Agilent Technologies 34450A User manual

Agilent Technologies

Agilent 34450A

5½ Digit Multimeter

Service Guide

II 34450A Service Guide

Notices

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

34450-90029

Edition

Third Edition, August 30, 2013

Agilent Technologies, Inc.

5301, Stevens Creek Blvd.

Santa Clara, CA 95051 USA

Warranty

The material contained in this document is

provided “as is,” and is subject to change,

without notice, in future editions. Further,

to the maximum extent permitted by the

applicable law, Agilent disclaims all war-

ranties, either express or implied, with

regard to this manual and any information

contained herein, including but not limited

to the implied warranties of merchantabil-

ity and fitness for a particular purpose.

Agilent 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 Agi-

lent 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.

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 likes

of that, if not correctly performed

or adhered to, could result in dam-

age to the product or loss of impor-

tant 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 likes of that, if not correctly

performed or adhered to, could

result in personal injury or death.

Do not proceed beyond a WARN-

ING notice until the indicated

conditions are fully understood

and met.

34450A Service Guide III

Safety Symbols

The following symbols on the instrument and in the documentation

indicate precautions that must be taken to maintain safe operation of the

instrument.

Earth (ground) terminal

Caution, risk of electric shock

Frame or chassis terminal

Caution, risk of danger (refer to this

manual for specific Warning or Caution

information)

IEC Measurement Category II. Inputs

may be connected to mains (up to

300 VAC) under Category II overvoltage

conditions.

CAT II

300 V

IV 34450A 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.

34450A 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. Agilent Technologies assumes no liability for the

customer’s failure to comply with these requirements.

VI 34450A Service Guide

Protection Limits

The Agilent 34450A 5½ Digital Multimeter

provides protection circuitry to prevent

damage to the instrument and to protect

against the danger of electric shock, pro-

vided that the Protection Limits are not

exceeded. To ensure safe operation of the

instrument, do not exceed the Protection

Limits shown on the front panel, as defined

below:

Note: The front-panel terminals and current

protection fuse are shown above.

Input Terminal Protection

Limits

Protection Limits are defined for the input

terminals:

Main Input (HI and LO) Terminals. The HI

and LO input terminals are used for voltage,

resistance, capacitance, and diode test

measurements. Two Protection Limits are

defined for these terminals:

HI to LO Protection Limit. The Protection

Limit from HI to LO ("A" in the figure

above) is 1000 VDC or 750 VAC, which is

also the maximum voltage measurement.

This limit can also be expressed as

1000 Vpk maximum.

LO to Ground Protection Limit. The LO

input terminal can safely "float" a maxi-

mum of 500 Vpk relative to ground. This is

Protection Limit "B" in the figure.

Although not shown on the figure, the Pro-

tection Limit for the HI terminal is a maxi-

mum of 1000 Vpk relative to the ground.

Therefore, the sum of the “float” voltage

and the measured voltage must not exceed

1000 Vpk

Current Input Terminal. The current input

("I") terminal has a Protection Limit of

100 mA (rms) maximum current flowing

from the LO input terminal. This is Protec-

tion Limit "C" in the figure. Note that the

current input terminal will be at approxi-

mately the same voltage as the LO terminal.

Note: The current-protection circuitry

includes a fuse on the back panel. To main-

tain protection, replace this fuse only with a

fuse of the specified type and rating.

10 A Current Input Terminal. The 10 A cur-

rent input terminal has a Protection Limit of

10 A (rms) maximum current flowing from

the LO input terminal. This is Protection

Limit "D" in the figure. Note that the current

input terminal will be at approximately the

same voltage as the LO terminal.

Note: The current-protection circuitry

includes an internal fuse. To maintain pro-

tection, service-trained personnel should

replace this fuse only with a fuse of the

specified type and rating.

Sense Terminal Protection

Limits

The HI and LO sense terminals are used

only for four-wire resistance measurements

(" Ω 4W"). The Protection Limit is 200 Vpk

for all of the terminal pairings ("E" in the fig-

ure):

LO sense to LO input.

HI sense to LO input.

HI sense to LO sense.

Note: The 200 Vpk limit on the sense termi-

nals is the Protection Limit. Operational

voltages in resistance measurements are-

much lower - less than 5 V in normal opera-

tion.

IEC Measurement Category II

Overvoltage Protection

To protect against the danger of electric

shock, the Agilent 34450A 5½ Digital Multi-

meter provides overvoltage protection for

line-voltage mains connections meeting

both of the following conditions:

The HI and LO input terminals are con-

nected to the mains under Measurement

Category II conditions, defined below, and

The mains are limited to a maximum line

voltage of 300 VAC.

IEC Measurement Category II includes elec-

trical devices connected to mains at an out-

let on a branch circuit. Such devices include

most small appliances, test equipment, and

other devices that plug into a branch outlet

or socket. The 34450A may be used to make

measurements with the HI and LO inputs

connected to mains in such devices, or to

the branch outlet itself (up to 300 VAC).

However, the 34450A may not be used with

its HI and LO inputs connected to mains in

permanently installed electrical devices

such as the main circuit-breaker panel,

sub-panel disconnect boxes, or permanently

wired motors. Such devices and circuits are

subject to overvoltages that may exceed the

protection limits of the 34450A.

Note: Voltages above 300 VAC may be mea-

sured only in circuits that are isolated from

mains. However, transient overvoltages are

also present on circuits that are isolated

from mains. The 34450A is designed to

safely withstand occasional transient over-

voltages up to 2500 Vpk. Do not use this

multimeter to measure circuits where tran-

sient overvoltages could exceed this level.

A

C

D

B

E

34450A Service Guide VII

WARNING

• Do not defeat the power cord safety ground feature. Plug in to a grounded

(earthed) outlet.

• Do not use the instrument in any manner that is not specified by the

manufacturer.

• To avoid electric shock or injury, do not operate the multimeter without panels or

case in place.

• Do not substitute parts or modify the instrument to avoid the danger of

introducing additional hazards. Return the instrument to Agilent Technologies

Sales and Service Office for service and repair to ensure the safety features are

maintained.

• Main Power and Test Input Disconnect: Unplug the instrument from the wall

outlet, remove the power cord, and remove all probes from all terminals before

servicing. Only qualified, service-trained personnel should remove the cover from

the instrument.

• Line and Current Protection Fuses: For continued protection against fire, replace

the line fuse and the current-protection fuse only with fuses of the specified type

and rating.

• IEC Measurement Category II. The HI and LO input terminals may be connected to

mains in IEC Category II installations for line voltages up to 300 VAC. To avoid the

danger of electric shock, do not connect the inputs to mains for line voltages

above 300 VAC. See “IEC Measurement Category II Overvoltage Protection” on

the following page for further information.

• Protection limits: To avoid instrument damage and the risk of electric shock, do

not exceed any of the Protection Limits defined in the following section.

• If the Test Lead Set is used in a manner not specified by Agilent Technologies, the

protection provided by the Test Lead Set may be impaired. Also, do not use a

damaged or worn Test Lead Set. Instrument damage or personal injury may

result.

VIII 34450A Service Guide

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.

Environmental Condition Requirement

Operating temperature Full accuracy at 0 °C to 55 °C

Operating humidity Full accuracy up to 80% RH at 30 °C

(non-condensing)

Storage temperature –40 °C to 70 °C

Altitude Operating up to 3,000 meters

Pollution degree Pollution Degree 2

NOTE

The Agilent 34450A 5½ Digit Multimeter complies with the following EMC and

safety requirements:

• IEC 61010-1:2001 / EN 61010-1:2001 (2nd Edition)

• IEC 61326-2-1:2005 / EN61326-2-1:2006

• CISPR 11:2003 / EN 55011:2007 Group 1 Class A

• Canada: ICES/NMB-001:Issue 4, June 2006

• Australia/New Zealand: AS/NZS CISPR 11:2004

CAUTION

Degradation of some product specifications can occur in the presence of ambient

electromagnetic (EM) fields and noise that are coupled to the power line or I/O

cables of the instrument. The instrument will self-recover and operate to all

specifications when the source of ambient EM field and noise are removed or when

the instrument is protected from the ambient EM field or when the instrument

cabling is shielded from the ambient EM noise.

34450A Service Guide IX

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 shown as below:

Do not dispose in domestic household waste

To return this unwanted instrument, contact your nearest Agilent office, or

visit www.agilent.com/environment/product for more information.

X34450A Service Guide

Additional Notices

The Agilent 34450A is provided with an Agilent 34138A Test Lead Set,

described below.

Test Lead Ratings

Test Leads - 1000 V, 15 A

Fine Tip Probe Attachments - 300 V, 3 A

Mini Grabber Attachment - 300 V, 3 A

SMT Grabber Attachments - 300 V, 3 A

Operation

The Fine Tip, Mini Grabber, and SMT Grabber attachments plug onto the

probe end of the Test Leads.

Maintenance

If any portion of the Test Lead Set is worn or damaged, do not use. Replace

with a new Agilent 34138A Test Lead Set.

WARNING

If the Test Lead Set is used in a manner not specified by Agilent Technologies, the

protection provided by the Test Lead Set may be impaired. Also, do not use a

damaged or worn Test Lead Set. Instrument damage or personal injury may result.

34450A Service Guide XI

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.corporate.agilent.com/DoC/search.htm

NOTE

If you are unable to search for the respective DoC, please contact your

local Agilent representative.

XII 34450A Service Guide

THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.

34450A Service Guide XIII

Table of Contents

1 Performance Tests and Calibration

Calibration Overview 2

Closed-case calibration 2

Agilent Technologies calibration services 2

Calibration interval 3

Time required for calibration 3

Automating calibration procedures 3

Recommended Test Equipment 4

Test Considerations 5

Input connections 6

Performance Verification Tests Overview 7

Self test 7

Quick performance check 8

Performance Verification Tests 9

Zero offset verification 9

Gain verification 11

DC current gain verification test 12

Ohms gain verification test 14

Frequency gain verification test 16

AC voltage verification test 17

AC current verification test 19

Capacitance performance verification test 22

Calibration Security 23

Unsecuring the instrument for calibration 24

Calibration Process 26

Using the front panel for adjustments 27

Adjustments 29

XIV 34450A Service Guide

Zero adjustment 29

Gain adjustments 29

DC voltage gain adjustment procedure 30

DC current gain adjustments procedure 32

AC voltage gain adjustment procedure 33

AC current gain adjustment procedure 35

Ohms gain adjustment procedure 36

Capacitance gain adjustment procedure 38

Frequency gain adjustment procedure 39

Finishing the adjustments 39

Calibration Message 40

To read the calibration count 40

Calibration Errors 41

2 Disassembly and Repair

Operating Checklist 44

Types of Services Available 45

Repackaging for Shipment 46

Cleaning 46

To Replace the Power Line Fuse 47

To Replace a Current Input Fuse 48

To Verify your Device License 49

Self Test Errors 50

Electrostatic Discharge (ESD) Precautions 51

Mechanical Disassembly 52

Replaceable Parts 58

Rack Mounting 60

34450A Service Guide XV

List of Tables

Tab l e 1- 1 Recommended test equipment 4

Tab l e 1- 2 Zero offset verification test 10

Tab l e 1- 3 DC voltage gain verification test 12

Tab l e 1- 4 DC current gain verification test 13

Tab l e 1- 5 Ohms gain verification test 15

Tab l e 1- 6 Frequency gain verification test 16

Tab l e 1- 7 AC volts verification test 17

Tab l e 1- 8 AC current verification test 20

Tab l e 1- 9 Capacitance verification test 22

Tab l e 1- 1 0 Valid gain and frequency compensation input values 30

Tab l e 1- 1 1 DC voltage gain adjustment 31

Tab l e 1- 1 2 DC current gain adjustment 32

Tab l e 1- 1 3 AC voltage gain adjustment 34

Tab l e 1- 1 4 AC current gain adjustment 35

Tab l e 1- 1 5 Ohms gain adjustment 37

Tab l e 1- 1 6 Capacitance gain adjustment 38

Tab l e 1- 1 7 Frequency gain adjustment 39

Tab l e 2- 1 Self test error numbers 50

Tab l e 2- 2 Replaceable parts list 58

XVI 34450A Service Guide

THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.

1

Agilent 34450A 5½ Digit Multimeter

Service Guide

Agilent Technologies

1

Performance Tests and Calibration

Calibration Overview 2

Recommended Test Equipment 4

Test Considerations 5

Performance Verification Te sts O v e r v i e w 7

Performance Verification Tests 9

Calibration Security 23

Calibration Process 26

Adjustments 29

Calibration Message 40

Calibration Errors 41

This chapter contains performance test procedures and

calibration procedures. The performance test procedures

allow you to verify that the multimeter is operating within

its published specifications.

WARNING

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 you have read and

follow all test equipment safety instructions. Use only completely

electric insulated test lead sets with connectors which are out of

contact with test voltages.

1 Performance Tests and Calibration

Calibration Overview

234450A Service Guide

Calibration Overview

.

Closed-case calibration

The instrument features closed- case electronic calibration. No internal

mechanical adjustments are required. The instrument calculates

correction factors based upon the input reference value you set. The new

correction factors are stored in non- volatile memory until the next

calibration adjustment is performed. Non- volatile EEPROM calibration

memory does not change when power has been off or after a remote

interface reset.

Agilent Technologies calibration services

When your instrument is due for calibration, contact your local Agilent

Service Center for a low- cost re- calibration. The 34450A is supported on

automated calibration systems, which allow Agilent to provide this

service at competitive prices.

NOTE

Make sure you have read “Test Considerations” on page 5 before calibrating the

instrument.

Performance Tests and Calibration 1

Calibration Overview

34450A Service Guide 3

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. Agilent does not recommend extending

calibration intervals beyond two years for any application.

Time required for calibration

The 34450A can be automatically calibrated under computer control.

With computer control you can perform the complete calibration

procedure and performance verification tests in less than 60 minutes

once the instrument is warmed- up (see“Test Considerations” on page 5).

Refer to the 34450A Programmer’s Reference online help for more

information.

Automating calibration procedures

The adjustment procedures provided in this Service Guide demonstrate

front panel adjustment. You can automate the complete verification and

adjustment procedures outlined in this manual. You can program the

instrument configurations specified for each test over the remote

interface. You can then enter read back verification data into a test

program and compare the results to the appropriate test limit values.

The instrument calibration must be unsecured to perform a calibration.

1 Performance Tests and Calibration

Recommended Test Equipment

434450A Service Guide

Recommended Test Equipment

The test equipment recommended for the performance verification and

adjustment procedures is listed in Table 1- 1 below. If the exact

instrument is not available, substitute calibration standards of equivalent

accuracy.

A suggested alternate method would be to use the Agilent 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 1- 1 Recommended test equipment

Application Recommended Equipment Recommended Accuracy Requirements

Zero calibration Fluke 5520A or 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

Capacitance Fluke 5520A <1/5 instrument 1 year spec

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