Keysight Technologies 34921A Manuel utilisateur

Keysight 34921A-34925A

Low Frequency Multiplexer

Modules

User’s Guide

2 Keysight 34921A-34925A User’s Guide

Notices

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

Trademarks

Microsoft® and Windows® are U.S.

registered trademarks of Microsoft

Corporation.

Manual Part Number

34980-90021

Edition

Edition 3, July 1, 2019

Printed in:

Printed in Malaysia

Published by:

Keysight Technologies

Bayan Lepas Free Industrial Zone,

11900 Penang, Malaysia

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.

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

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.

WARNING

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.

Keysight 34921A-34925A User’s Guide 3

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.

Alternating current (AC) Caution, risk of electric shock

Frame or chassis (ground) terminal

Caution, risk of danger (refer to this

manual for specific Warning or Caution

information)

Standby supply. Unit is not completely

disconnected from ac mains when

switch is off

4 Keysight 34921A-34925A User’s Guide

Additional Safety Notices

The following general safety precautions must be observed during all phases of

operation of this instrument. Failure to comply with these precautions or with

specific warnings or instructions elsewhere in this manual violates safety

standards of design, manufacture, and intended use of the instrument. Keysight

Technologies assumes no liability of the customer’s failure to comply with the

requirements.

General

Do not use this products in any manner not specified by the manufacturer. The

protective features of this product may be impaired if it is used in a manner not

specified in the operation instructions.

Before Applying Power

Verify that all safety precautions are taken. Make all connections to the unit before

applying power.

Ground the Instrument

This product is provided with protective earth terminals. To minimize shock

hazard, the instrument must be connected to the ac power mains through a

grounded power cable, with the ground wire firmly connected to an electrical

ground (safety ground) at the power outlet. Any interruption of the protective

(grounding) conductor or disconnection of the protective earth terminal will cause

a potential shock hazard that could result in personal injury.

Do Not Operate in an Explosive Atmosphere

Do not operate the instrument in the presence of flammable gases or fumes.

Keysight 34921A-34925A User’s Guide 5

Do Not Remove the Instrument Cover

Only qualified, service-trained personal who are aware of the hazards involved

should remove instrument covers. Always disconnect the power cable and any

external circuits before removing the instrument cover.

Do Not Modify the Instrument

Do not install substitute parts or perform any unauthorized modification to the

product. Return the product to an Keysight Sales and Service Office for service

and repair to ensure that safety features are maintained.

In Case of Damage

Instruments that appear damaged or defective should be made inoperative and

secured against unintended operation until they can be repaired by qualified

service personnel.

6 Keysight 34921A-34925A User’s Guide

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/34980a

(product-specific information and support, software and

documentation updates)

–www.keysight.com/find/assist

(worldwide contact information for repair and service)

Keysight 34921A-34925A User’s Guide 7

Table of Contents

Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Additional Safety Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Before Applying Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Ground the Instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Do Not Operate in an Explosive Atmosphere . . . . . . . . . . . . . . . . . . .4

Do Not Remove the Instrument Cover . . . . . . . . . . . . . . . . . . . . . . . .5

Do Not Modify the Instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

In Case of Damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Waste Electrical and Electronic Equipment (WEEE) Directive 2002/96/

EC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Product category: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Sales and Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Low Frequency Multiplexer Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Multiplexer Module Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Measurement Functions for the Multiplexer Modules . . . . . . . . . . .10

Operating Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

SCPI Programming Examples for the Multiplexer Modules . . . . . . . . . .13

34921A 40-Channel Armature Multiplexer with Low Thermal Offset . .17

34921A Simplified Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

34921A D-Sub Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

34921T Terminal Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

34922A 70-Channel Armature Multiplexer . . . . . . . . . . . . . . . . . . . . . .24

34922A Simplified Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

34922A D-Sub Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

34922T Terminal Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

34923A 40/80-Channel Reed Multiplexer . . . . . . . . . . . . . . . . . . . . . . .31

Two-Wire Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

Four-Wire Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

One-Wire Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

34923A Simplified Schematic for Two- or Four-Wire Mode . . . . . .34

8 Keysight 34921A-34925A User’s Guide

34923A D-Sub Connectors for Two- or Four-Wire Mode . . . . . . . . 35

34923T-001 Terminal Block for Two-Wire or Four-Wire Mode . . . 37

34923A Simplified Schematic for One-Wire Mode . . . . . . . . . . . . . 39

34923A D-Sub Connectors for One-Wire Mode . . . . . . . . . . . . . . . 40

34923T-002 Terminal Block for One-Wire Mode . . . . . . . . . . . . . . 42

34924A 70-Channel Reed Multiplexer . . . . . . . . . . . . . . . . . . . . . . . 43

34924A Simplified Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

34924A D-Sub Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

34924T Terminal Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

34925A 40/80-Channel Optically-Isolated FET Multiplexer . . . . . . . . 51

Two-Wire Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Four-Wire Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

One-Wire Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Interlock Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Overvoltage Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

34925A Simplified Schematic for Two- or Four-Wire Mode . . . . . . 54

34925A D-Sub Connectors for Two- or Four-Wire Mode . . . . . . . . 55

34925T-001 Terminal Block for Two-Wire or Four-Wire Mode . . . 57

34925A Simplified Schematic for One-Wire Mode . . . . . . . . . . . . . 59

34925A D-Sub Connectors for One-Wired Mode . . . . . . . . . . . . . . 60

34925T-002 Terminal Block for One-Wire Mode . . . . . . . . . . . . . . 62

Keysight 34921A-34925A User’s Guide 9

Low Frequency Multiplexer Modules

This User’s Guide covers the following five plug-in modules for the Keysight

34980A Multifunction Switch/Measure Unit:

Multiplexer Module Capabilities

Each multiplexer (MUX) module features two banks of channels, providing broad

multiplexing and measurement capabilities. Briefly:

– You can connect a MUX to an external instrument, and/or switch multiple

analog signals to the internal DMM.

– With the 34921A, 34922A, 34923A, and the 34924A modules, you can close

more than one channel in each bank simultaneously (N:1 configuration).

– Since the 34925A module is protected with overvoltage circuitry, you can close

only one channel in each bank at one time (1:Nconfiguration).

– You can connect multiple MUXes to the built-in Analog Buses, which allow you

to scan as many as 560 2-wire (differential) channels or 640 1-wire

(single-ended) channels in one 34980A mainframe.

34921A 40-channel armature multiplexer w/low thermal offset

34922A 70-channel armature multiplexer

34923A 40/80-channel reed multiplexer

34924A 70-channel reed multiplexer

34925A 40-channel optically isolated FET multiplexer

10 Keysight 34921A-34925A User’s Guide

Measurement Functions for the Multiplexer Modules

The MUX modules support the DMM measurement functions shown in the

following table.

[a] Direct current measurements are allowed on channels 41 through 44 only (for all other channels, external shunts are required).

[b] Optional 34921T Terminal Block is required for thermocouple measurements with built-in internal reference junction.

[c] A fixed or external reference junction temperature is required for thermocouple measurement with this module.

[d] Impact of higher offset voltage specification (< 50 μV) must be taken into consideration.

[e] 1 kΩor higher range used unless 100Ωseries resistors are bypassed on module.

[f] 10 kΩor higher range used for loads over approximately 300Ωdue to series resistance of FET channels.

Measurement Function(s)

34921A

40-ch

Armature

Mux

34922A

70-ch

Armature

Mux

34923A

40-ch

Reed Mux

(2-Wire)

34923A

80-ch

Reed Mux

(1-Wire)

34924A

70-ch

Reed Mux)

34925A

40-ch

FETMux

(2-Wire)

34925A

80-ch

FETMux

(1-Wire)

Voltage, AC/DC Yes Yes Yes Yes Yes Yes Yes

Current, AC/DC Yes

[a]

No No No No No No

Frequency/Period Yes Yes Yes Yes Yes Yes Yes

Ohms 2-Wire Yes Yes Yes

[e]

Yes

[e]

Yes

[e]

Yes

[f]

Yes

[f]

Ohms 4-Wire Yes Yes Yes

[e]

No Yes

[e]

Yes

[f]

Thermocouple Yes

[b]

Yes

[c]

Yes

[c],[d]

Yes

[c],[d]

Yes

[c],[d]

Yes

[c]

Yes

[c]

RTD 2-Wire Yes Yes Yes

[e]

Yes

[e]

Yes

[e]

No No

RTD 4-Wire Yes Yes Yes

[e]

No Yes

[e]

Yes

[f]

Thermistor Yes Yes Yes

[e]

Yes

[e]

Yes

[e]

No No

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