Keysight Technologies U1231A, U1233A, U1232A Service Manual
Keysight U1231A, U1232A,
and U1233A Handheld
Digital Multimeter
Service Guide
Notices
CAUTION
WARNING
Copyright Notice
© Keysight Technologies 2011 – 2017
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.
Manual Part Number
U1231-90035
Edition
Edition 10, June 30, 2017
Printed in:
Printed in Malaysia
Published by:
Keysight Technologies
Bayan Lepas Free Industrial Zone,
11900 Penang, Malaysia
Technology Licenses
The hard ware 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.
Declaration of Conformity
Declarations of Conformity for this
product and for other Keysight
products may be downloaded from the
Web. Go to http://www.keysight.com/
go/conformity. You can then search by
product number to find the latest
Declaration of Conformity.
U.S. Government Rights
The Software is “commercial computer
software,” as defined by Federal
Acquisition Regulation (“FAR”) 2.101.
Pursuant to FAR 12.212 and 27.405-3
and Department of Defense FAR
Supplement (“DFARS”) 227.7202, the
U.S. government acquires commercial
computer software under the same
terms by which the software is
customarily provided to the public.
Accordingly, Keysight provides the
Software to U.S. government
customers under its standard
commercial license, which is embodied
in its End User License Agreement
(EULA), a copy of which can be found
at http://www.keysight.com/find/
sweula. The license set forth in the
EULA represents the exclusive authority
by which the U.S. government may use,
modify, distribute, or disclose the
Software. The EULA and the license set
forth therein, does not require or
permit, among other things, that
Keysight: (1) Furnish technical
information related to commercial
computer software or commercial
computer software documentation that
is not customarily provided to the
public; or (2) Relinquish to, or
otherwise provide, the government
rights in excess of these rights
customarily provided to the public to
use, modify, reproduce, release,
perform, display, or disclose
commercial computer software or
commercial computer software
documentation. No additional
government requirements beyond
those set forth in the EULA shall apply,
except to the extent that those terms,
rights, or licenses are explicitly required
from all providers of commercial
computer software pursuant to the FAR
and the DFARS and are set forth
specifically in writing elsewhere in the
EULA. Keysight shall be under no
obligation to update, revise or
otherwise modify the Software. With
respect to any technical data as
defined by FAR 2.101, pursuant to FAR
12.211 and 27.404.2 and DFARS
227.7102, the U.S. government
acquires no greater than Limited Rights
as defined in FAR 27.401 or DFAR
227.7103-5 (c), as applicable in any
technical data.
Warranty
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.
Safety Information
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.
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.
2 Keysight U1231A, U1232A, and U1233A Service Guide
Safety Symbols
CAT III
600 V
The following symbols on the instrument and in the documentation indicate
precautions that must be taken to maintain safe operation of the instrument.
DC (Direct current or voltage)
AC (Alternating current or voltage)
Caution, risk of danger (refer to this
manual for specific Warning or Caution
information)
Equipment protected throughout by
double insulation or reinforced
insulation
Earth (ground) terminal
Category III 600 V overvoltage
protection
Keysight U1231A, U1232A, and U1233A Service Guide 3
Safety Considerations
CAUTION
Read the information below before using this instrument.
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 for design, manufacture, and intended use of the instrument. Keysight
Technologies assumes no liability for the customer’s failure to comply with these
requirements.
– Disconnect circuit power and discharge all high-voltage capacitors
before testing resistance, continuity, diodes, or capacitance.
– Use the proper terminals, function, and range for your measurements.
– This device is for use at altitudes of up to 2,000 m.
– Never measure voltage when current measurement is selected.
– Always use the specified battery type. The power for the meter is
supplied with four standard AAA 1.5 V batteries. Observe the correct
polarity markings before you insert the batteries to ensure proper
insertion of the batteries in the meter.
– You are advised to use low leakage batteries when changing to new
batteries. Please remember to remove the batteries when the meter is not
in use for a long period of time. Warning on the risk of battery leakage.
– To avoid damage to the instrument from battery leakage:
– Always remove dead batteries immediately.
– Always remove the batteries and store them separately if the
instrument is not going to be used or is being stored for a long period
of time.
4 Keysight U1231A, U1232A, and U1233A Service Guide
WARNING
– Do not use the meter if it is damaged. Before you use the meter, inspect
the case. Look for cracks or missing plastic. Pay particular attention to
the insulation surrounding the connectors.
– Inspect the test leads for damaged insulation or exposed metal. Check
the test leads for continuity. Replace damaged test leads before you use
the meter.
– Do not operate the meter around explosive gas, vapor, or wet
environments.
– Do not apply more than the rated voltage (as marked on the meter)
between terminals, or between terminal and earth ground.
– Never use the meter in wet conditions or when there is water on the
surface. If the meter is wet, ensure that the meter is dried only by trained
personnel.
– Before use, verify the meter's operation by measuring a known voltage.
– When measuring current, turn off the circuit power before connecting the
meter in the circuit. Remember to place the meter in series with the
circuit.
– When servicing the meter, use only the specified replacement parts.
– Use caution when working above 60 V DC, 30 V AC rms, or 42.4 V peak.
Such voltages pose a shock hazard.
Keysight U1231A, U1232A, and U1233A Service Guide 5
– Do not use the VZ
(low input impedance) function to measure
LOW
voltages in circuits that could be damaged by this function’s low input
impedance of 3 k
Ω.
– When using the probes, keep your fingers behind the finger guards on the
probes.
– Connect the common test lead before you connect the live test lead.
When you disconnect the leads, disconnect the live test lead first.
– Remove the test leads from the meter before you open the battery cover.
WARNING
– Do not operate the meter with the battery cover or portions of the cover
removed or loosened.
– To avoid false readings, which may lead to possible electric shock or
personal injury, replace the battery as soon as the low battery indicator
appears and flashes.
6 Keysight U1231A, U1232A, and U1233A Service Guide
Measurement Category
The U1231A, U1232A, and U1233A has a safety rating of CAT III, 600 V.
Measurement CAT I Measurements performed on circuits not directly
connected to the AC mains. Examples are measurements on circuits not derived
from the AC mains and specially protected (internal) mains-derived circuits.
Measurement CAT II Measurements performed on circuits directly connected
to a low-voltage installation. Examples are measurements on household
appliances, portable tools, and similar equipment.
Measurement CAT III Measurements performed in the building installation.
Examples are measurements on distribution boards, circuit- breakers, wiring,
including cables, bus-bars, junction boxes, switches, socket outlets in the fixed
installation, and equipment for industrial use, and some other equipment
including stationary motors with permanent connection to the fixed installation.
Measurement CAT IV Measurements performed at the source of the
low-voltage installation. Examples are electricity meters and measurements on
primary overcurrent protection devices and ripple control units.
Keysight U1231A, U1232A, and U1233A Service Guide 7
Environmental Conditions
NOTE
This U1231A, U1232A, and U1233A is designed for indoor use and in an area with
low condensation. The table below shows the general environmental requirements
for this instrument.
Environmental conditions Requirements
Operating temperature Full accuracy from –10 °C to 55 °C
Operating humidity
Storage temperature –40 °C to 60 °C
Altitude Up to 2000 meters
Pollution degree Pollution degree II
The U1231A/U1232A/U1233A Handheld Digital Multimeter complies with the
following safety and EMC requirements:
– EN 61010-1 (IEC 61010-1:2001) for CAT III 600 V
– ANSI/UL 61010-1:2004
– CAN/CSA-C22.2 No. 61010-1-04
– Commercial limits compliance with EN61326-1
Full accuracy up to 80% RH (relative
humidity) for temperature up to 30 °C,
decreasing linearly to 50% RH at 55 °C
8 Keysight U1231A, U1232A, and U1233A 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.
ICES/NMB-001 indicates that this ISM
device complies with the
Canadian ICES-001.
Cet appareil ISM est conforme a la
norme NMB-001 du Canada.
The CSA mark is a registered
trademark of the Canadian
Standards Association.
The RCM 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.
This instrument complies with the
WEEE Directive (2002/96/EC) marking
requirement. This affixed product label
indicates that you must not discard
this electrical or electronic product in
domestic household waste.
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.
Keysight U1231A, U1232A, and U1233A Service Guide 9
Waste Electrical and Electronic Equipment (WEEE) Directive 2002/96/EC
This instrument complies with the WEEE Directive (2002/96/EC) marking
requirement. This affixed product label indicates that you must not discard this
electrical or 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 as shown below.
Do not dispose in domestic household waste.
To return this unwanted instrument, contact your nearest Keysight Service Center,
or visit http://about.keysight.com/en/companyinfo/environment/takeback.shtml
for more information.
Sales and Technical Support
To contact Keysight for sales and technical support, refer to the support links on
the following Keysight websites:
– www.keysight.com/find/u1230dmm
(product-specific information and support, software and
documentation updates)
– www.keysight.com/find/assist
(worldwide contact information for repair and service)
10 Keysight U1231A, U1232A, and U1233A Service Guide
Table of Contents
Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Measurement Category . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Environmental Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Regulatory Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Waste Electrical and Electronic Equipment (WEEE) Directive
2002/96/EC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Product Category: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Sales and Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
1 Calibration Procedures
Keysight Calibration Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Closed case calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Calibration interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Other recommendations for calibration . . . . . . . . . . . . . . . . . . . . . .19
Recommended Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Basic Operating Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Backlight test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Display test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Calibration Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Test Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Performance Verification Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Calibration Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Unsecuring the Instrument for Calibration . . . . . . . . . . . . . . . . . . . . . .29
To unsecure the instrument from the front panel . . . . . . . . . . . . . . .29
To change the calibration security code . . . . . . . . . . . . . . . . . . . . . .31
To reset the calibration security code to its factory default . . . . . . .32
Using the Front Panel for Adjustments . . . . . . . . . . . . . . . . . . . . . . . . .34
Adjustment considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Adjustment procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Keysight U1231A, U1232A, and U1233A Service Guide 11
Valid adjustment input values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Functional tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Exiting the adjustment mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Calibration Count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Calibration Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
2Service and Maintenance
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Checking the Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Fuse Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Returning the Instrument for Service . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
To order replaceable parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Types of Service Available . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Extended service contracts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Obtaining Repair Service (Worldwide) . . . . . . . . . . . . . . . . . . . . . . . . . . 54
12 Keysight U1231A, U1232A, and U1233A Service Guide
List of Figures
Figure 1-1 LCD display screen . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Figure 1-2 SECU display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Figure 1-3 Calibration security code display . . . . . . . . . . . . . . . . .29
Figure 1-4 Calibration security code operation . . . . . . . . . . . . . . .30
Figure 1-5 CSEC display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Figure 1-6 Factory default calibration security code display . . . .31
Figure 1-7 SErn display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Figure 1-8 Calibration security code display . . . . . . . . . . . . . . . . .32
Figure 1-9 Calibration reference value display . . . . . . . . . . . . . . .35
Figure 1-10 Vsense functional test . . . . . . . . . . . . . . . . . . . . . . . . .41
Figure 2-1 Testing the fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
Figure 2-2 Replacing the fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
Keysight U1231A, U1232A, and U1233A Service Guide 13
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14 Keysight U1231A, U1232A, and U1233A Service Guide
List of Tables
Table 1-1 Recommended test equipment . . . . . . . . . . . . . . . . . . 20
Table 1-2 Performance verification tests . . . . . . . . . . . . . . . . . . .24
Table 1-3 Adjustment input values . . . . . . . . . . . . . . . . . . . . . . .37
Table 1-4 Calibration error codes . . . . . . . . . . . . . . . . . . . . . . . . . 44
Table 2-1 Operating checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Table 2-2 Fuse displayed readings . . . . . . . . . . . . . . . . . . . . . . . . 47
Keysight U1231A, U1232A, and U1233A Service Guide 15
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16 Keysight U1231A, U1232A, and U1233A Service Guide
Keysight U1231A, U1232A, and U1233A Handheld Digital Multimeter
Service Guide
1 Calibration Procedures
Keysight Calibration Services 18
Recommended Test Equipment 20
Basic Operating Test 21
Calibration Process 22
Test Considerations 23
Performance Verification Tests 24
Calibration Security 28
Unsecuring the Instrument for Calibration 29
Using the Front Panel for Adjustments 34
Calibration Count 43
Calibration Error Codes 44
This chapter contains procedures for verifying the instrument performance, as
well as procedures for making adjustments (calibration) where necessary.
17
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