Agilent Technologies U2741A Bedienungsanleitung

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

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