Agilent Technologies U2741A User manual

Agilent Technologies
Agilent U2741A USB
Modular 5.5 Digits
Digital Multimeter
Service Guide

II U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide
Notices
® Agilent Technologies, Inc. , 2008
No part of this manual may be reproduced in
any form or by any means (including elec-
tronic storage and retrieval or translation
into a foreign language) without prior agree-
ment and written consent from Agilent
Technologies, Inc. as governed by United
States and international copyright laws.
Manual Part Number
U2741-90012
Edition
First Edition, July 31, 2008
Agilent Technologies, Inc.
3501 Stevens Creek Blvd.
Santa Clara, CA 95052 USA
Warranty
The material contained in this docu-
ment is provided “as is,” and is sub-
ject to being changed, without notice,
in future editions. Further, to the max-
imum extent permitted by applicable
law, Agilent 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 par-
ticular purpose. Agilent shall not be
liable for errors or for incidental or
consequential damages in connec-
tion with the furnishing, use, or per-
formance of this document or of any
information contained herein. Should
Agilent 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 sep-
arate agreement shall control.
Technology Licenses
The hardware and/or software described in
this document are furnished under a license
and may be used or copied only in accor-
dance with the terms of such license.
Restricted Rights Legend
U.S. Government Restricted Rights. Soft-
ware and technical data rights granted to
the federal government include only those
rights customarily provided to end user cus-
tomers. Agilent provides this customary
commercial license in Software and techni-
cal 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 Com-
puter Software Documentation).
Safety Notices
CAUTION
A CAUTION notice denotes a haz-
ard. It calls attention to an operat-
ing 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.
WARNING
A WARNING notice denotes a
hazard. It calls attention to an
operating procedure, practice, or
the like that, if not correctly per-
formed or adhered to, could result
in personal injury or death. Do not
proceed beyond a WARNING
notice until the indicated condi-
tions are fully understood and
met.
Trademark Acknowledgements
Pentium is a U.S. registered trademark of
Intel Corporation.
Microsoft, Visual Studio, Windows, and MS
Windows are trademarks of Microsoft Cor-
poration in the United States and/or other
countries.

U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide III
Safety Symbols
The following symbols on the instrument and in the documentation
indicate precautions which must be taken to maintain safe operation of
the instrument.
Direct current (DC) Off (supply)
Alternating current (AC) On (supply)
Both direct and alternating current Caution, risk of electric shock
Three-phase alternating current Caution, risk of danger (refer to this manual
for specific Warning or Caution information)
Earth (ground) terminal Caution, hot surface
Protective conductor terminal Out position of a bi-stable push control
Frame or chassis terminal In position of a bi-stable push control
Equipotentiality
`
Category II 300 V overvoltage protection
Equipment protected throughout by
double insulation or reinforced
insulation
CAT II
300 V

IV U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide
General Safety Information
WARNING
• Do not use the device if it is damaged. Before you use the device,
inspect the casing. Look for cracks or missing plastic. Do not operate
the device around explosive gas, vapor, or dust.
• Always use the device with the cables provided.
• Observe all markings on the device before establishing any
connection.
• Turn off the device and application system power before connecting
to the I/O terminals.
• When servicing the device, use only the specified replacement parts.
• Do not operate the device with the cover removed or loosened.
• Use only the power adapter provided by the manufacturer to avoid
any unexpected hazards.
CAUTION
•If the device is used in a manner not specified by the manufacturer, the
device protection may be impaired.
•Always use dry cloth to clean the device. Do not use ethyl alcohol or
any other volatile liquid to clean the device.
•Do not permit any blockage of the ventilation holes of the device.

U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide V
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 this instrument.
Environmental conditions Requirements
Operating temperature 0 °C to 50 °C
Operating humidity 20% to 85% RH non-condensing
Storage temperature –20 °C to 70 °C
Storage humidity 5% to 90% RH non-condensing
CAUTION
The U2741A USB modular digital multimeter complies with the following
safety and EMC requirements.
•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 61326-2002/EN 61326:1997+A1:1998+A2:2001+A3:2003
•Canada: ICES-001:2004
•Australia/New Zealand: AS/NZS CISPR11:2004

VI U2741A USB Modular 5.5 Digits Digital Multimeter 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.

U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide VII
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/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 Agilent
Technologies, or visit:
www.agilent.com/environment/product
for more information.

VIII U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide

U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide IX
Contents
1 Specifications 1
Product Specifications 2
Frequency specifications 5
Temperature specifications 6
2 Performance Test Calibration 7
Calibration Overview 8
Closed - case electronic calibration 8
Agilent technologies calibration services 8
Calibration interval 9
Time required for calibration 9
Recommended Test Equipment 10
Self-Calibration 11
Test Considerations 12
Input connections 13
Performance Verification Tests Overview 14
Performance Verification Tests 16
Zero offset verification 16
Gain verification 18
AC voltage verification test 22
AC current verification test 23
Optional AC voltage performance verification test 24
Optional AC current performance verification test 25

X U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide
Contents
3Service27
Types of Service Available 28
Extended service contracts 28
Obtaining repair service (Worldwide) 28
Repackaging for Shipment 30
Cleaning 31
Electrostatic Discharge (ESD) Precautions 32
To Replace a Current Input Fuse 33
Troubleshooting the modular DMM 34
4ReplacementParts35
To Order Replaceable Parts 36
General Disassemble 37