are the same as the primary
displays (manual range mode).
2 The frequency measurement corresponding to the current input signals; other measurements
are corresponding to the voltage input signals.
3 In dual display mode, users are recommended to measure the resistance up to 1 MW.
4 At 12 A range, manual range mode is selected by default.
5 Measurable with non-guaranteed accuracy.
6 Autoranging mode by default.
7 The voltage or current range of the frequency function follows the voltage or current range of the
other function.
NOTE
In dual display mode, the
44
The multimeter has an increased key response time (0.6 s to 1 s) when in dual display
mode. You may need to press the selected key until the multimeter responses.
U3402A User’s and Service Guide
Operations and Features
2
Using the Setup Menu
The Setup menu allows you to customize a number of non- volatile instrument
configurations. The content of the Setup menu are shown in Table 2- 4.
Table 2-4 Setup menu and communication parameters
First tier
menu
rS232 [1]
Description
RS232 interface parameters
Second
tier menu
Description
Default
factory
setting
Available settings
bAUd
Baud rate for remote
communication with a
PC (remote control).
9600
300, 600, 1200, 2400,
4800 or 9600
PArtY
Parity bit for remote
communication with a
PC.
None
None, odd, or even
dAtA
Data bit length for
remote communication
with a PC.
8
7 or 8
StoP
Stop bit.
1
1 or 2
Echo
ECHO. Return a
character to PC in
remote communication.
OFF
ON or OFF
Print
Printer-Only. Print
measured data to a PC in
remote communication.
OFF
ON or OFF
Beeper selection
ON
ON or OFF
bEEP [2]
Notes:
1 For calibration use only.
2 The beeper is use to simplify the multimeter operation. It is not a communication related parameter.
U3402A User’s and Service Guide
45
2
Operations and Features
Changing the Configurable Settings
The parameters in the Setup menu can be configured by using the following
procedures:
1 Press
to access to the Setup menu.
2 Use
and
tier menu.
to select the desired configurable items in the first
If you select bEEP,
a Use
and
b Press
to confirm the selected parameter.
c Press
to quit from the Setup menu.
to select the desired parameter.
d The configuration settings is saved and main display is displayed.
If you select rS232,
a Press
b Use
to enter the second tier menu.
and
to select the desired configurable items.
c Use
and
d Press
to confirm the selected parameter.
e Press
to quit from the tier menu or quit from the Setup menu.
to select the desired parameters.
f The configuration settings is saved and main display is displayed.
46
U3402A User’s and Service Guide
U3402A 5 1/2 Digit Dual Display Multimeter
User’s and Service Guide
3
Application Tutorial
Applications for Using Dual Display 52
Dual Display Operation Examples 53
Measure DC Voltage and AC Ripple on a Rectification Circuit 53
Measure AC and DC Current on a Rectification Circuit 54
Measure AC Voltage and Frequency on an AC Circuit 55
Measure DC Voltage and DC Current on a Transistor Circuit or Load 56
Measure Resistance Using 2-Wire Mode 58
Measure Resistance Using 4-Wire Mode 59
Measure True RMS AC+DC 60
This chapter describes the advanced features and the possible
applications for effective operation of the multimeter.
3
Application Tutorial
Applications for Using Dual Display
The dual display feature in the multimeter can be used to enhance test and
measurement capabilities. See Table 3- 1 for the available combinations and
application when using dual display.
Table 3-1 Typical combinations and applications when using dual display
52
No.
Primary display
Secondary display
1
DCV
ACV
2
ACV + DCV
DCV
3
DCV
DCI
4
DCV
ACI
5
ACI + DCI
DCV
6
ACV
DCI
Applications
• Test DC to AC or AC to DC converter circuit.
• Measure DC level and AC ripple of power
supply.
• Test power supply load regulation.
• Check loop current and voltage drop level.
• Test line and load regulation.
• Test AC to DC or DC to AC converters.
• Measure DC level and AC ripple of power
supply.
• Test transformer.
7
ACI + DCI
ACV
8
ACV
ACI
9
ACV
Frequency
10
ACI
Frequency
11
DCI
ACI
12
ACI + DCI
DCI
13
dBm
Reference W
• Measure AC frequency response of amplifier
circuit.
• Adjust AC motor control.
• Measure AC ripple and DC current of power
supply.
• Measure current dissipation for power supply
analysis.
• Set dB reference impedance and show dBm.
14
dBm
DCV
• Indicate DC voltage and dBm.
15
dBm
ACV
• Indicate AC voltage and dBm.
16
dBm
Frequency
• Check frequency response.
U3402A User’s and Service Guide
Application Tutorial
3
Dual Display Operation Examples
This section describes some practical operations when using dual display
feature.
Measure DC Voltage and AC Ripple on a Rectification Circuit
A single measurement for both DC voltage and AC ripple can be displayed
through both display while testing a rectifier circuit.
1 Connect the red and black test leads to the input terminal and probe the test
points as shown in Figure 3- 1.
AC/DC
voltage
source
+
–
Figure 3-1 Terminal connection when measuring DC voltage and AC ripple on a
rectification circuit
2 Press
3 Press
4 Press
U3402A User’s and Service Guide
to select DC voltage measurement for primary display.
to enable the secondary display. The 2ND is displayed.
to select AC voltage measurement for secondary display.
53
3
Application Tutorial
5 Press
. Use
and
to select autoranging or manual ranging for
the primary and secondary display. The ranging will be the same for both
displays.
• Press
NOTE
to disable the secondary display.
• Press
to select the suitable range if DCV+ACV ripple is above the scale of the
current range.
Measure AC and DC Current on a Rectification Circuit
A single measurement for both AC current and DC current can be displayed
through both display while testing a rectifier circuit.
WA R N I N G
• Make sure you select the correct input terminal according to the input range
used.
• Do not apply more than 12 A to the A input terminal to avoid the multimeter from
damage.
1 Connect the red and black test leads to the input terminal and probe the test
points as shown in Figure 3- 2.
AC/DC
current
source
–
+
Figure 3-2 Terminal connection when measuring AC and DC current on a rectification
circuit
54
U3402A User’s and Service Guide
Application Tutorial
2 Press
to select AC current measurement for primary display.
3 Press
. Use
secondary display.
4 Press
5 Press
NOTE
Press
3
and
to select autoranging or manual ranging for
to enable the secondary display. The 2ND is displayed.
to select DC current measurement for secondary display.
to disable the secondary display.
Measure AC Voltage and Frequency on an AC Circuit
A single measurement for both AC voltage and frequency can be displayed
through both display while testing a rectifier circuit.
1 Connect the red and black test leads to the input terminal and probe the test
points as shown in Figure 3- 3.
AC
voltage
source
+
–
Figure 3-3 Terminal connection when measuring AC voltage and frequency on an
AC circuit
2 Press
U3402A User’s and Service Guide
to select AC voltage measurement for primary display.
55
3
Application Tutorial
3 Press
. Use
primary display.
4 Press
5 Press
Press
to select autoranging or manual ranging for
to enable the secondary display. The 2ND is displayed.
to select frequency measurement for secondary display.
6 Press
. Use
secondary display.
NOTE
and
and
to select autoranging or manual ranging for
to disable the secondary display.
Measure DC Voltage and DC Current on a Transistor Circuit or
Load
A single measurement for both DC voltage and current can be displayed
through both display while testing a transistor amplifier circuit. You may also
check the Hfe or calculate the DC load consumption by using the dual display.
WA R N I N G
• Make sure you select the correct input terminal according to the input range
used.
• Do not apply more than 12 A to the A input terminal to avoid the multimeter from
damage.
56
U3402A User’s and Service Guide
Application Tutorial
3
1 Connect the red and black test leads to the input terminal and probe the test
points as shown in Figure 3- 4.
+
DC
voltage
source
Load
–
Figure 3-4 Terminal connection when measuring DC voltage and DC current on a
transistor circuit or load
2 Press
to select DC voltage measurement for primary display.
3 Press
. Use
primary display.
4 Press
5 Press
Press
U3402A User’s and Service Guide
to select autoranging or manual ranging for
to enable the secondary display. The 2ND is displayed.
to select DC current measurement for secondary display.
6 Press
. Use
secondary display.
NOTE
and
and
to select autoranging or manual ranging for
to disable the secondary display.
57
3
Application Tutorial
Measure Resistance Using 2-Wire Mode
WA R N I N G
Do not apply voltage exceeding 500 V PEAK between V.W.Hz and Lo input terminals.
1 Connect the red and black test leads to the resistor and probe the test points
as shown in Figure 3- 5.
+
Resistance
–
Figure 3-5 Terminal connection when measuring resistance using 2-wire mode
2 Press
to select the 2- wire W measurement for primary display. The
2W is displayed.
3 Press
. Use
primary display.
NOTE
58
and
to select autoranging or manual ranging for
When measuring low resistance, you may use the Rel operation to reduce the
measurement error created by the test leads resistance and contact resistance in the test
loop (0.1 W~ 0.5 W typical)
U3402A User’s and Service Guide
Application Tutorial
3
Measure Resistance Using 4-Wire Mode
WA R N I N G
Do not apply voltage exceeding 250 V PEAK between Sense Hi and Sense Lo
terminals, and 500 V PEAK between V.W.Hz and Lo input terminals.
1 Connect the red and black test leads to the resistor and probe the test points
as shown in Figure 3- 6.
+
Resistance
–
Figure 3-6 Terminal connection when measuring resistance using 4-wire mode
2 Press
to select the 4- wire W measurement for primary display. The
4W is displayed.
3 Press
. Use
primary display.
U3402A User’s and Service Guide
and
to select autoranging or manual ranging for
59
3
Application Tutorial
Measure True RMS AC+DC
The multimeter can measure the true RMS value of the AC voltage and AC
current.
1 Press
and
, or
and
simultaneously. The
multimeter will measure the DC and AC signals alternatively, calculate and
display the AC+DC (RMS) value using the equation below:
AC+DC (RMS) =
NOTE
60
DC2 + AC2
When AC+DC voltage measurement is selected, the DCV input impedance is paralleled
with the AC coupled 1.1 MW AC divider.
U3402A User’s and Service Guide
U3402A 5 1/2 Digit Dual Display Multimeter
User’s and Service Guide
4
Performance Test
Calibration Overview 62
Keysight Technologies Calibration Services 62
Calibration Interval 62
Recommended Test Equipment 63
Test Considerations 64
Performance Verification Test Overview 65
Performance Verification Test 65
DC Voltage Verification Test 65
DC Current Verification Test 67
Resistance Verification Test 68
Diode Verification Test 71
Frequency Verification Test 71
AC Voltage Verification Test 72
AC Current Verification Test 73
This chapter contains performance test procedures. The
performance test procedures allow you to verify that the
multimeter is operating within its published specifications.
WA R N I N G
Shock hazard. Only service-trained personnel who are aware of the hazards
involved should perform the procedures in this chapter. To avoid electrical shock and
personal injury, make sure to read and follow all test equipment safety instructions.
Use only completely electrically insulated test lead sets with connectors that
prevent contact with test voltages.
4
Performance Test
Calibration Overview
NOTE
Make sure you have read “Test Considerations” on page 64 before
calibrating the multimeter.
Keysight Technologies Calibration Services
When your instrument is due for calibration, contact your local Keysight
Service Center. The U3402A is supported on automated calibration systems at
Keysight service centres only.
Calibration Interval
A one- year interval is adequate for most applications. Accuracy specifications
are warranted only if adjustment is made at regular calibration intervals.
Accuracy specifications are not warranted beyond the one- year calibration
interval. Keysight does not recommend extending calibration intervals beyond
two years for any application. When an adjustment is required, contact your
local Keysight Service Center.
62
U3402A User’s and Service Guide
Performance Test
4
Recommended Test Equipment
The test equipments recommended for the performance verification
procedures are listed below. If the exact instrument is not available, substitute
calibration standards of equivalent accuracy.
A suggested alternate method would be to use the Keysight 3458A 8½ - digit
digital multimeter to measure less accurate yet stable sources. The output
value measured from the source can be entered into the instrument as the
target calibration value.
Table 4-1 Recommended test equipments
Application
Recommended equipment
Zero calibration
Shorting plug — Dual banana plug with
copper wire short between the two terminals
DC voltage
Fluke 5520A
<1/5 instrument 1 year spec
DC current
Fluke 5520A
<1/5 instrument 1 year spec
Resistance
Fluke 5520A
<1/5 instrument 1 year spec
AC voltage
Fluke 5520A
<1/5 instrument 1 year spec
AC current
Fluke 5520A
<1/5 instrument 1 year spec
Frequency
Fluke 5520A
<1/5 instrument 1 year spec
Diode
Fluke 5520A
<1/5 instrument 1 year spec
U3402A User’s and Service Guide
Recommended accuracy
requirements
—
63
4
Performance Test
Test Considerations
For optimum performance, all procedures should comply with the following
recommendations:
• Ensure that the calibration ambient temperature is stable and between
18 °C and 28 °C. Ideally the calibration should be performed at 23 °C ±1 °C.
• Ensure ambient relative humidity is less than 80%.
• Allow a one- hour warm- up period with a shorting plug connected to the Hi
and Lo input terminals.
• Use shielded twisted pair PTFE- insulated cables to reduce settling and
noise errors. Keep the input cables as short as possible.
NOTE
64
Please ensure that the calibration standards and test procedures used do not introduce
additional errors. Ideally, the standards used to verify and adjust the instrument should be
an order of magnitude more accurate than each instrument range full-scale error
specification.
U3402A User’s and Service Guide
Performance Test
4
Performance Verification Test Overview
Performance verification test is an extensive set of tests that are recommended
as an acceptance test when you first received the instrument.
Use the performance verification test to verify the measurement performance
of the instrument. The performance verification test uses the instrument's
specifications listed in Chapter 6, “Specifications and Characteristics”.
Performance Verification Test
The performance verification test is recommended as acceptance tests when
you first received the instrument. The acceptance test results should be
compared against the one- year test limits. After acceptance, you should repeat
the performance verification tests at every calibration interval.
If the instrument fails performance verification, adjustment or repair is
required. Contact your local Keysight Service Center for details.
NOTE
Make sure you have read “Test Considerations” on page 64 before doing the performance
verification test.
This test checks the full- scale reading accuracy of the instrument.
DC Voltage Verification Test
1 Connect the calibrator to the front panel Hi and Lo input terminals.
2 Select each function and range in the order shown in Table 4- 2. Provide the
input shown in Table 4- 2.
3 Make a measurement and observe the result. Compare measurement results
to the appropriate test limits shown in the Table 4- 2. (Be certain to allow
for appropriate source settling when using the Fluke 5520A.)
U3402A User’s and Service Guide
65
4
Performance Test
Table 4-2 DC voltage verification test
Function
Reading rate
Input
Range
Error from nominal
one year
DC voltage
Slow
0.000 V
120 mV
±8 µV
Medium
Slow
Medium
CAUTION
66
0.00000 V
1.2 V
±50 µV
0.0000 V
12 V
±0.5 mV
0.000 V
120 V
±5 mV
0.00 V
1000 V
±50 mV
0.00 V
400 mV
±50 µV
0.0000 V
4V
±500 µV
0.000 V
40 V
±5 mV
0.00 V
400 V
±50 mV
0.0 V
1000 V
±0.5V
100.000 mV
120 mV
±0.02 mV
1.00000 V
1.2 V
±0.17 mV
10.0000 V
12 V
±1.7 mV
100.000 V
120 V
±17 mV
1000.00 V
1000 V
±170 mV
360.00 mV
400 mV
±90 µV
3.6000 V
4V
±900 µV
36.000 V
40 V
±9 mV
360.00 V
400 V
±90 mV
1000.0 V
1000 V
±0.6 V
Set the calibrator output to 0 V before disconnecting it from the multimeter
input terminals.
U3402A User’s and Service Guide
Performance Test
4
DC Current Verification Test
1 Connect the calibrator to the front panel Hi and Lo input connectors.
2 Select each function and range in the order shown in Table 4- 3. Provide the
input shown in Table 4- 3.
3 Make a measurement and observe the result. Compare measurement results
to the appropriate test limits shown in Table 4- 3. (Be certain to allow for
appropriate source settling when using the Fluke 5520A.)
Table 4-3 DC current verification test
Function
Reading rate
Input
Range
DC current
Slow
0.0000 mA
12 mA
Error from nominal
one year
±1.5 µA
0.000 mA
120 mA
±5 µA
Medium
Slow
Medium
CAUTION
0.00 mA
1200 mA
±50 µA
0.0000 A
12 A
±0.5 mA
0.000 mA
40 mA
±6 µA
0.00 mA
120 mA
±30 µA
0.0 mA
1200 mA
±0.3 mA
0.000 A
12 A
±3 mA
10.0000 mA
12 mA
±6.5 µA
100.000 mA
120 mA
±55 µA
1000.00 mA
1200 mA
±2.05 mA
10.0000 A
12 A
±20.5 mA
36.000 mA
40 mA
±42 µA
100.00 mA
120 mA
±0.13 mA
1000.0 mA
1200 mA
±2.3 mA
10.000 A
12 A
±23 mA
Connect calibrator to multimeter’s A and Lo terminals before applying 10 A.
U3402A User’s and Service Guide
67
4
Performance Test
Resistance Verification Test
Configuration: 2- wire W
1 Select the resistance function.
2 Select each range in the order shown in Table 4- 4. Provide the resistance
value indicated. Compare measurement results to the appropriate test
limits shown in Table 4- 4. (Be certain to allow for appropriate source
settling.)
Table 4-4 2-wire W verification test
Function
Reading rate
Input
Range
Error from nominal
one year
2-wire W
Slow
0.000 W
120 W
±8 mW [1]
0.00000 W
1.2 kW
±50 mW [1]
0.0000 W
12 kW
±0.5 W [1]
0.000 W
120 kW
±5 W
0.00000 W
1.2 MW
±50 W
0.0000 W
12 MW
±0.5 kW
0.000 W
120 MW
±8 kW
0.00 W
400 W
±50 mW [1]
0.0000 W
4 kW
±0.3 W [1]
0.000 W
40 kW
±3 W [1]
0.00 W
400 kW
±30 W
0.0000 W
4 MW
±0.3 kW
0.000 W
40 MW
±3 kW
0.00 W
300 MW
±50 kW
100.000 W
120 W
±108 mW [1]
1.00000 kW
1.2 kW
±0.85 W [1]
10.0000 kW
12 kW
±6.5 W [1]
100.000 kW
120 kW
±65 W
1.00000 MW
1.2 MW
±0.65 kW
10.0000 MW
12 MW
±30.5 kW
100.000 MW
120 MW
±3.008 MW
Medium
Slow
68
U3402A User’s and Service Guide
Performance Test
4
Table 4-4 2-wire W verification test
Function
Reading rate
Input
Range
Error from nominal
one year
2-wire W
Medium
360.00 W
400 W
±0.41 W [1]
3.6000 kW
4 kW
±3.2 W [1]
36.000 kW
40 kW
±25 W [1]
360.00 kW
400 kW
±250 W
3.6000 MW
4 MW
±5.7 kW
20.000 MW
40 MW
±303 kW
200.00 MW
300 MW
±10.05 MW
Notes:
1 Specifications are for 2-wire ohms function using the Rel operation enabled to eliminate
lead resistance.
Configuration: 4- wire W
1 Select the resistance function.
2 Select each range in the order shown in Table 4- 5. Provide the resistance
value indicated. Compare measurement results to the appropriate test
limits shown in Table 4- 5. (Be certain to allow for appropriate source
settling.)
Table 4-5 4-wire W verification test
Function
Reading rate
Input
Range
Error from nominal
one year
4-wire W
Slow
0.000 W
120 W
±8 mW [1]
0.00000 W
1.2 kW
±50 mW [1]
0.0000 W
12 kW
±0.5 W
0.000 W
120 kW
±5 W
0.00000 W
1.2 MW
±50 W
0.0000 W
12 MW
±0.5 kW
0.000 W
120 MW
±8 kW
U3402A User’s and Service Guide
69
4
Performance Test
Table 4-5 4-wire W verification test
Function
Reading rate
Input
Range
Error from nominal
one year
4-wire W
Medium
0.00 W
400 W
±50 mW [1]
0.0000 W
4 kW
±0.3 W
0.000 W
40 kW
±3 W
0.00 W
400 kW
±30 W
0.0000 W
4 MW
±0.3 kW
0.000 W
40 MW
±3 kW
0.00 W
300 MW
±50 kW
100.000 W
120 W
±58 mW [1]
1.00000 kW
1.2 kW
±0.55 W [1]
10.0000 kW
12 kW
±5.5 W
100.000 kW
120 kW
±55 W
1.00000 MW
1.2 MW
±0.55 kW
10.0000 MW
12 MW
±30.5 kW
100.000 MW
120 MW
±3.008 MW
360.00 W
400 W
±0.23 W [1]
3.6000 kW
4 kW
±2.1 W
36.000 kW
40 kW
±21 W
360.00 kW
400 kW
±0.21 kW
3.6000 MW
4 MW
±5.7 kW
20.000 MW
40 MW
±0.303 kW
200.00 MW
300 MW
±10.05 MW
Slow
Medium
[1]
70
Specifications are for 4-wire ohms function using the Rel operation enabled to eliminate
lead resistance.
U3402A User’s and Service Guide
Performance Test
4
Diode Verification Test
Configuration: Diode
1 Connect the calibrator to the front panel Hi and Lo input terminals.
2 Select each function and range in the order shown in Table 4- 6. Provide the
input shown in Table 4- 6.
3 Make a measurement and observe the result. Compare measurement results
to the appropriate test limits shown in Table 4- 6. (Be certain to allow for
appropriate source settling when using the Fluke 5520A.)
Table 4-6 Diode verification test
Function
Reading rate
Diode
Slow
Voltage
Medium
Range
Error from nominal
one year
0.50000 V
1.2 V
±0.11 mV
1.00000 V
1.2 V
±0.17 mV
0.5000 V
2.5 V
±0.6 mV
2.0000 V
2.5 V
±0.7 mV
Frequency Verification Test
Configuration: Frequency
1 Select the frequency function.
2 Select each range in the order shown in Table 4- 7. Provide the input voltage
and frequency indicated. Compare measurement results to the appropriate
test limits shown in Table 4- 7. (Be certain to allow for appropriate source
settling.)
Table 4-7 Frequency verification test
Function
Reading
rate
Voltage
Input
frequency
Range
Error from nominal
one year
Frequency
Slow
1V
1000.00 Hz
1200 Hz
±0.08 Hz
U3402A User’s and Service Guide
71
4
Performance Test
AC Voltage Verification Test
Configuration: AC volts
1 Select the AC voltage function.
2 Select each range in the order shown in Table 4- 8. Provide the indicated
input voltage and frequency. Compare measurement results to the
appropriate test limits shown in Table 4- 8. (Be certain to allow for
appropriate source settling.)
Table 4-8 AC volts verification test
Function
Reading
rate
V RMS
Input
frequency
Range
AC voltage
Slow
12.000 mV
1 kHz
120 mV
Error from nominal
one year
±0.124 mV
100.000 mV
1 kHz
120 mV
±0.3 mV
0.12000 V
1 kHz
1.2 V
±1.24 mV
1.00000 V
1 kHz
1.2 V
±3 mV
1.2000 V
1 kHz
12 V
±12.4 mV
10.0000 V
1 kHz
12 V
±30 mV
12.000 V
1 kHz
120 V
±124 mV
Medium
CAUTION
72
100.000 V
1 kHz
120 V
±0.3 V
120.00 V
1 kHz
750 V
±1.24 V
750.00 V
1 kHz
750 V
±2.5 V
40.00 mV
1 kHz
400 mV
±0.48 mV
360.00 mV
1 kHz
400 mV
±1.12 mV
0.4000 V
1 kHz
4V
±4.8 mV
3.6000 V
1 kHz
4V
±11.2 mV
4.000 V
1 kHz
40 V
±48 mV
36.000 V
1 kHz
40 V
±112 mV
40.00 V
1 kHz
400 V
±480 mV
360.00 V
1 kHz
400 V
±1.12 V
120.0 V
1 kHz
750 V
±4.2 V
750.0 V
1 kHz
750 V
±5.5 V
Set the calibrator output to 0 V before disconnecting it from the multimeter
input terminals.
U3402A User’s and Service Guide
Performance Test
4
AC Current Verification Test
Configuration: AC current
1 Select the AC current function.
2 Select each range in the order shown in Table 4- 9. Provide the input
current and frequency indicated. Compare measurement results to the
appropriate test limits shown in Table 4- 9. (Be certain to allow for
appropriate source settling.)
Table 4-9 AC current verification test
Function
Reading
rate
Current
Input
frequency
Range
AC current
Slow
1.2000 mA
1 kHz
12 mA
Error from nominal
one year
±16 µA
10.0000 mA
1 kHz
12 mA
±60 µA
12.000 mA
1 kHz
120 mA
±0.16 mA
100.000 mA
1 kHz
120 mA
±0.6 mA
120.00 mA
1 kHz
1200 mA
±1.6 mA
1000.00 mA
1 kHz
1200 mA
±6 mA
1.2000 A
1 kHz
12 A
±22 mA
10.000 A
1 kHz
12 A
±110 mA
4.000 mA
1 kHz
40 mA
±60 µA
Medium
CAUTION
36.000 mA
1 kHz
40 mA
±0.22 mA
12.00 mA
1 kHz
120 mA
±0.18 mA
100.00 mA
1 kHz
120 mA
±0.62 mA
120.0 mA
1 kHz
1200 mA
±1.8 mA
1000.0 mA
1 kHz
1200 mA
±6.2 mA
1.200 A
1 kHz
12 A
±24 mA
10.000 A
1 kHz
12 A
±112 mA
Connect calibrator to multimeter’s A and Lo terminals before applying 10 A.
U3402A User’s and Service Guide
73
4
Performance Test
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User’s and Service Guide
5
Disassembly and Repair
Operating Checklist 76
Types of Service Available 77
Repackaging for Shipment 78
Cleaning 78
To Replace the Power Line Fuse 79
To Replace a Current Input Fuse 80
Electrostatic Discharge (ESD) Precautions 80
Mechanical Disassembly 81
Replaceable Parts 87
This chapter will help you troubleshoot a faulty multimeter.
It describes how to disassemble the multimeter, how to
obtain repair services, and lists the replaceable parts.
5
Disassembly and Repair
Operating Checklist
Before returning your multimeter to Keysight for service or repair check the
following items:
Is the multimeter inoperative?
q Verify the power line voltage setting.
q Verify the power line fuse is installed.
q Verify that the power cord is connected to the multimeter and to AC line
power.
q Verify the front panel power switch is depressed.
See page 79.
Is the multimeter’s current input inoperative?
q Verify the current input fuse.
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5
Types of Service Available
If your instrument fails during the warranty period, Keysight Technologies will
repair or replace it under the terms of your warranty. After your warranty
expires, Keysight offers repair services at competitive prices.
Extended Service Contracts
Many Keysight products are available with optional service contracts that
extend the covered period after the standard warranty expires. If you have
such a service contract and your instrument fails during the covered period,
Keysight Technologies will repair or replace it in accordance with the contract.
Obtaining Repair Service (Worldwide)
To obtain service for your instrument (in- warranty, under service contract, or
post- warranty), contact your nearest Keysight Technologies Service Center.
They will arrange to have your instrument repaired or replaced, and can
provide warranty or repair- cost information where applicable.
To obtain warranty, service, or technical support information you can contact
Keysight Technologies at one of the following telephone numbers:
In the United States:
In Europe:
In Japan:
(800) 829–4444
31 20 547 2111
0120–421–345
Or use our Web link for information on contacting Keysight worldwide:
www.keysight.com/find/assist
Or contact your Keysight Technologies representative.
Before shipping your instrument, ask the Keysight Technologies Service Center
to provide shipping instructions, including what components to ship. Keysight
recommends that you retain the original shipping carton for use in
such shipments.
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5
Disassembly and Repair
Repackaging for Shipment
If the instrument is to be shipped to Keysight for service or repair, be sure to:
• Attach a tag to the unit identifying the owner and indicating the required
service or repair. Include the model number and full serial number.
• Place the unit in its original container with appropriate packaging material
for shipping.
• Secure the container with strong tape or metal bands.
• If the original shipping container is not available, place your instrument in
a container which will ensure at least 4 inches of compressible packaging
material around all sides for the instrument. Use static- free packaging
materials to avoid additional damage to your instrument.
Keysight suggests that you always insure shipments.
Cleaning
Clean the outside of the multimeter with a soft, lint- free, slightly dampened
cloth. Do not use detergent. Disassembly is not required or recommended for
cleaning.
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5
To Replace the Power Line Fuse
The power line fuse is located within the multimeter’s fuse- holder assembly
on the rear panel. The multimeter is shipped from the factory with a
power- line fuse installed (according to country of destination). Refer to
Table 5- 1. If you determine that the fuse is faulty, replace it with one of the
same size and rating.
Table 5-1 Type of supplied fuse (according to country of destination)
Type of fuse (time-lag, low breaking fuse)
0.25A, 250V, 5x20 mm
Input line voltage
100 V to 120 V
Part number
0.125A, 250V, 5x20 mm
220 V to 240 V
A02-62-25648-1U
1 Disconnect the power cord. Depress tab 1 and
2 and pull the fuse holder from rear panel.
A02-62-25592-3U
2 Remove the line voltage selector from fuse
holder assembly.
2
1
3 Rotate the line voltage selector and reinstall
it back, so that the correct voltage appears in
the fuse holder window.
4 Replace fuse holder assembly in rear panel.
100, 120, 220 (230), or 240 Vac
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5
Disassembly and Repair
To Replace a Current Input Fuse
Both the mA and the A current input terminals are fuse protected. The fuse
for the mA input terminal is located on the front panel (see page 14). The fuse
is a 1.25 A, 500 V fuse (refer to Table 5- 2). If you determine that the fuse is
faulty, replace it with one of the same size and rating.
The fuse for the A current input terminal is located inside the multimeter (see
page 85) and requires partial disassembly of the multimeter. The fuse is a
15 A, 600 V fast- acting fuse (refer to Table 5- 2). If you determine that the fuse
is faulty, replace it with one of the same size and rating.
Table 5-2 Type of current input fuse
Type of fuse
1.25 A, 500 V fuse
Part number
15 A, 600 V fast-acting fuse
2110-1396
2110-1394
Electrostatic Discharge (ESD) Precautions
Almost all electrical components can be damaged by electrostatic discharge
(ESD) during handling. Component damage can occur at electrostatic
discharge voltages as low as 50 volts.
The following guidelines will help prevent ESD damage when servicing the
instrument or any electronic device.
• Disassemble instruments only in a static- free work area.
• Use a conductive work area to reduce static charges.
• Use a conductive wrist strap to reduce static charge accumulation.
• Minimize handling.
• Keep replacement parts in original static- free packaging.
• Remove all plastic, foam, vinyl, paper, and other static- generating materials
from the immediate work area.
• Use only anti–static solder suckers.
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5
Mechanical Disassembly
For procedures in this manual, the following tools are required for
disassembly:
• T15 Torx driver
• T20 Torx driver
• #2 Pozi–drive screw driver
WA R N I N G
Shock hazard. Only service–trained personnel who are aware of the hazards
involved should remove the instrument covers. To avoid electrical shock and
personal injury, make sure to disconnect the power cord from the multimeter before
removing the covers. Some circuits are active and have power applied even when
the power switch is turned off.
General Disassembly
1 Remove power and all cables from the multimeter.
2 Remove the carrying handle by rotating the handle upright and pulling it out
from the sides of the multimeter.
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5
Disassembly and Repair
3 Remove the multimeter’s bumpers. Pull from a corner and stretch the
bumpers off the multimeter.
4 Remove the rear bezel. Loosen the two captive screws in the rear bezel and
remove the rear bezel.
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5
5 Remove the cover. Remove the screw at the bottom of the cover and slide
the cover off the multimeter.
Front Panel Removal
1 Remove on/off switch push rod. Gently move the power switch push rod
toward the front of the multimeter to disengage it from the switch. Be
careful not to twist or bend the push rod.
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83
5
Disassembly and Repair
2 Remove the screw holding the front panel.
3 Disconnect the two ribbon cable connectors from the front panel.
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Disassembly and Repair
5
4 Disconnect the individual front panel wires shown below.
15 A current
fuse
5 There is now enough play to allow the side of the front panel to be pried
from the chassis and removed as an assembly.
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85
5
Disassembly and Repair
Front Panel Disassembly
1 Remove the keyboard and display assembly. Remove the two screws
holding the circuit board. Lift the keyboard and display assembly from the
plastic housing.
a The rubber keypad can now be pulled from the plastic housing.
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5
Replaceable Parts
This section contains information for ordering replacement parts for your
instrument. You can find the instrument support part list at Keysight’s Test &
Measurement Parts Catalog at http://www.keysight.com/find/parts
This parts list includes a brief description of each part with applicable
Keysight part number.
To order replaceable parts
You can order replaceable parts from Keysight using the Keysight part number.
Note that not all parts listed are available as field- replaceable parts.
To order replaceable parts from Keysight, do the following:
1 Contact your nearest Keysight Sales Office or Service Center.
2 Identify the parts by the Keysight part number shown in the support parts
list.
3 Provide the instrument model number and serial number.
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Disassembly and Repair
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6
Specifications and Characteristics
DC Specifications 90
AC Specifications 93
True RMS AC Voltage (AC Coupling Mode) 93
True RMS AC Voltage (AC+DC Coupling Mode) 94
True RMS AC Current (AC Coupling Mode) 95
True RMS AC Current (AC+DC Coupling Mode) 96
Frequency 96
Decibel (dB) Calculation 97
Supplemental Measurement Specifications 98
Display update rate 98
Measurement specifications 98
Reading rates 105
General Characteristics 107
To Calculate Total Measurement Error 109
Accuracy Specifications 110
Configuring for Highest Accuracy Measurements 111
This chapter describes the multimeter’s specifications and
operating specifications
6
Specifications and Characteristics
DC Specifications
Table 6-1 DC resolution, full scale reading, and accuracy [±(% of reading + count)]
Function
Rate
Slow
Voltage
Med
Fast
90
Range
Resolution
Maximum
reading
Accuracy
(One year; 23ºC
± 5ºC)
Typical input Burden voltage
[4]
impedance [1]
120.000 mV
0.001 mV
119.999
±0.012% + 8 [2]
10.0 MW
1.20000 V
0.00001 V
1.19999
±0.012% + 5
10.0 MW
12.0000 V
0.0001 V
11.9999
±0.012% + 5
11.1 MW
120.000 V
0.001 V
119.999
±0.012% + 5
10.1 MW
1000.00 V
0.01 V
1000.00 [3]
±0.012% + 5
10.0 MW
400.00 mV
0.01 mV
399.99
±0.012% + 5
10.0 MW
4.0000 V
0.0001 V
3.9999
±0.012% + 5
11.1 MW
40.000 V
0.001 V
39.999
±0.012% + 5
10.1 MW
400.00 V
0.01 V
399.99
±0.012% + 5
10.0 MW
1000.0 V
0.1 V
1000.0 [3]
±0.012% + 5
10.0 MW
400.0 mV
0.1 mV
399.9
±0.012% + 2
10.0 MW
4.000 V
0.001 V
3.999
±0.012% + 2
11.1 MW
40.00 V
0.01 V
39.99
±0.012% + 2
10.1 MW
400.0 V
0.1 V
399.9
±0.012% + 2
10.0 MW
1000 V
1V
1000 [3]
±0.012% + 2
10.0 MW
—
—
—
U3402A User’s and Service Guide
Specifications and Characteristics
6
Table 6-1 DC resolution, full scale reading, and accuracy [±(% of reading + count)] (continued)
Function
Rate
Slow
Current
Med
Fast
Slow
Diode/
Continuity
Resistance
/
Continuity
(2-wire)
Range
Resolution
Maximum
reading
Accuracy
(One year; 23ºC
± 5ºC)
12.0000 mA
0.0001 mA
11.9999
0.05% + 15 [2]
120.000 mA
0.001 mA
119.999
0.05% + 5
1200.00 mA
0.01 mA
1199.99
0.2% + 5
Typical input Burden voltage
[4]
impedance [1]
< 0.15 V
—
< 1.5 V
< 0.3 V
12.0000 A
0.0001A
11.9999
0.2% + 5
< 0.6 V
40.000 mA
0.001 mA
39.999
0.1% + 6
< 0.5 V
120.00 mA
0.01 mA
119.99
0.1% + 3
1200.0 mA
0.1 mA
1199.9
0.2% + 3
12.000 A
0.001 A
11.999
0.2% + 3
< 0.6 V
40.00 mA
0.01 mA
39.99
0.1% + 2
< 0.5 V
120.0 mA
0.1 mA
119.9
0.1% + 2
1200 mA
1 mA
1199
0.2% + 2
12.00 A
0.01 A
11.99
0.2% + 2
0.00001 V
1.19999 V
0.012% + 5
—
—
—
< 1.5 V
< 0.3 V
< 1.5 V
< 0.3 V
< 0.6 V
—
—
Med
—
0.0001 V
2.4999 V
0.012% + 5
—
—
Fast
—
0.001 V
2.499 V
0.012% + 2
—
—
0.001 W
119.999
0.1% + 8 [5]
—
—
399.99
0.1% + 5
[5]
—
—
399.9
0.1% + 2 [5]
—
—
Slow
Med
Fast
120.000 W
400.00 W
400.0 W
U3402A User’s and Service Guide
0.01 W
0.1 W
91
6
Specifications and Characteristics
Table 6-1 DC resolution, full scale reading, and accuracy [±(% of reading + count)] (continued)
Function
Rate
Range [6]
120.000 W
Slow
Resistance
Med
Fast
Resolution
0.001 W
Maximum
reading
119.999
Current source
Accuracy (One year; 23ºC ±
5ºC)
2-wire
0.5 mA
4-wire
0.1% + 8 [2]
[2]
0.05% + 8 [2]
0.05% + 5 [2]
1.20000 kW
0.00001 kW
1.19999
0.5 mA
0.08% + 5
12.0000 kW
0.0001 kW
11.9999
100 µA
0.06% + 5 [2]
0.05% + 5
120.000 kW
0.001 kW
119.999
10 µA
0.06% + 5
0.05% + 5
1.20000 MW
0.00001 MW
1.19999
1 µA
0.06% + 5
0.05% + 5
12.0000 MW
0.0001 MW
11.9999
100 nA
0.3% + 5
0.3% + 5
120.000 MW
0.001 MW
119.999
10 nA
3.0% + 8
3.0% + 8
400.00 W
0.01 W
399.99
0.5 mA
0.1% + 5 [2]
0.05% + 5 [2]
4.0000 kW
0.0001 kW
3.9999
100 µA
0.08% + 3 [2]
0.05% + 3
40.000 kW
0.001 kW
39.999
50 µA
0.06% + 3
0.05% + 3
400.00 kW
0.01 kW
399.99
5 µA
0.06% + 3
0.05% + 3
4.0000 MW
0.0001 MW
3.9999
500 nA
0.15% + 3
0.15% + 3
40.000 MW
0.001 MW
39.999
50 nA
1.5% + 3
1.5% + 3
300.00 MW
0.01 MW
299.99
10 nA
5.0% + 5
5.0% + 5
0.05% + 2
400.0 W
0.1 W
399.9
0.5 mA
0.1% + 2 [2]
4.000 kW
0.001 kW
3.999
100 µA
0.08% + 2
0.05% + 2
40.00 kW
0.01 kW
39.99
50 µA
0.06% + 2
0.05% + 2
400.0 kW
0.1 kW
399.9
5 µA
0.06% + 2
0.05% + 2
4.000 MW
0.001 MW
3.999
500 nA
0.15% + 2
0.15% + 2
40.00 MW
0.01 MW
39.99
50 nA
1.5% + 2
1.5% + 2
300.0 MW
0.1 MW
299.9
10 nA
5.0% + 2
5.0% + 2
Notes:
1 Input impedance is in parallel with capacitance < 120 pF.
2 Use Rel operation.
3 In VDC 1000 V range, 5% over-range (1050 VDC) is readable.
4 Typical at full scale reading and voltage across the input terminals.
5 Use Rel operation. If Rel operation is not used, add 0.2 W additional error.
6 In order to eliminate the noise interference, which might be induced to the test leads, it is recommended to use a shielded
test cable for measuring resistance above 100 kW
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6
AC Specifications
True RMS AC Voltage (AC Coupling Mode)
Table 6-2 AC voltage resolution, full scale reading, and accuracy [± (% of reading + count)]
Rate
Slow
Med
Fast
Accuracy (One year; 23ºC ± 5ºC) [1]
Range
Resolution
Maximum
reading
120.000 mV
0.001 mV
119.999
1% + 100
0.2% + 100
1.5% + 300
5% + 300
1.20000 V
0.00001 V
1.19999
1% + 100
0.2% + 100
1% + 100
3% + 200
12.0000 V
0.0001 V
11.9999
1% + 100
0.2% + 100
1% + 100
3% + 200
120.000 V
0.001 V
119.999
1% + 100
0.2% + 100
1% + 100
3% + 200
750.00 V
0.01 V
750.00 [4]
1% + 100 [2]
0.2% + 100
1% + 100
3% + 200 [3]
400.00 mV
0.01 mV
399.99
1% + 40
0.2% + 40
1.5% + 80
5% +120
4.0000 V
0.0001 V
3.9999
1% + 40
0.2% + 40
1% + 40
3% + 80
40.000 V
0.001 V
39.999
1% + 40
0.2% + 40
1% + 40
3% + 80
400.00 V
0.01 V
399.99
1% + 40 [2]
0.2% + 40
1% + 40
3% + 80
0.2% + 40
1% + 40
3% + 80 [3]
20 Hz to 45 Hz
45 Hz to 10kHz
10 kHz to
30 kHz
30 kHz to
100 kHz [2]
750.0 V
0.1 V
750.0
1% + 40 [2]
400.0 mV
0.1 mV
399.9
1% + 5
0.2% + 5
1.5% + 10
5% + 15
4.000 V
0.001 V
3.999
1% + 5
0.2% + 5
1% + 5
3% + 10
40.00 V
0.01 V
39.99
1% + 5
0.2% + 5
1% + 5
3% + 10
0.2% + 5
1% + 5
3% + 10
0.2% + 5
1% + 5
3% + 10 [3]
400.0 V
0.1 V
399.9
1% + 5 [2]
750 V
1V
750
1% + 5 [2]
Notes:
1 Specified accuracy at input > 5% of full scale.
2 For input < 200 V RMS.
3 For input < 500 V RMS.
4 In VAC 750 V range, 787.5 V RMS is readable.
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6
Specifications and Characteristics
True RMS AC Voltage (AC+DC Coupling Mode)
Table 6-3 AC voltageac+dc resolution, full scale reading, and accuracy [± (% of reading + count)]
Rate
Slow
Med
Fast
Accuracy (One year; 23ºC ± 5ºC) [2]
Resolution
Maximum
reading
45 Hz to 10kHz
10 kHz to 30 kHz
30 kHz to 100 kHz
120.000 mV
0.001 mV
119.999
0.2% + 100
1.5% + 300
5% + 300
1.20000 V
0.00001 V
1.19999
0.2% + 100
1% + 100
3% + 200
12.0000 V
0.0001 V
11.9999
0.2% + 100
1% + 100
3% + 200
120.000 V
0.001 V
119.999
0.2% + 100
1% + 100
3% + 200
750.00 V
0.01 V
750.00 [3]
0.2% + 100
1% + 100
3% + 200 [4]
400.00 mV
0.01 mV
399.99
0.2% + 45
1.5% + 83
5% + 125
4.0000 V
0.0001 V
3.9999
0.2% + 43
1% + 43
3% + 83
40.000 V
0.001 V
39.999
0.2% + 43
1% + 43
3% + 83
400.00 V
0.01 V
399.99
0.2% + 43
1% + 43
3% + 83
750.0 V
0.1 V
750.0
0.2% + 43
1% + 43
3% + 83 [4]
400.0 mV
0.1 mV
399.9
0.2% + 7
1.5% + 12
5% + 18
4.000 V
0.001 V
3.999
0.2% + 7
1% + 7
3% + 12
40.00 V
0.01 V
39.99
0.2% + 7
1% + 7
3% + 12
400.0 V
0.1 V
399.9
0.2% + 7
1% + 7
3% + 12
750 V
1V
750
0.2% + 7
1% + 7
3% + 12 [4]
Range [1]
Notes:
1 VDC and VAC are automatically set at the same range.
2 Specified accuracy at input > 5% of full scale.
3 In VAC 750 V range, 787.5 V RMS is readable.
4 For input < 500 V RMS.
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6
True RMS AC Current (AC Coupling Mode)
Table 6-4 AC current resolution, full scale reading, burden voltage, and accuracy [± (% of reading +
count)]
Rate
Slow
Med
Fast
Maximum
Burden voltage [1]
reading
Range
Resolution
12.0000 mA
0.0001 mA
11.9999
< 0.15 V
120.000 mA
0.001 mA
119.999
< 1.5 V
1200.00 mA
0.01 mA
1199.99
12.0000 A
0.0001A
11.9999
40.000 mA
0.001 mA
120.00 mA
0.01 mA
1200.0 mA
12.000 A
Accuracy (One year; 23ºC ± 5ºC) [2]
45 Hz to 2 kHz
2 kHz to 10
kHz
1.5% + 100
0.5% + 100
2% + 200
1.5% + 100
0.5% + 100
2% + 200
< 0.3 V
1.5% + 100
0.5% + 100
2% + 200
< 0.6 V
2% + 100 (<1.2 A)
1% + 100
–
39.999
< 0.5 V
1.5% + 40
0.5% + 40
2% + 80
119.99
< 1.5 V
1.5% + 12
0.5% + 12
2% + 30
0.1 mA
1199.9
< 0.3 V
1.5% + 12
0.5% + 12
2% + 30
0.001 A
11.999
< 0.6 V
1.5% + 12 (<1.2 A)
1% + 12
–
40.00 mA
0.01 mA
39.99
< 0.5 V
1.5% + 5
0.5% + 5
2% + 10
120.0 mA
0.1 mA
119.9
< 1.5 V
1.5% + 2
0.5% + 2
2% + 5
1200 mA
1 mA
1199
< 0.3 V
1.5% + 2
0.5% + 2
2% + 5
12.00 A
0.01 A
11.99
< 0.6 V
2% + 2 (<1.2 A)
1% + 2
–
20 Hz to 45 Hz
Notes:
1 Typical at full scale reading and voltage across the input terminals.
2 Specified accuracy at input > 5% of full scale.
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6
Specifications and Characteristics
True RMS AC Current (AC+DC Coupling Mode)
Table 6-5 AC current ac+dc resolution, full scale reading, burden voltage, and accuracy [± (% of reading + count)]
Rate
Slow
Med
Fast
Range
Resolution
Maximum
reading
Burden voltage [1]
Accuracy (one year; 23ºC ± 5ºC) [2]
45 Hz to 2 kHz
2 kHz to 10 kHz
12.0000 mA
0.0001 mA
11.9999
< 0.15 V
0.5% + 100
2% + 200
120.000 mA
0.001 mA
119.999
< 1.5 V
0.5% + 100
2% + 200
1200.00 mA
0.01 mA
1199.99
< 0.3 V
0.5% + 100
2% + 200
12.0000 A
0.0001 A
11.9999
< 0.6 V
1% + 100
–
40.000 mA
0.001 mA
39.999
< 0.5 V
0.5% + 42
2% + 80
120.00 mA
0.01 mA
119.99
< 1.5 V
0.5% + 15
2% + 30
1200.0 mA
0.1 mA
1199.9
< 0.3 V
0.5% + 15
2% + 30
12.000 A
0.001 A
11.999
< 0.6 V
1% + 15
–
40.00 mA
0.01 mA
39.99
< 0.5 V
0.5% + 7
2% + 12
120.0 mA
0.1 mA
119.9
< 1.5 V
0.5% + 4
2% + 7
1200 mA
1 mA
1199
< 0.3 V
0.5% + 4
2% + 7
12.00 A
0.01 A
11.99
< 0.6 V
1% + 4
–
Notes:
1 Typical at full scale reading and voltage across the input terminals.
2 Specified accuracy at input > 5% of full scale.
Frequency
Table 6-6 Frequency resolution and accuracy [± (% of reading + count)]
Range
1200 Hz
Measurement range
Resolution
Maximum
reading
Accuracy (One year;
23ºC ± 5ºC) [1]
Input sensitivity
(Sine wave)
5 Hz to 1200 Hz
0.01 Hz
1199.99
0.005% + 3
40 mV RMS
12 kHz
10 Hz to 12 kHz
0.0001 kHz
11.9999
0.005% + 2
40 mV RMS
120 kHz
100 Hz to 120 kHz
0.001 kHz
119.999
0.005% + 2
40 mV RMS
1 MHz
1 kHz to 1 MHz
0.0001 MHz
1.1999
0.005% + 2
0.5 V RMS
Notes:
1 Specified accuracy at input > 5% of full scale.
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Decibel (dB) Calculation
Table 6-7 Range and accuracy (±dB)
Rate
Slow
Medium
Voltage range
[1][2]
dBm [3] range at
600 W ref
Accuracy (One year; 23ºC ± 5ºC) [1]
20 Hz to 45 Hz 45 Hz to 10 kHz 10 kHz to 100 kHz
120.000 mV
6 mV to 120 mV
– 42.20 to – 16.20
1.0
0.2
1.0
1.20000 V
120 mV to 1.2 V
– 16.20 to 3.80
0.8
0.1
0.8
12.0000 V
1.2 V to 12 V
3.80 to 23.80
0.8
0.1
0.8
120.000 V
12 V to 120 V
23.80 to 43.80
0.8
0.1
0.8
–
1000.00 VDC
120 V to 1000 V
43.80 to 62.22
–
1.0 [4]
750.00 VAC
120 V to 750 V
43.80 to 59.72
–
1.0 [4]
–
400.00 mV
20 mV to 400 mV
– 31.76 to – 5.74
1.0
0.2
1.0
4.0000 V
400 mV to 4 V
– 5.74 to 14.26
0.8
0.1
0.8
40.000 V
4 V to 40 V
14.26 to 34.26
0.8
0.1
0.8
400.00 V
40 V to 400 V
34.26 to 54.26
0.8
0.1
0.8
–
1.0 [4]
–
–
1000.0 VDC
Fast
Input voltage
400 V to 1000 V
54.26 to 62.22
750.0 VAC
400 V to 750 V
54.26 to 59.72
–
1.0 [4]
400.0 mV
20 mV to 400 mV
– 31.76 to – 5.74
1.0
0.2
1.0
4.000 V
400 mV to 4 V
– 5.74 to 14.26
0.8
0.1
0.8
40.00 V
4 V to 40 V
14.26 to 34.26
0.8
0.1
0.8
400.0 V
40 V to 400 V
34.26 to 54.26
0.8
0.1
0.8
–
–
1000 VDC
400 V to 1000 V
54.26 to 62.22
–
1.0 [4]
750 VAC
400 V to 750 V
54.26 to 59.72
–
1.0 [4]
Notes:
1 Autoranging is used when dBm operation is enabled.
2 In VAC 750 V range, 5% over-range is readable.
3 Reading displayed in dB when Rel operation is used.
4 For input voltage at frequency between 45 Hz to 1 kHz.
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Specifications and Characteristics
Supplemental Measurement Specifications
Display update rate
Table 6-8 Full scale display update rates
Display update rates
Display counts
Slow
119,999
Medium
39,999
Fast
3,999
Measurement specifications
Table 6-9 Supplemental measurement specifications
DC voltage
• Measurement method
• Sigma Delta A-to-D converter
• Input resistance
• 10 MW ± 2% range (typical)
• Maximum input voltage
• 1000 VDC or PEAK AC on all ranges
• Input protection
• 1000 V on all ranges
• Response time
• Approximately 1.0 second when the displayed reading reaches 99.9% DC value of the tested
input signal at the same range.
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6
Table 6-9 Supplemental measurement specifications (continued)
DC current
• Shunt resistance
• 0.1 W to 10 W for 12 mA to 1.2 A ranges
• 0.01 W for 12 A range
• Maximum input and overload protection
• mA input terminal: 1200 mADC or AC RMS. Protected with 1.25 A/500 V, IEC-127 sheet, FB
fuse
• 12 A input terminal: 10 ADC or AC RMS continuous, or 12 ADC or AC RMS for 30 seconds
maximum. Protected with 15 A/600 V, breaking capacity 10,000 A FB fuse
• Response time
• Approximately 1.0 seconds when the displayed reading reaches 99.9% DC value of the tested
input signal at the same range
AC voltage (True RMS AC Coupling Mode)
• Measurement method
• AC coupled true RMS—measure the AC component with up to 400 VDC bias on any range
• Crest factor
• Maximum 3:0 at full scale
• Input impedance
• 1 MW ± 2% in parallel with <120 pF on all ranges
• Maximum input voltage
• 750 V RMS /1100 V PEAK
• 2x107 V-Hz product on any range, normal mode input
• 1x106 V-Hz product on any range, common mode input
• Overload ranging
• Will select higher range if peak input overload is detected during autorange. Overload is
reported in manual ranging
• Input protection
• 750 V RMS on all ranges
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Specifications and Characteristics
Table 6-9 Supplemental measurement specifications (continued)
• Response time
• Approximately 1.5 seconds when the displayed reading reaches 99.9% AC RMS value of the
tested input signal at the same range.
AC voltage (True RMS AC + DC Coupling Mode)
• Measurement method
• AC+DC coupled true RMS—measure the AC component with up to 400 VDC bias on any
range
• Crest factor
• Maximum 3:0 at full scale
• Input impedance
• 1 MW ± 2% in parallel with <120 pF of all ranges
• Maximum input voltage
• 750 V RMS /1100 V PEAK
• 2x107 V-Hz product on any range, normal mode input
• 1x106 V-Hz product on any range, common mode input
• Overload ranging
• Will select higher range if peak input overload is detected during autorange. Overload is
reported in manual ranging
• Input protection
• 750 V RMS on all ranges
• Response time
• Approximately 2.5 seconds when the displayed reading reaches 99.9% AC RMS value of the
tested input signal at the same range
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Table 6-9 Supplemental measurement specifications (continued)
AC current (True RMS, AC Coupling Mode)
• Measurement method
• DC coupled to the fuse and current shunt, AC coupled true RMS measurement (measures the
AC component only)
• Crest factor
• Maximum 3:0 at full scale
• Shunt resistance
• 0.1 W to 10 W for 10 mA to 1.2 A ranges
• 0.01 W for 12 A range
• Input protection
• mA input terminal: 1200 mADC or AC RMS. Protected with 1.25 A/500 V, IEC-127 sheet, FH
fuse
• 12 A input terminal: 10 ADC or AC RMS continuous, or 12 ADC or AC RMS for 30 seconds
maximum. Protected with 15 A/600 V, breaking capacity 10,000 A FH fuse.
• Response time
• Approximately 1.5 seconds when the displayed reading reaches 99.9% AC RMS value of the
tested input signal at the same range
AC current (True RMS, AC Coupling Mode)
• Measurement method
• AC+DC coupled to the fuse and current shunt, AC+DC coupled true RMS measurement
(measures the AC component only)
• Crest factor
• Maximum 3:0 at full scale
• Measurement range
• VDC and VAC are automatically set at the same range.
• Response time
• Approximately 1.5 seconds when the displayed reading reaches 99.9% AC RMS value of the
tested input signal at the same range
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6
Specifications and Characteristics
Table 6-9 Supplemental measurement specifications (continued)
Resistance (2-wire W and 4-wire W)
• Measurement method
• 2-wire Ohms or 4-wire Ohms
• Open-circuit voltage
• Limited to < +9 VDC
• Zeroing error
• 0.05 W or less (excluding test lead resistance) in each range when Rel operation is used
• Input protection
• 500 V on all ranges
• Response time
•
•
•
•
Approximately 1.5 seconds for 12 MW and ranges below 12 MW
Approximately 5 seconds for 40 MW
Approximately 10 seconds for 120 MW
Approximately 23 seconds for 300 MW
Diode/continuity
• Measurement method
• 0.5 mA ±0.2% constant current source, open-circuit voltage limited to < +9 V
• Test current
• Approximately 0.5 mADC
• Open-circuit voltage
• Limited to < +9 VDC
• Continuity threshold
• 10 W fixed
• Continuity level
• Approximately < +50 mVDC
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Table 6-9 Supplemental measurement specifications (continued)
• Audible tone
• Continuous beep for continuity and single tone for normal forward-biased diode or
semiconductor junction
• Input protection
• 500 V RMS on all ranges
Resistance/continuity (2-wire W)
• Measurement method
• 2-wire Ohms
• Test current
• Approximately 0.5 mADC
• Open-circuit voltage
• Limited to < +9 VDC
• Audible tone
• Continuous beep for continuity and single tone for normal forward-biased diode or
semiconductor junction
• Zeroing error
• 0.05 W or less (excluding test lead resistances) in each range when Rel operation is used
• Input protection
• 500 V RMS on all ranges
Frequency
• Measurement method
• Reciprocal counting technique. AC coupled input using AC voltage function
• Crest factor
• Maximum 3:0 at full scale
• Signal level
• 10% of range to full scale input on all ranges
• Auto or manual range selection
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6
Specifications and Characteristics
Table 6-9 Supplemental measurement specifications (continued)
• Gate time
• 0.1 second or 1 period of the input signal, whichever is longer
• Input impedance
• 1 MW ± 2% in parallel with <120 pF of all ranges
• Maximum input voltage
• 750 V RMS /1100 V PEAK
• 2x107 V-Hz product on any range, normal mode input
• 1x106 V-Hz product on any range, common mode input
• Input protection
• 750 V RMS on all ranges
• Response time
• Approximately 1.5 seconds when the displayed reading reaches 99.9% of frequency value
Measurement Noise Rejection
• Common mode reject ratio (CMRR) for 1 kW unbalanced LO lead
• 50/60 Hz ± 0.1%: DC > 90 dB
• Normal mode rejection ratio (NMRR)
• 50/60 Hz ± 0.1%: > 50 dB
dBm Operation
• 0 dBm
• 1 mW at 600 W reference impedance
• Resolution
• Slow: 0.01 dB for all ranges
• Medium: 0.01 dB for all ranges
• Fast: 0.1 dB for all ranges
• Reference impedance [1]
• 2 W [2], 4 W [2], 8 W [2], 16 W [2], 50 W, 75 W, 93 W, 110 W, 124 W, 125 W, 135 W, 150 W, 250 W, 300
W, 500 W, 600 W, 800 W, 900 W, 1000 W, 1200 W, or 8000 W
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Table 6-9 Supplemental measurement specifications (continued)
Math Operation
• dBm, Rel, MinMax, Comp, Hold
I/O Interface
• RS232 [3]
Notes:
1 Reference impedance is displayed on the secondary display.
2 Reading displayed in watts (Audio power).
3 For calibration use only.
NOTE
When Vac+dc measurement function is selected, the VDC input impedance is parallel with
an AC-couples 1.1 MW divider.
Reading rates
Table 6-10 Reading rates for single display (readings/second (approx))
Measurement functions
Slow
Medium
Fast
DCV
2.2
5.5
22.0
DCA
2.2
5.5
22.0
Diode
2.2
5.5
22.0
ACV
2.2
5.5
22.0
ACA
2.2
5.5
22.0
2-wire W
2.2
5.5
22.0
4-wire W, 4MW/1.2MW range and below
0.7
0.9
1.0
4-wire W, 12MW range and above
1.5
1.8
2.0
Frequency (5Hz)
1.0
1.7
2.3
ACV + DCV
0.8
1.1
1.6
ACA + DCA
0.5
0.7
0.9
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Specifications and Characteristics
Table 6-11 Reading rates for the dual display (readings/second (approx))
Measurement functions
Slow
Medium
Fast
DCV / ACV
0.8
1.1
1.6
DCA / ACA
0.5
0.7
0.9
DCV / DCA
0.7
1.1
1.6
DCV / ACA
0.1
0.4
0.5
ACV / ACA
0.1
0.4
0.5
ACV / DCA
0.8
1.1
1.6
ACV / Frequency [1]
1.0
1.7
2.3
ACA / Frequency [1]
1.2
1.7
2.5
ACV + DCV / DCV
0.7
1.1
1.6
ACA + DCA / DCV
0.1
0.3
0.4
ACA + DCA / ACV
0.1
0.3
0.4
ACA + DCA / DCA
0.5
0.7
0.9
dBm (ACV) / Reference
2.2
5.5
22.0
dBm (ACV) / ACV
2.2
4.3
11.0
dBm (ACV) / DCV
0.8
1.1
1.8
1.0
1.7
2.4
dBm (ACV) / Frequency [1]
Notes:
1 This reading rate depends on the frequency of the signal, the table itself shows the worst
possible case.
2 This table shows the typical combinations of measurement functions for the dual display.
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General Characteristics
Table 6-12 General characteristics
Power Supply
• 100 V/120 V/220 V/240 V ± 10%
• AC line frequency 50 Hz to 60Hz
Power Consumption
• 16 VA maximum
Input Power Option
• Manual ranging (100 VAC to 240 VAC ±10%)
Fuse
• Terminal:
• 1.25 A, 500 V FB fuse
• 15 A, 600 V FB fuse (internal)
• Power line (according to country of destination):
• 0.25 A, 250 V SB fuse OR
• 0125 A, 250 V SB fuse
Display
• Highly visible vacuum fluorescent display (VFD)
Operating Environment
• Operating temperature from 0 °C to + 50 °C
• Relative humidity up to 80% at 28 °C RH (non-condensing)
• Altitude up to 2000 meters
• Pollution degree 2
• For indoor use only
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Specifications and Characteristics
Table 6-12 General characteristics
Storage Compliance
• – 20 °C to 60 °C
• Relative humidity at 5% to 90% RH (non-condensing)
Safety Compliance
• IEC 61010-1:2001/EN61010-1:2001 (2nd Edition)
• Canada: CAN/CSA-C22.2 No. 61010-1-04
• USA: ANSI/UL 61010-1:2004
EMC Compliance
• IEC 61326-1:2005/EN61326-1:2006
• Canada: ICES/NMB-001:2004
• Australia/New Zealand: AS/NZS CISPR11:2004
Shock and Vibration
• Tested to IEC/EN 60068-2
I/O Connector
• Output connectors
I/O Interface
• RS232 (For calibration use only)
Dimension (HxWxD)
• 226.00 × 105.00 × 305.00 mm (with bumpers)
• 215.00 × 87.00 × 282.00 mm (without bumpers)
Weight
• 3.44 kg (with bumpers)
Warm Up Time
• 30 minutes
Calibration Cycle
• 1 year
Warranty
• 3 years
• 3 months for standard shipped accessories
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To Calculate Total Measurement Error
The multimeter's accuracy specifications are expressed in the form of:
(% of reading + count)
In addition to the reading error and count error, you may need to add
additional errors for certain operating conditions. Check the list below to make
sure you include all measurement errors for a given function. Also, make sure
you apply the conditions as described in the footnotes on the specification
pages.
• If you are operating the multimeter outside the temperature range
specified, apply an additional temperature coefficient error.
• For AC voltage and AC current measurements, you may need to apply
an additional low frequency error or crest factor error.
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Specifications and Characteristics
Accuracy Specifications
Transfer Accuracy
Transfer accuracy refers to the error introduced by the multimeter due to
noise and short–term drift. This error becomes apparent when comparing two
nearly- equal signals for the purpose of "transferring" the known accuracy of
one device to the other.
One-Year Accuracy
These long–term accuracy specifications are valid at the calibration
temperature (Tcal) ± 5 °C temperature range. These specifications include the
initial calibration errors plus the multimeter's long–term drift errors.
Temperature Coefficients
Accuracy is usually specified at the calibration temperature (Tcal) ± 5 °C
temperature range. This is a common temperature range for many operating
environments. You must add additional temperature coefficient errors to the
accuracy specification if you are operating the multimeter at 0 °C to 18 °C and
28 °C to 50 °C temperature range (the specification is per °C).
Temperature Coefficient = add ± 0.15 x [the applicable accuracy)/°C]
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6
Configuring for Highest Accuracy Measurements
The measurement configurations shown below assume that the multimeter
is in its power–on or reset state. It is also assumed that auto–ranging is
enabled to ensure proper full scale range selection.
• Select 5½ digits.
• Null the test lead resistance for 2–wire ohms measurements, and to
remove any interconnection offset for DC voltage measurements.
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Specifications and Characteristics
THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.
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U3402A User’s and Service Guide
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Contact us
To obtain service, warranty or technical support
assistance, contact us at the
following phone numbers:
United States:
(tel) 800 829 4444
(fax) 800 829 4433
Canada:
(tel) 877 894 4414
(fax) 800 746 4866
China:
(tel) 800 810 0189
(fax) 800 820 2816
Europe:
(tel) 31 20 547 2111
Japan:
(tel) (81) 426 56 7832 (fax) (81) 426 56 7840
Korea:
(tel) (080) 769 0800
(fax) (080) 769 0900
Latin America:
(tel) (305) 269 7500
Taiwan:
(tel) 0800 047 866
(fax) 0800 286 331
Other Asia Pacific Countries:
(tel) (65) 6375 8100
(fax) (65) 6755 0042
Or visit the Keysight World Wide Web at:
www.keysight.com/find/assist
Product specifications and descriptions in this
document are subject to change without notice.
Always refer to the English version on the Keysight Web site for the latest revision.
This information is subject to change without notice.
© Keysight Technologies 2009 - 2015
Edition 9, March 20, 2015
*U3402-90001*
U3402-90001
www.keysight.com