Keysight 34921A, 34924A, 34925A, 34922A, 34923A User Manual

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User Guide

Keysight 34921A-34925A Low Frequency Multiplexer Modules

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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, Inc. as governed by United States and international copyright laws.

Manual Part Number

34980-90021

Edition

Second Edition, January 2016

Printed in

Malaysia

Published by

Keysight Technologies, Inc. 900 S. Taft Ave. Loveland, CO 80537 USA

Trademarks

PICMG®, Compact PCI® are registered trademarks of the PCI Industrial Computer Manufacturers Group.

AdvancedTCA trademarks of the PCI Industrial Computer Manufacturers Group.

PCI-SIG®, PCI Express®, and PCIe registered trademarks of PCI-SIG.

and ATCA are registered

are

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://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.

Keysight Technologies does not warrant third-party system-level (combination of chassis, controllers, modules, etc.) performance, safety, or regulatory compliance unless specifically stated.

Safety Information

A CAUTION denotes a hazard. It calls attention to an operating procedure or practice 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 denotes a hazard. It calls attention to an operating procedure or practice, 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.

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iii

Safety Information

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 operating instructions in the product manuals violates safety standards of design, manufacture, and intended use of the instrument. Keysight Technologies assumes no liability for the customer's failure to comply with these requirements.

General

Do not use this product in any manner not specified by the manufacturer. The protective features of this product must not be impaired if it is used in a manner specified in the operation instructions.

Before Applying Power

Verify that all safety precautions are taken. Make all connections to the unit before applying power. Note the external markings described under “Safety Symbols”.

Ground the Instrument

Keysight chassis’ are provided with a grounding-type power plug. The instrument chassis and cover must be connected to an electrical ground to minimize shock hazard. The ground pin must be firmly connected to an electrical ground (safety ground) terminal 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 module/chassis in the presence of flammable gases or fumes.

Do Not Operate Near Flammable Liquids

Do not operate the module/chassis in the presence of flammable liquids or near containers of such liquids.

Cleaning

Clean the outside of the Keysight module/chassis with a soft, lint-free, slightly dampened cloth. Do not use detergent or chemical solvents.

Do Not Remove Instrument Cover

Only qualified, service-trained personnel 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.

Keep away from live circuits

Operating personnel must not remove equipment covers or shields. Procedures involving the removal of covers and shields are for use by servicetrained personnel only. Under certain conditions, dangerous voltages may exist even with the equipment switched off. To avoid dangerous electrical shock, DO NOT perform procedures involving cover or shield removal unless you are qualified to do so.

DO NOT operate damaged equipment

Whenever it is possible that the safety protection features built into this product have been impaired, either through physical damage, excessive moisture, or any other reason, REMOVE POWER and do not use the product until safe operation can be verified by servicetrained personnel. If necessary, return the product to an Keysight Technologies Sales and Service Office for service and repair to ensure the safety features are maintained.

DO NOT block the primary disconnect

The primary disconnect device is the appliance connector/power cord when a chassis used by itself, but when installed into a rack or system the disconnect may be impaired and must be considered part of the installation.

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 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

Do NOT block vents and fan exhaust: To ensure adequate cooling and ventilation, leave a gap of at least 50mm (2") around vent holes on both sides of the chassis.

Do NOT operate with empty slots: To ensure proper cooling and avoid damaging equipment, fill each empty slot with an AXIe filler panel module.

Do NOT stack free-standing chassis: Stacked chassis should be rackmounted.

All modules are grounded through the chassis: During installation, tighten each module's retaining screws to secure the module to the chassis and to make the ground connection.

Operator is responsible to maintain safe operating conditions. To ensure safe operating conditions, modules should not be operated beyond the full temperature range specified in the Environmental and physical specification. Exceeding safe operating conditions can result in shorter lifespan, improper module performance and user safety issues. When the modules are in use and operation within the specified full temperature range is not maintained, module surface temperatures may exceed safe handling conditions which can cause discomfort or burns if touched. In the event of a module exceed ing the full temperature range, always allow the module to cool before touching or removing modules from the chassis.

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Safety Symbols

A CAUTION denotes a hazard. It calls attention to an operating procedure or practice, 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.

Products display the following symbols:

Warning, risk of electric shock

Refer to manual for additional safety information.

Earth Ground.

Chassis Ground.

Alternating Current (AC).

Standby Power. Unit is not completely disconnected from AC mains when switch is in standby.

Antistatic precautions should be taken.

The CSA mark is a registered trademark of the Canadian Standards Association and indicates compliance to the standards laid out by them. Refer to the product Declaration of Conformity for details.

Notice for European Community: This product complies with the relevant European legal Directives: EMC Directive (2004/108/EC) and Low Voltage Directive (2006/95/EC).

The Regulatory Compliance Mark (RCM) mark is a registered trademark. 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.

This symbol represents 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 this product.

South Korean Class A EMC Declaration. this equipment is Class A suitable for professional use and is for use in electromagnetic environments outside of the home.

Waste Electrical and

Electronic Equipment (WEEE) Directive 2002/96/EC

This product complies with the WEEE Directive (2002/96/EC) marking requirement. The affixed product label (see below) 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 product is classified as a “Monitoring and Control instrumentation” product.

Do not dispose in domestic household waste.

To return unwanted products, contact your local Keysight office for more information.

CAT I CAT II CAT III CAT IV

For localized Safety Warnings, Refer to Keysight Safety document (p/n 9320-6792).

IEC Measurement Category I, II, III, or IV

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Contents

1 Low Frequency Multiplexer Modules

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

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

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

SCPI Programming Examples for the Multiplexer Modules . . . . . . . . . . . . . . . 12

34921A 40-Channel Armature Multiplexer with Low Thermal Offset. . . . . . . . 15

34921A Simplified Schematic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

34921A D-Sub Connectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

34921T Terminal Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

34922A 70-Channel Armature Multiplexer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

34922A Simplified Schematic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

34922A D-Sub Connectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

34922T Terminal Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

34923A 40/80-Channel Reed Multiplexer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Two-Wire Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Four-Wire Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

One-Wire Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

34923A Simplified Schematic for Two- or Four-Wire Mode . . . . . . . . . . . . 31

34923A D-Sub Connectors for Two- or Four-Wire Mode . . . . . . . . . . . . . . 32

34923T-001 Terminal Block for Two-Wire or Four-Wire Mode . . . . . . . . . 34

34923A Simplified Schematic for One-Wire Mode . . . . . . . . . . . . . . . . . . . 35

34923A D-Sub Connectors for One-Wire Mode . . . . . . . . . . . . . . . . . . . . . 36

34923T-002 Terminal Block for One-Wire Mode . . . . . . . . . . . . . . . . . . . . 38

34924A 70-Channel Reed Multiplexer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

34924A Simplified Schematic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

34924A D-Sub Connectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

34924T Terminal Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

34925A 40/80-Channel Optically-Isolated FET Multiplexer . . . . . . . . . . . . . . 47

Two-Wire Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Four-Wire Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

One-Wire Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Interlock Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Overvoltage Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

34925A Simplified Schematic for Two- or Four-Wire Mode . . . . . . . . . . . . 50

34925A D-Sub Connectors for Two- or Four-Wire Mode . . . . . . . . . . . . . . 51

34925T-001 Terminal Block for Two-Wire or Four-Wire Mode . . . . . . . . . 53

Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide vii

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Index

34925A Simplified Schematic for One-Wire Mode . . . . . . . . . . . . . . . . . . . 54

34925A D-Sub Connectors for One-Wired Mode . . . . . . . . . . . . . . . . . . . . 55

34925T-002 Terminal Block for One-Wire Mode . . . . . . . . . . . . . . . . . . . . 57

viii Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide

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Low Frequency Multiplexer Modules

Low Frequency Multiplexer

Modules

This User’s Guide covers the following five plug-in modules for the Keysight 34980A Multifunction Switch/Measure Unit:

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

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:N configuration).

- 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.

Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide 9

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Low Frequency Multiplexer Modules

Measurement Functions for the Multiplexer Modules

The MUX modules support the DMM measurement functions shown in the following table.

Measurement

Function(s)

34922A

40-ch

Armature

Mux

34922A

70-ch

Armature

Mux

34923A

40-ch

Reed Mu

(2-Wire)

34923A

80-ch

Reed Mux

(1-Wire)

34924A

70-ch

Reed Mu

34925

40-ch

FETMux

34925A

80-ch

FETMux

(1-Wire)

(2-Wire)

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

Current, AC/DC Yes

No No No No No No

Frequency/Period Yes Yes Yes Yes Yes Yes Yes

Yes

3,4

Ohms 2-Wire Yes Yes Yes

Ohms 4-Wire Yes Yes Yes

Thermocouple Y

Yes

RTD 2-Wire Yes Yes Yes

RTD 4-Wire Yes Yes Yes

Thermistor Y

Direct current measurements are allowed on channels 41 through 44 only (for all other channels, external shunts are

required).

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

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

Impact of higher offset voltage specification (< 50 V) must be taken into consideration.

1 k or higher range used unless 100 series resistors are bypassed on module.

10 k or higher range used for loads over approximately 300 due to series resistance of FET channels.

es Yes Yes

Yes

No Yes

3,4

Yes

No Yes

Yes

3,4

Yes

No No

Yes

No No

Yes

10 Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide

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Low Frequency Multiplexer Modules

Operating Considerations

Current Ratin

See the Introduction to the Plug In Modules chapter of the 34980A Mainframe User’s Guide for detailed environmental operating conditions for the 34980A mainframe and its installed modules. That guidance sets maximum per channel current ratings at rated voltage for pollution degree 1 (dry) and pollution degree 2 (possible condensation) conditions, for all of the multiplexer modules.

Safety Interlock

The Analog Buses of the 34980A are capable of carrying 300V signals. The MUX modules have a hardware Safety Interlock feature that automatically opens the Analog Bus relays when the associated interlock pins on the D-sub connectors (faceplate) lose continuity. This prevents signals on the Analog Buses from being present on the D-sub connector pins. Optional terminal blocks available from Keysight automatically provide continuity for these interlock pins. If cables are used, you must provide continuity for the interlock pins in your DUT assembly. See the pinout information later in this guide for the location of interlock pins on each module.

The MUX modules have Analog Bus relays on each of their two banks. Therefore, the interlock pins are present on both the Bank 1 and Bank 2 D-sub connectors on the MUX modules.

Normally, if you attempt to connect to the Analog Buses without a terminal block or cable connected, an error is generated. The SYSTem:ABUS:INTerlock:SIMulate command allows you to temporarily disable errors generated by the Safety Interlock feature and enables the simulation mode. Although Safety Interlock errors are suppressed in this mode, the actual Analog Bus relays affected by the Safety Interlock are disabled as long as no terminal block or cable is connected to the module.

The Safety Interlock feature is implemented in hardware on the modules and cannot be circumvented. Regardless of whether the simulation mode is enabled or disabled, all Analog Bus connections are prohibited as long as no terminal block or properly-wired cable is connected to the module.

- The simulation mode applies to the entire mainframe and cannot be selectively used on individual modules.

- When the simulation mode is enabled, the Analog Bus relays will appear to close and open as directed. For example, no errors are generated if you close an Analog Bus relay from the front panel, remote interface, or Web Interface. However, remember that the Safety Interlock feature prevents the actual hardware state of the Analog Bus relays from being changed. When you connect a terminal block or cable to the module, the Analog Bus relays will be closed.

- The simulation setting is stored in volatile memory and will be lost when power is turned off. To re-enable the simulation mode after power has been off, you must send the command again.

Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide 11

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Low Frequency Multiplexer Modules SCPI Programming Examples for the Multiplexer Modules

SCPI Programming Examples for the Multiplexer Modules

The programming examples below provide you with SCPI command examples to use for actions specific to the MUX modules.

The slot and channel addressing scheme used in these examples follow the form sccc where s is the mainframe slot number (1 through 8) and ccc is the three-digit channel number. For information on specific MUX channel configurations, refer to the simplified schematics contained in each MUX section of this manual.

For complete information on the SCPI commands used to program the 34980A, with example programs, refer to the Keysight 34980A Programmer’s Reference contained on the 34980A Product Reference CD.

Opening and Closing Channels

Example - Closing and opening channels on the armature and reed MUX modules: This command closes the specified channels on a MUX module. If

any channel in a bank is defined to be part of the scan list, and a scan is occurring, attempting to close another channel (including Analog Bus channels) within the same bank will result in an error. Channel closures in the other bank are allowed as long as no channels are part of the scan list.

The following commands close and open channels 13 and 15 through 18 in slot

ROUTe:CLOSe (@3013,3015:3018) ROUTe:OPEN (@3013,3015:3018)

Example -Closing channels on the FET MUX module: The FET MUX module

supports a 1:N type closure, meaning that you can have only one channel per bank closed at a time. The following command closes then automatically opens each channel from 1-19 (Bank 1) in succession, leaving channel 20 closed. Then the command continues closing and opening channels 21 to 39 (Bank 2), then leaving channel 40 closed. At the end, only channels 20 and 40 will be closed, while all other channels will have been closed and then opened. In this process, a channel will open before the next channel in succession closes, making this a “break-before-make” series.

ROUTe:CLOSe (@3001:3040)

The following command opens the closed channel on Bank 1 of a FET MUX module in slot 3, and closes channel 15 on that bank.

ROUTe:CLOSe (@3015)

12 Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide

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Low Frequency Multiplexer Modules

Exampl -e - Closing and opening Analog Bus relays: The following command

connects the Analog Buses to Bank 1 (via the Analog Bus relays on Bank 1) for a module in slot 3.

ROUTe:CLOSe (@3911,3912,3913,3914) ROUTe:OPEN (@3911,3912,3913,3914)

The Analog Bus relays (numbered s911, s912, s913, etc.) on the MUX modules are ignored if they are included in a range of channels. An error will be generated if an Analog Bus relay is specified as the first or last channel in a range of channels. For example, the following command closes all valid channels between channel 30 (slot 1) and channel 5 (slot 2). In addition, this command closes Analog Bus relay 911 on the module in slot 1 (Bank 1). Note that although the specified range of channels includes the other Analog Bus relays, they are ignored and are not closed by this command.

ROUTe:CLOSe (@1030:2005,1911)

Example - Querying channels for open or close state: The following

command returns a 1 (true) or 0 (false) state of channel 036 for a module in slot 3.

ROUTe:CLOSe (@3036) ROUTe:CLOSe? (@3036) !Returns a 1 ROUTe:OPEN? (@3036) !Returns a 0

Making Measurements

Example - Making voltage measurements: The following command

configures channels 9 and 10 in slot 4 for DC voltage measurements, triggers the internal DMM to scan channels 9 and 10, and returns the reading. The 1 V range is selected with 1 mV resolution.

MEASure:VOLTage:DC? 1,0.001, (@4009,4010)

Example - Making voltage measurements using INITiate and FETCh?:

The following program segment shows how to use the INITiate command with the CONFigure and FETCh? commands. The ROUTe:SCAN command puts channels 3 and 8 (of a module in slot 1) into the scan list (and redefines the scan list). The INITiate command scans the specified channels, and then sends the readings to memory. The FETCh? command transfers the readings from memory to the user.

CONFigure:VOLTage:DC 10,0.003,(@1003,1008) ROUTe:SCAN (@1003,1008) INITiate FETCh?

Example - Making current measurements: The following command

configures channel 43 for a 34921A modules in slot 7 for dc current measurements, triggers the internal DMM to scan the channel, and then sends the reading to the output buffer of the 34980A. The default settings for range (autorange) and resolution (1 PLC) are used for the measurement.

MEASure:CURRent:DC? (@7043)

Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide 13

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Low Frequency Multiplexer Modules SCPI Programming Examples for the Multiplexer Modules

Configuring a Module

Example - Configuring a module for 2-wire or 1-wire mode: The following

command configures a MUX module in slot 4 for 1-wire mode. Because you can configure only the 34923A and 34925A MUX modules (and the 34933A matrix module) for either 2-wire or 1-wire mode, an error is generated if you send this command to a slot that does not contain one of those three modules. If you are using terminal blocks with these modules, be sure to use the corresponding 2-wire or 1-wire terminal block.

SYSTem:MODule:WIRE:MODE WIRE1,4

When using a command to configure the system, the new configuration does not take effect until you cycle power on the 34980A.

Example - Querying the system for module Identify: The following

command returns the identity of the module installed in slot 7.

SYSTem:CTYPe? 7

For the 34923A and the 34925A MUX modules, the query response may include a suffix to indicate a 1-wire configuration. For example, the response for the 34923A will be either "34923A" (differential mode) or "34923A-1W" (single-ended mode).

Querying and Clearing Cycle Count, and Resetting Modules

Example - Querying the cycle count for a relay: The following command

returns the cycle count on channel 7 and channel 16 for a MUX module in slot 1.

DIAGnostic:RELay:CYCLes? (@1007,1016)

The 34925A will return 0 for relay counts because the FET relays on that module are non-mechanical and have an undefined lifetime.

Example - Clearing the cycle count for a relay: The following command

resets the cycle count to zero on the channels 7 and 16 for a MUX module in slot

DIAGnostic:RELay:CYCLes:CLEar (@1007,1016)

Example - Resetting module(s) to power-on state: The following command

resets a module in slot 4 to its power-on state.

SYSTem:CPON 4

14 Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide

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Low Frequency Multiplexer Modules

34921A 40-Channel Armature Multiplexer with Low Thermal Offset

The 34921A 40-Channel Armature Multiplexer (40-Ch Arm MUX) is divided into two banks with 20 latching armature switches (channels 1-20 and 21-40) in each. This module also offers four additional fused relays (channels 41-44) for making AC and DC current measurements with the internal DMM with no external shunts needed. These current channels feature “make-before-break” connections to ensure continuous current flow when switching from one current channel to another. The current fuses are replaceable. Refer to the 34980A Service Guide for specific information about these fuses.

This module also contains nine armature Analog Bus relays (channels 911-914, 921-924, and 931), four on each bank that can connect the bank relays to the system Analog Buses and one that connects the current relays to the current input of the DMM. Through ABus1 and ABus2 you can connect any of the channels to the internal DMM for voltage or resistance measurements. Refer to the simplified schematic on page 17.

ABus1 consists of three wires that are used for current and voltage measurements. A separate current bus on ABus1 connects to the internal DMM current measurement input and this bus can be connected only to channels 41 through

44. The current channel low (L) signal path is common with the ABus1 low (L) signal path. You cannot measure current and voltage on ABus1 simultaneously.

Using program commands or the mainframe front panel, you can control each of the channel switches individually, and thus configure the 34921A module in these modes:

- two independent 20-channel 2-wire MUXes. This configuration requires neither using external wiring nor connecting through the internal Analog Buses.

- one 20-channel 4-wire MUX. This configuration requires neither using external wiring nor connecting through the internal Analog Buses. For 4-wire resistance measurements, the instrument automatically pairs channel n on Bank 1 (source) with channel n+20 on Bank 2 (sense) to provide these connections. Four-wire controls occur only when doing 4-wire measurement operations through the internal DMM, such as MEASure:FRESistance? or scanning a channel previously configured as 4-wire.

Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide 15

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Low Frequency Multiplexer Modules 34921A 40-Channel Armature Multiplexer with Low Thermal Offset

- one 40-channel 2-wire MUX. You must use external wiring or connect through the internal Analog Bus relays for this configuration. For example, closing Analog Bus channels 913 and 923 connects Bank 1 and Bank 2 through ABus3. Or, externally you can connect COM1 to COM2 to create this configuration.

Low thermal offset voltage makes the 34921A ideal for low-level signal switching. The 34921T optional terminal block provides a built-in thermocouple reference junction that helps minimize errors due to thermal offset when you measure thermocouples.

This module has capability to scan as many as 100 channels/second using the internal DMM. With the automatic “break-before-make” connection operation, you are assured that no two signals are connected to each other during a scan. When using the module in a non-scanning mode, you can close as many channels as you wish.

This module is safety interlock protected, which means whenever the D-sub connector end of the modules is exposed, the Analog Bus relays automatically open and disconnect from the Analog Bus. For more information, see “Safety

Interlock” on page 11 and “34921A D-Sub Connectors” on page 18.

When power is off, all channel relays maintain state, and the Analog Bus relays open.

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Low Frequency Multiplexer Modules

The three-digit number assigned to each switch represents the channel number.

Bank Relays: Armature latching; Analog Bus Relays: Armature non-latching

026

027

028

029

030

ABus 2

DMM

(SENS)

ABus 3

ABus4

931

923

913 914

924

922

912911

921

DMM

(MEAS)

001

002

003

004

005

006

007

008

009

010

011

012

013

014

015

016

017

018

019

020

021

022

023

024

025

031

032

033

034

035

036

037

038

039

040

Current

Fuse

042

043

041

LHLH

044

COM 2

Bank 2

Current

Bank 1

COM 1

Analog Buses

ABus 1

34921A Simplified Schematic

This drawing shows two independent 20-channel 2-wire MUXes.

Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide 17

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Low Frequency Multiplexer Modules 34921A 40-Channel Armature Multiplexer with Low Thermal Offset

For orientation, the D-sub connector end of the module is

Bank 2

Bank 1

17L

36 37

39 40

43 44 45

47 48 49

19 20

21 22

25 26

27 28

29 30 31 32

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

TSIL* 11H 11L 7H 7L 17H 13H 13L 9H 9L 19H 19L 15H 15L Int erlock 1

Interlock11H 1L 2H 2L 3H 3L

COM1HCOM

4H 4L 14H 14L 5H 5L 20H 20L

18HGND 6H 6L 16H 16L 12H 12L 8H 8L 18L 10H 10L

AMP

41L

AMP

41I

AMP

42L

AMP

42I

*TSIL = Temperature Sensor Interface Line. Provides thermocouple reference sensor serial output line to the mainframe processor.

50-Pin D-Sub Male Connector

34921A D-Sub Connectors

Bank1

Desc Pin Desc Pin Desc Pin Desc Pin Desc Pin

1H 1 6H 35 11H 19 16H 37 COM1 H 7

1L 2 6L 36 11L 20 16L 38 COM1 L 8

2H 3 7H 21 12H 39 17H 23 Interlock 1 17

2L 4 7L 22 12L 40 17L 24 Interlock 1 33

3H 5 8H 41 13H 25 18H 43 GND 34

3L 6 8L 42 13L 26 18L 44 TSIL* 18

4H 9 9H 27 14H 11 19H 29 AMP 41L 47

4L 10 9L 28 14L 12 19L 30 AMP 41I 48

5H 13 10H 45 15H 31 20H 15 AMP 42L 49

5L 14 10L 46 15L 32 20L 16 AMP 42I 50

As a safety feature, interlock 1 pins (17 and 33) on Bank 1 must be shorted to enable the Bank 1 Analog Bus relays to close. The optional 34921T terminal block shorts these pins for you. This feature protects inadvertent routing of high voltages from the Analog Bus to the D-sub connector of the module.

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Low Frequency Multiplexer Modules

For orientation, the D-sub connector end of the module is facing you.

Bank 1

Bank 2

34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

23L Interlock 221H 21L 22H 22L 23H

COM2HCOM

24H 24L 34H 34L 25H 25L 40H 40L

1234567891011121314151617

37LTSIL* 31H 31L 27H 27L 37H 33H 33L 29H 29L 39H 39L 35H 35L Interl ock 2

18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33

GND 26H 26L 36H 36L 32H 32L 28H 28L 38H 38L 30H 30L

AMP

43L

AMP

43I

AMP

44L

AMP

44I

50-Pin D-Sub Male Connector

Bank 2

Desc Pin Desc Pin Desc Pin Desc Pin Desc Pin

21H 1 26H 35 31H 19 36H 37 COM2 H 7

21L 2 26L 36 31L 20 36L 38 COM2 L 8

22H 3 27H 21 32H 39 37H 23 Interlock 217

22L 4 27L 22 32L 40 37L 24 Interlock 233

23H 5 28H 41 33H 25 38H 43 GND 34

23L 6 28L 42 33L 26 38L 44 TSIL* 18

24H 9 29H 27 34H 11 39H 29 AMP 43L 47

24L 10 29L 28 34L 12 39L 30 AMP 43I 48

25H 13 30H 45 35H 31 40H 15 AMP 44L 49

25L 14 30L 46 35L 32 40L 16 AMP 44I 50

As a safety feature, interlock 2 pins (17 and 33) on Bank 2 must be shorted to enable the Bank 2 Analog Bus relays to close. The optional 34921T terminal block shorts these pins for you. This feature protects inadvertent routing of high voltages from the Analog Bus to the D-sub connector of the module.

Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide 19

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Low Frequency Multiplexer Modules 34921A 40-Channel Armature Multiplexer with Low Thermal Offset

Temperatur

34921T (viewed from bottom side)

External Reference

34921T Terminal Block

This terminal block with screw-type connections is labeled with the model number and the abbreviated module name. In addition, space is available on the label for you to write the slot number.

All modules that connect to the internal DMM are interlock protected. This means that when an installed module is exposed (no terminal block or cable is connected), the Analog Bus relays are open and disconnected from the Analog Buses. See “Safety Interlock” on page 11 for further information.

The 34921T is the only terminal block that provides an isothermal block with temperature reference for thermocouple measurements. The temperature sensor is located on the bottom side of the PC board as shown below. Also shown are two holes that you can use for connecting an external temperature reference to the terminal block.

When wiring the terminal block via cables to the mainframe, make sure the cables are connected to the correct connector. The cables provide communication and power to the temperature sensor on the 34921T terminal block. If cabling is not correct, an error may occur indicating that the 34921A module is not fully operational.

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Low Frequency Multiplexer Modules

The 34980A Product Reference CD (shipped with the instrument) contains a 34921T Wiring Log for you to document your wiring configuration for this module. You can open the wiring log file in Microsoft® Excel® or Adobe® Acrobat® format.

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Low Frequency Multiplexer Modules 34922A 70-Channel Armature Multiplexer

34922A 70-Channel Armature Multiplexer

The high-density 34922A 70-Channel Armature Multiplexer (70-Ch Arm MUX) is divided into two banks with 35 latching armature switches (channels 1-35 and 36-70) in each. This module also contains eight armature Analog Bus relays (channels 911-914 and 921-924), four on each bank that can connect the bank relays to the system Analog Buses. Through ABus1 and ABus2 you can connect any of the channels to the internal DMM for voltage or resistance measurements. Refer to the simplified schematic on page 23.

Using program commands or the mainframe front panel, you can control each of the channel switches individually, and thus configure the 34922A in these modes:

- two independent 35-channel 2-wire MUXes. This configuration requires

neither using external wiring nor connecting through the internal Analog Buses.

- one 35-channel 4-wire MUX. This configuration requires neither using

external wiring nor connecting through the internal Analog Buses. For 4-wire resistance measurements, the instrument automatically pairs channel n on Bank 1 (source) with channel n+35 on Bank 2 (sense) to provide these connections. Four-wire controls occur only when doing 4-wire measurement operations through the internal DMM, such as MEASure:FRESistance? or scanning a channel previously configured as 4-wire.

- one 70-channel 2-wire MUX. You must use external wiring or connect through

the internal Analog Bus relays for this configuration. For example, closing Analog Bus channels 913 and 923 connects Bank 1 and Bank 2 through ABus3. Or, externally you can connect COM1 to COM2 to create this configuration.

This module is interlock protected, which means whenever the D-sub connector end of the modules is exposed, the Analog Bus relays automatically open and disconnect from the Analog Bus. For more information, see “Safety Interlock” on page 11 and “34922A D-Sub Connectors” on page 24.

When the power is off, all channel relays maintain state, and the Analog Bus relays open.

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Low Frequency Multiplexer Modules

ABus2 DMM (SENS)

ABus3 ABus4

ABus1 DMM (MEAS)

001

002

003

004

005

006

007

015

016

017

018

019

020

021

022

023

024

025

026

027

028

029

030

031

032

033

034

035

008

009

010

011

012

013

014

036

037

038

039

040

041

042

043

044

045

046

047

048

049

050

051

052

053

054

055

056

057

058

059

060

061

062

063

064

065

066

067

068

069

070

911

924

914913

923

912

921 922

LHLHLHLH

LHLH

Bank 1

Bank 2

COM 1

COM 2

Analog Buses

The three-digit number assigned to each switch represents the channel number.

Bank Relays: Armature latching; Analog Bus Relays: Armature non-latching

34922A Simplified Schematic

This drawing shows two independent 35-channel 2-wire MUXes.

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Low Frequency Multiplexer Modules 34922A 70-Channel Armature Multiplexer

For orientation, the D-sub connector end of the module is facing you.

Bank 2

Bank 1

10H6H 6L 1H 1L 7H 7L

COM

1L 3H 3L 9H 9L 4H 4L

COM

1H2H 2L 10L 5L5H

1 2 3 4 5 6 7 8 9 1011121314151617

12H16H 16L 11H 11L 17H 17L 12L 8H 8L 34H 34L 19H 19L 14H 14L 20H 20L Interlock1

22 23

24 25

28 29

30 31

32 33 34 35

38 39

GND 26H 26L 21H 21L 22H 22L 27H 27L 13H 13L 28H 28L 24H 24L 29H 29L 15H 15L Interlock 1

42 43

45 46

49 50 51

53 54 55

57 5958

61 62

63 64

67 68

69 70

71 72 73 74

77 78

GND 32H 32L 31H 31L 33H 33L 18H 18L 23H 23L 35H 35L 30H 30L 25H 25L

NC NC

78-Pin D-Sub Male Connector

34922A D-Sub Connectors

Bank 1

Desc Pin Desc Pin Desc Pin Desc Pin Desc Pin Desc Pin

1H 3 8H 29 15H 57 22H 45 29H 55 COM1 H 9

1L 4 8L 30 15L 58 22L 46 29L 56 COM1 L 10

2H 7 9H 13 16H 21 23H 69 30H 73 Interlock 1 39

2L 8 9L 14 16L 22 23L 70 30L 74 Interlock 1 59

3H 11 10H 17 17H 25 24H 53 31H 63 GND 40

3L 12 10L 18 17L 26 24L 54 31L 64 GND 60

4H 15 11H 23 18H 67 25H 75 32H 61 No

Connect

4L 16 11L 24 18L 68 25L 76 32L 62 No

Connect

5H 19 12H 27 19H 33 26H 41 33H 65

5L 20 12L 28 19L 34 26L 42 33L 66

6H 1 13H 49 20H 37 27H 47 34H 31

6L 2 13L 50 20L 38 27L 48 34L 32

7H 5 14H 35 21H 43 28H 51 35H 71

7L 6 14L 36 21L 44 28L 52 35L 72

As a safety feature, interlock 1 pins (39 and 59) on Bank 1 must be shorted to enable the Bank 1 Analog Bus relays to close. The optional 34922T terminal blocks short these pins for you. This feature protects inadvertent routing of high voltages from the Analog Buses to the D-sub connector of the module.

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Low Frequency Multiplexer Modules

For orientation, the D-sub connector end of the module is facing you.

Bank 2

Bank 1

45H41H 41L 36H 36L 42H 42L

COM

2L 38H 38L 44H 44L 39H 39L

COM

2H37H 37L 45L 40L40H

1 2 3 4 5 6 7 8 9 1011121314151617

47H51H 51L 46H 46L 52H 52L 47L 43H 43L 69H 69L 54H 54L 49H 49L 55H 55L Interlock 2

22 23

24 25

28 29

30 31

32 33 34 35

38 39

GND 61H 61L 56H 56L 57H 57L 62H 62L 48H 48L 63H 63L 59H 59L 64H 64L 50H 50L Interlock 2

42 43

45 46

49 50 51

53 54 55

57 5958

61 62

63 64

67 68

69 70

71 72 73 74

77 78

GND 67H 67L 66H 66L 68H 68L 53H 53L 58H 58L 70H 70L 65H 65L 60H 60L

NC NC

78-Pin D-Sub Male Connector

Bank 2

Desc Pin Desc Pin Desc Pin Desc Pin Desc Pin Desc Pin

36H 3 43H 29 50H 57 57H 45 64H 55 COM2 H 9

36L 4 43L 30 50L 58 57L 46 64L 56 COM2 L 10

37H 7 44H 13 51H 21 58H 69 65H 73 Interlock 2 39

37L 8 44L 14 51L 22 58L 70 65L 74 Interlock 2 59

38H 11 45H 17 52H 25 59H 53 66H 63 GND 40

38L 12 45L 18 52L 26 59L 54 66L 64 GND 60

39H 15 46H 23 53H 67 60H 75 67H 61 No

Connect

39L 16 46L 24 53L 68 60L 76 67L 62 No

Connect

40H 19 47H 27 54H 33 61H 41 68H 65

40L 20 47L 28 54L 34 61L 42 68L 66

41H 1 48H 49 55H 37 62H 47 69H 31

41L 2 48L 50 55L 38 62L 48 69L 32

42H 5 49H 35 56H 43 63H 51 70H 71

42L 6 49L 36 56L 44 63L 52 70L 72

As a safety feature, interlock 2 pins (39 and 59) on Bank 2 must be shorted to enable the Bank 2 Analog Bus relays to close. the optional 34922T terminal blocks short these pins for you. This feature protects inadvertent routing of high voltages from the Analog Buses to the D-sub connector of the module.

Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide 25

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Low Frequency Multiplexer Modules 34922A 70-Channel Armature Multiplexer

34922T Terminal Blocks

Two terminal blocks are available to facilitate wiring connections to the 34922A module:

34922T-001 (Option 001) Terminal block with solder connectors

34922T-002 (Option 002) Terminal block with screw connectors

The 34980A Product Reference CD (shipped with the instrument) contains a 34922T Wiring Log for you to document your wiring configuration for this module. You can open the wiring log file in Microsoft® Excel® or Adobe® Acrobat® format

34922T-001 Terminal Block

This terminal block with solder-type connections is labeled with the model number and the abbreviated module name. In addition, space is available on the label for you to write the slot number.

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Low Frequency Multiplexer Modules

B A N K

3 4 5 COM1

8 9 10 11

HLHLHLHLHLH

HLHLHLHL

HLHL

14 15 16

HLHLHLHL

HLHL

HLHLHLHLHLH

20 21 22 23

26 27 28

HLHLHLHL

HLHL

HLHLHLHLHLH

32 33 34 35

61 62 63 64

HLHLHLHLHLH

HLHLHLHL

HLHL

67 68 69

49 50 51 52

HLHLHLHLHLH

HLHLHLHL

HLHL

55 56 57

COM2

37 38 39

HLHLHLHL

HLHL

HLHLHLHLHLH

43 44 45 46

34922T-002 Terminal Block

This terminal block with screw-type connections is labeled with the model number and the abbreviated module name. In addition, space is available on the label for you to write the slot number.

W 2 2

Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide 27

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Low Frequency Multiplexer Modules 34923A 40/80-Channel Reed Multiplexer

34923A 40/80-Channel Reed Multiplexer

The 34923A 40/80-Channel Reed Multiplexer (40/80-Ch Reed MUX) is divided into two equal banks of non-latching reed switches. This module also contains eight armature Analog Bus relays (channels 911-914 and 921-924), four on each bank that can connect the bank relays to the system Analog Buses. You can connect any of the channels to the internal DMM through ABus1 and ABus2 for voltage or resistance measurements.

Using program commands or the mainframe front panel, you can control each of the channel switches individually, and configure this module for differential (2-wire or 4-wire) or single-ended (1-wire) mode. Refer to the simplified schematics on page 31 and page 35.

If you are using an Keysight 34923T-00x terminal block to connect your DUT to this module, be sure to use the terminal block that corresponds to your module configuration mode (Refer to the terminal block drawings on page 34 and

page 38.):

34923T-001 (Option 001 Terminal block for differential (two- or four-wire) mode

34923T-002 (Option 002) Terminal block for single-ended (1-wire) mode

You can confirm the mode in which your module is configured by using the SYSTem:CTYPe? <slot number> program command. This command returns the identity of the plug-in module in the specified slot.

Whenever you change from 2- or 4-wire mode to 1-wire mode, or the reverse, you must cycle power on the 34980A for the configuration to take effect.

In all modes, this module has capability to scan as many as 500 channels/second using the internal DMM. With the automatic “break-before-make” connection operation, you are assured that no two signals are connected to each other during a scan.

This module is interlock protected, which means whenever the D-sub connector end of the modules is exposed, the Analog Bus relays immediately open and disconnect from the Analog Bus. For more information, see “Safety Interlock” on page 11 and the D-Sub connector drawings on page 32 and page 36.

Because user-attached reactive loads and backplane parasitic capacitance may result in high in-rush currents, 100

in-rush resistors protect the reed relays from damage

and performance degradation. Therefore, you must consider these resistors when you are designing a measurement. Refer to the simplified schematics on page 31 and page 35.

Lifetime of relays is severely degraded as current or voltage goes up. If higher voltage is being switched, limits on source current are recommended.

When the power is off, all channel and Analog Bus relays open.

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Low Frequency Multiplexer Modules

Two-Wire Mode

You may configure the 34923A as:

- two independent 20-channel 2-wire MUXes. This configuration requires neither the use of external wiring nor connection through the internal Analog Buses.

- one 40-channel, 2-wire MUX. For this configuration, you must use external wiring or connect through the internal Analog Buses.

In 2-wire mode, you can close no more than 20 channels simultaneously due to power dissipation. Note that there are two 20 channel banks in 2-wire mode. Each 20 channel bank is further divided into two 10 channel sub-banks in the control circuitry. These 20 channels are split 10 to a bank. However, note that Analog Bus relays count half as much as channel relays in that total. For example, with one Analog Bus relay closed, you can close up to a maximum of 19 channel relays. If you try to close more than the allowed number of channels, you will receive an error message.

Four-Wire Mode

You may configure the 34923A as a 20-channel 4-wire MUX. This configuration requires neither external wiring nor connection through the Analog Buses.

For 4-wire resistance measurements, the instrument automatically pairs channel n on Bank 1 (source) with channel n+20 on Bank 2 (sense) to provide these connections. Four-wire controls occur only when doing 4-wire measurement operations through the internal DMM, such as MEASure:FRESistance? or scanning a channel previously configured as 4-wire.

One-Wire Mode

You may configure the 34923A as:

- two independent 40-channel 1-wire MUXes. This configuration requires neither external wiring nor connection through the internal Analog Buses.

- one 80-channel 1-wire MUX. You must use external wiring or connect through the internal Analog Bus for this configuration.

Because all bank relays supply only HI signals, you can apply a LOW signal through COM1 L or COM2 L when you are making 2-wire resistance measurements in 1-wire mode.

In 1-wire mode, you can close no more than 40 channels simultaneously due to power dissipation. Note that there are two 40 channel banks in 1-wire mode. Each 40 channel bank is further divided into two 20 channel sub-banks in the control circuitry. These channels are split 20 to a bank. For example, with one

Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide 29

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Low Frequency Multiplexer Modules 34923A 40/80-Channel Reed Multiplexer

Analog Bus relay closed you can close up to a maximum of 39 channel relays. If you try to close more than the allowed number of channels, you will receive an error message.

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Low Frequency Multiplexer Modules

The three-digit number assigned to each switch represents the channel number.

Bank Relays: Reed non-latching; Analog Bus Relays: Armature non-latching

026

027

028

029

030

031

032

033

034

035

036

037

038

039

040

021

022

023

024

025

001

002

003

004

005

006

007

008

009

010

011

012

013

014

015

016

017

018

019

020

ABus 2 DMM (SENS)

ABus3

ABus 4

923

913 914

924922

912911

921

ABus 1 DMM (MEAS)

HL HL HL H L

LHLHLHLH

HL H L

100 100

100

100 100

Bank 1

Bank 2

COM 1

COM 2

Analog Buses

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

This drawing shows two independent 20-channel 2-wire MUXes. To change configuration modes, use the SYSTem:MODule:WIRE:MODE command.

Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide 31

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Low Frequency Multiplexer Modules 34923A 40/80-Channel Reed Multiplexer

Bank 2

Bank 1

17L

19 20

21 22

25 26

27 28

29 30 31 32

Reserved 11H 11L 7H 7L 17H 13H 13L 9H 9L 19H 19L 15H 15L Interl ock 1

1 2 3 4 5 6 7 8 9 10111213141516 17

Interlock11H 1L 2H 2L 3H 3L

COM1HCOM

4H 4L 14H 14L 5H 5L 20H 20L

GND 6H 6L 16H 16L 12H 12L 8H 8L 18H 18L 10H 10L

Reserve d

36 37

39 40

43 44 45

47 48 49

50-Pin D-Sub Male Connector

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

Bank 1

For orientation, the D-sub connector end of the module is facing you.

Desc Pin Desc Pin Desc Pin Desc Pin Desc Pin

1H 1 6H 35 11H 19 16H 37 COM1 H 7

1L 2 6L 36 11L 20 16L 38 COM1 L 8

2H 3 7H 21 12H 39 17H 23 Interlock 1 17

2L 4 7L 22 12L 40 17L 24 Interlock 1 33

3H 5 8H 41 13H 25 18H 43 GND 34

3L 6 8L 42 13L 26 18L 44 Reserved 18

4H 9 9H 27 14H 11 19H 29 Reserved 47

4L 10 9L 28 14L 12 19L 30 Reserved 48

5H 13 10H 45 15H 31 20H 15 Reserved 49

5L 14 10L 46 15L 32 20L 16 Reserved 50

As a safety feature, interlock 1 pins (17 and 33) on Bank 1 must be shorted to enable the Bank 1 Analog Bus relays to close. The optional 34923T-001 (for 2-wire) terminal block shorts these pins for you. This feature protects inadvertent routing of high voltages from the Analog Bus to the D-sub connector of the module.

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Low Frequency Multiplexer Modules

Bank 1

Bank 2

37L

18 19

23 24 25 26 27 28 29 30 31 32 33

Reserved 31H 31L 27H 27L 37H 33H 33L 29H 29L 39H 39L 35H 35L Inter lock 2

1 2 3 4 5 6 7 8 9 101112131415 1617

23L Int erlock 221H 21L 22H 22L 23H

COM2HCOM

24H 24L 34H 34L 25H 25L 40H 40L

Reser ved

34 35 36 37 38 39 40 41 42 43 44 45 46

48 49 50

GND 26H 26L 36H 36L 32H 32L 28H 28L 38H 38L 30H 30L

50-Pin D-Sub Male Connector

For orientation, the D-sub connecto

end of the module is facing you.

Bank 2

Desc Pin Desc Pin Desc Pin Desc Pin Desc Pin

21H 1 26H 35 31H 19 36H 37 COM2 H 7

21L 2 26L 36 31L 20 36L 38 COM2 L 8

22H 3 27H 21 32H 39 37H 23 Interlock 217

22L 4 27L 22 32L 40 37L 24 Interlock 233

23H 5 28H 41 33H 25 38H 43 GND 34

23L 6 28L 42 33L 26 38L 44 Reserved 18

24H 9 29H 27 34H 11 39H 29 Reserved 47

24L 10 29L 28 34L 12 39L 30

25H 13 30H 45 35H 31 40H 15

25L 14 30L 46 35L 32 40L 16

Reserved

As a safety feature, interlock 2 pins (17 and 33) on Bank 2 must be shorted to enable the Bank 2 Analog Bus relays to close. The optional 34923T-001 (for 2-wire) shorts these pins for you. This feature protects inadvertent routing of high voltages from the Analog Buses to the D-sub connector of the module.

Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide 33

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Low Frequency Multiplexer Modules 34923A 40/80-Channel Reed Multiplexer

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

This terminal block with screw-type connections is labeled with the model number and the abbreviated module name. In addition, space is available on the label for you to write the slot number.

If you are using an Keysight terminal block to connect your DUT to this module be sure to use the 34923T-001 terminal block that corresponds to the 2- or 4-wire configuration mode. An error will not be generated if you have installed a terminal block that doesn't match the present module configuration.

The 34980A Product Reference CD (shipped with the instrument) contains a 34923T (2-wire mode) Wiring Log for you to document your wiring configuration for this module. You can open the wiring log file in Microsoft® Excel® or Adobe® Acrobat® format.

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The three-digit number assigned to each switch represents the channel number.

Bank Relays: Reed non-latching; Analog Bus Relays: Armature non-latching

ABus2 DMM (SENS)

ABus 3

ABus 4

ABus1 DMM (MEAS)

HH H H

021

022

023

024

025

026

027

028

029

030

011

012

013

014

015

016

017

018

019

020

031

032

033

034

035

036

037

038

039

040

001

002

003

004

005

006

007

008

009

010

911 912 913 914

921 922 923 924

HL H LHL

071

072

073

074

075

076

077

078

079

080

061

062

063

064

065

066

067

068

069

070

051

052

053

054

055

056

057

058

059

060

041

042

043

044

045

046

047

048

049

050

HL HL HL HL

100

100 100

100

Bank 1

Bank 2

COM 1

COM 2

Analog Buses

Low Frequency Multiplexer Modules

34923A Simplified Schematic for One-Wire Mode

This drawing shows two independent 40-channel 1-wire MUXes. To change configuration modes, use the SYSTem:MODule:WIRE:MODE command.

Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide 35

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Low Frequency Multiplexer Modules 34923A 40/80-Channel Reed Multiplexer

For orientation, the D-sub connector end of the module is facing you.

Bank 2

Bank 1

36 37

39 40

43 44 45

47 48 49

19 20

21 22

25 26

27 28

29 30 31 32

GND111231 3223 24151635361920

Reser ved

Reserved 21 22 13 14 33 25 26 17 18 37 38 29 30 Int erlock 1

1 2 3 4 5 6 7 8 9 1011121314151617

Interlock1123456

COM

7 8 27 28 9 10 39 40

50-Pin D-Sub Male Connector

34923A D-Sub Connectors for One-Wire Mode

Bank 1

Desc Pin Desc Pin Desc Pin Desc Pin Desc Pin

1 1 11 35 21 19 31 37 COM1 H 7

2 2 12 36 22 20 31 38 COM1 L 8

3 3 13 21 23 39 33 23 Interlock 117

4 4 14 22 24 40 34 24 Interlock 133

5 5 15 41 25 25 35 43 GND 34

6 6 16 42 26 26 36 44 Reserved 18

7 9 17 27 27 11 37 29 Reserved 47

8 10182828123830Reserved48

9 13194529313915Reserved49

10 14 20 46 30 32 40 16 Reserved 50

As a safety feature, interlock 1 pins (17 and 33) on Bank 1 must be shorted to enable the Bank 1 Analog Bus relays to close. The optional 34923T-002 (for 1-wire) shorts these pins for you. This feature protects inadvertent routing of high voltages from the Analog Bus to the D-sub connector of the module.

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Low Frequency Multiplexer Modules

For orientation, the D-sub connector end of the

module is facing you.

Bank 1

Bank 2

36 37

39 40

43 44 45

47 48 49

19 20

21 22

25 26

27 28

29 30 31 32

GND515271 7263 64555675765960

Reserved 61 62 53 54 73 65 66 57 58 77 78 69 70 Int erlock 2

1 2 3 4 5 6 7 8 9 1011121314151617

Interlock 241 42 43 44 45 46

COM2HCOM

47 48 67 68 49 50 79 80

Reser ved

50-Pin D-Sub Male Connector

Bank 2

Desc Pin Desc Pin Desc Pin Desc Pin Desc Pin

411513561197137COM2 H7

422523662207238COM2 L 8

433532163397323Interlock

444542264407424Interlock

455554165257543GND34

466564266267644Reserved 18

479572767117729Reserved47

48 10 58 28 68 12 78 30 Reserved 48

49 13 59 45 69 31 79 15 Reserved 49

50 14 60 46 70 32 80 16 Reserved 50

As a safety feature, interlock 2 pins (17 and 33) on Bank 2 must be shorted to enable the Bank 2 Analog Bus relays to close. The optional 34923T-002 (for 1-wire) shorts these pins for you. This feature protects inadvertent routing of high voltages from the Analog Buses to the D-sub connector of the module.

Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide 37

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Low Frequency Multiplexer Modules 34923A 40/80-Channel Reed Multiplexer

34923T-002 Terminal Block for One-Wire Mode

This terminal block with screw-type connections is labeled with the model number and the abbreviated module name. In addition, space is available on the label for you to write the slot number

If you are using an Keysight terminal block to connect your DUT to this module be sure to use the 34923T-002 terminal block that corresponds to the 1-wire configuration mode. An error will not be generated if you have installed a terminal block that doesn't match the present module configuration.

The 34980A Product Reference CD (shipped with the instrument) contains a 34923T (1-wire mode) Wiring Log for you to document your wiring configuration for this module. You can open the wiring log file in Microsoft® Excel® or Adobe® Acrobat® format.

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Low Frequency Multiplexer Modules

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Low Frequency Multiplexer Modules 34924A 70-Channel Reed Multiplexer

34924A 70-Channel Reed Multiplexer

The high-density 34924A 70-Channel Reed Multiplexer (70-Ch Reed MUX) is divided into two banks with 35 non-latching reed switches (channels 1-35 and 36-70) in each. This module also contains eight armature Analog Bus relays (channels 911-914 and 921-924), four on each bank that can connect the bank relays to the system Analog Buses. Through ABus1 and ABus2 you can connect any of the channels to the system DMM for voltage or resistance measurements. See the simplified schematic on page 42.

Using program commands or the mainframe front panel, you can control each of the channel switches individually, and thus configure the 34924A in any of these modes:

- two independent 35-channel 2-wire MUXes. This configuration requires neither using external wiring nor connecting through the internal Analog Buses.

- one 70-channel, 2-wire MUX. You must use external wiring or connect through the internal Analog Buses for this configuration.

- one 35-channel 4-wire MUX. This configuration requires neither using external wiring nor connecting through the internal Analog Buses. For 4-wire resistance measurements, the instrument automatically pairs channel n on Bank 1 (source) with channel n+35 on Bank 2 (sense) to provide these connections. Four-wire controls occur only when doing 4-wire measurement operations through the internal DMM, such as MEASure:FRESistance? or scanning a channel previously configured as 4-wire.

In 2-wire mode, you can close no more than 20 channels simultaneously due to power dissipation. These 20 channels are split 10 to a bank. However, note that Analog Bus relays count half as much as channel relays in that total. For example, with one Analog Bus relay closed, you can close up to a maximum of 19 channel relays. If you try to close more than the allowed number of channels, you will receive an error message.

Because user-attached reactive loads and backplane parasitic capacitance may result in high in-rush currents, 100

in-rush resistors protect the reed relays from damage

and performance degradation. Therefore, you must consider these resistors when you are designing a measurement. Refer to the simplified schematic on page 42.

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Low Frequency Multiplexer Modules

Lifetime of relays is severely degraded as current or voltage goes up. If higher voltage is being switched, limits on source current are recommended.

When the power is off, all channel and Analog Bus relays open.

Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide 41

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Low Frequency Multiplexer Modules 34924A 70-Channel Reed Multiplexer

The three-digit number assigned to each switch represents the channel number.

Bank relays: Reed non-latching; Analog Bus relays: Armature non-latching

ABus2 DMM (SENS)

ABus3 ABus4

ABus1 DMM (MEAS)

911 914912 913

924922 923921

001

002

003

004

005

006

015

016

017

018

019

020

021

022

023

024

025

026

027

028

029

030

031

032

033

034

008

009

010

011

012

013

007

035

014

036

037

038

039

040

041

042

043

044

045

046

047

048

049

050

051

052

053

054

055

056

063

064

065

066

067

068

069

070

057

058

059

060

061

062

LHLH

100

100 100

100

100 100

100

Bank 1

Bank 2

COM 2

COM 1

Analog Buses

34924A Simplified Schematic

This drawing shows two independent 35-channel 2-wire MUXes.

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Low Frequency Multiplexer Modules

For orientation, the D-sub connector end of the module is facing you.

Bank 2

Bank 1

10H6H 6L 1H 1L 7H 7L

COM

1L 3H 3L 9H 9L 4H 4L

COM

1H2H 2 L 10L 5L5H

1 2 3 4 5 6 7 8 9 101112131415 1617

12H16H 16H 11L 11H 17H 17L 12L 8H 8L 34H 34L 19H 19H 14H 14L 20H 20L Interlock1

22 23

24 25

28 29

30 31

32 33 34 35

38 39

GND 26H 26L 21H 21L 22H 22L 27H 27L 13H 13L 28H 28L 24L 24L 29H 29L 15H 15L Interloc k 1

45 46

49 50 51

53 54 55

57 5958

61 62

63 64

67 68

69 70

71 72 73 74

77 78

GND 32H 32L 31H 31L 33H 33L 18H 18L 23H 23L 35H 35L 30H 30L 25H 25L

NC NC

78-Pin D-Sub Male Connector

34924A D-Sub Connectors

Bank 1

Desc Pin Desc Pin Desc Pin Desc Pin Desc Pin Desc Pin

1H 3 8H 29 15H 57 22H 45 29H 55 COM1 H 9

1L 4 8L 30 15L 58 22L 46 29L 56 COM1 L 10

2H 7 9H 13 16H 21 23H 69 30H 73 Interlock 1 39

2L 8 9L 14 16L 22 23L 70 30L 74 Interlock 1 59

3H 11 10H 17 17H 25 24H 53 31H 63 GND 40

3L 12 10L 18 17L 26 24L 54 31L 64 GND 60

4H 15 11H 23 18H 67 25H 75 32H 61 No

Connect

4L 16 11L 24 18L 68 25L 76 32L 62 No

Connect

5H 19 12H 27 19H 33 26H 41 33H 65

5L 20 12L 28 19L 34 26L 42 33L 66

6H 1 13H 49 20H 37 27H 47 34H 31

6L 2 13L 50 20L 38 27L 48 34L 32

7H 5 14H 35 21H 43 28H 51 35H 71

7L 6 14L 36 21L 44 28L 52 35L 72

As a safety feature, interlock 1 pins (39 and 59) on Bank 1 must be shorted to enable the Bank 1 Analog Bus relays to close. The optional 34924T terminal blocks short these pins for you. This feature protects inadvertent routing of high voltages from the Analog Buses to the D-sub connector of the module.

Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide 43

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Low Frequency Multiplexer Modules 34924A 70-Channel Reed Multiplexer

For orientation, the D-sub connector end of the module is facing you.

Bank 2

Bank 1

45H41H 41L 36H 36L 42H 42L

COM

2L 38H 38L 44H 44L 39H 39L

COM

2H37H 37L 45L 40L40H

1 2 3 4 5 6 7 8 9 1011 12131415 1617

47H51H 51L 46H 46L 52H 52L 47L 43H 43L 69H 69L 54H 54L 49H 49L 55H 55L Interlock 2

22 23

24 25

28 29

30 3 1

32 33 34 35

38 39

GND 61H 61L 56H 56L 57H 57L 62H 62L 48H 48L 63H 63L 59H 59L 64H 64L 50H 50L Interlock 2

42 43

45 46

49 50 51

53 54 55

57 5958

61 62

63 64

67 68

69 7 0

71 72 73 74

77 78

GND 67H 67L 66H 66L 68H 68L 53H 53L 58H 58L 70H 70L 65H 65L 60H 60L

NC NC

78-Pin D-Sub Male Connector

Bank 2

Desc Pin Desc Pin Desc Pin Desc Pin Desc Pin Desc Pin

36H 3 43H 29 50H 57 57H 45 64H 55 COM2 H 9

36L 4 43L 30 50L 58 57L 46 64L 56 COM2 L 10

37H 7 44H 13 51H 21 58H 69 65H 73 Interlock 2 39

37L 8 44L 14 51L 22 58L 70 65L 74 Interlock 2 59

38H 11 45H 17 52H 25 59H 53 66H 63 GND 40

38L 12 45L 18 52L 26 59L 54 66L 64 GND 60

39H 15 46H 23 53H 67 60H 75 67H 61 No

Connect

39L 16 46L 24 53L 68 60L 76 67L 62 No

Connect

40H 19 47H 27 54H 33 61H 41 68H 65

40L 20 47L 28 54L 34 61L 42 68L 66

41H 1 48H 49 55H 37 62H 47 69H 31

41L 2 48L 50 55L 38 62L 48 69L 32

42H 5 49H 35 56H 43 63H 51 70H 71

42L 6 49L 36 56L 44 63L 52 70L 72

As a safety feature, interlock 2 pins (39 and 59) on Bank 2 must be shorted to enable the Bank 2 Analog Bus relays to close. The optional 34924T terminal blocks short these pins for you. This feature protects inadvertent routing of high voltages from the Analog Buses to the D-sub connector of the module.

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Low Frequency Multiplexer Modules

34924T Terminal Blocks

Two terminal blocks are available to facilitate wiring connections to the 34924A module:

The 34980A Product Reference CD (shipped with the instrument) contains a 34924T Wiring Log for you to document your wiring configuration for this module. You can open the wiring log file in Microsoft® Excel® or Adobe® Acrobat® format.

34924T-001 (Option 001) Terminal block with solder connectors

34924T-002 (Option 002) Terminal block with screw connectors

34924T-001 Terminal Block

This terminal block with solder-type connections is labeled with the model number and the abbreviated module name. In addition, space is available on the label for you to write the slot number.

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Low Frequency Multiplexer Modules 34924A 70-Channel Reed Multiplexer

B A N K

3 4 5 COM1

8 9 10 11

HLHLHLHLHLH

HLHLHLH L

HLHL

14 15 16

HLHLHLH L

HLHL

HLHLHLHLHLH

20 21 22 23

26 27 28

HLHLHLHL

HLHL

HLHLHLHLHLH

32 33 34 35

61 62 63 64

HLH LHLHLHLH

HLHLHLHL

HLHL

67 68 69

49 50 51 52

HLHLHLHLHLH

HLHLHLH L

HLHL

55 56 57

COM2

37 38 39

HLHLHLHL

HLHL

HLH LHLHLHLH

43 44 45 46

34924T-002 Terminal Block

This terminal block with screw-type connections is labeled with the model number and the abbreviated module name. In addition, space is available on the label for you to write the slot number.

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Low Frequency Multiplexer Modules

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

The 34925A 40/80-Channel Optically-Isolated FET Multiplexer (40/80-Ch FET MUX) module is a high-speed and high-density FET MUX for high throughput production test. This module is divided into two equal banks of non-latching FET switches. This module also contains four armature Analog Bus relays. Through ABus1 and ABus2 you can connect any of the channels to the internal DMM for voltage or resistance measurements. When the power is off, all channel and Analog Bus relays open.

Using program commands or the mainframe front panel, you can control each of the FET channel switches individually, and configure this module for differential (2-wire or 4-wire) or single-ended (1-wire) mode. Refer to the simplified schematics on page 50 and page 54.

If you are using an Keysight 34925T-00x terminal block to connect your DUT to this module, be sure to use the terminal block that corresponds to your module configuration mode (Refer to the terminal block drawings on page 53 and

page 57):

You can confirm the mode in which your module is configured by using the SYSTem:CTYPe? <slot number> program command. This command returns the identity of the plug-in module in the specified slot.

Two-Wire Mode

- two independent 20-channel 2-wire MUXes. This configuration requires neither using external wiring nor connecting through the internal Analog Bus relays.

- one 40-channel, 2-wire MUX. You must use external wiring or connect through the Analog Bus relays to for this configuration.

34925T-001 (Option 001) Terminal block for differential (two- or four-wire) mode

34925T-002 (Option 002) Terminal block for single-ended (1-wire) mode

Whenever you change from 2- or 4-wire mode to 1-wire mode, or the reverse, you must cycle power on the 34980A for the configuration to take effect.

Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide 47

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Low Frequency Multiplexer Modules 34925A 40/80-Channel Optically-Isolated FET Multiplexer

Four-Wire Mode

- You may configure the 34925A as a single 20-channel 4-wire MUX. This configuration requires using neither external wiring nor connecting through the internal Analog Buses. For 4-wire resistance measurements, the instrument automatically pairs channel n on Bank 1 (source) with channel n+20 on Bank 2 (sense) to provide these connections. Four-wire controls occur only when doing 4-wire measurement operations through the internal DMM, such as MEASure:FRESistance? or scanning a channel previously configured as 4-wire.

One-Wire Mode

- two independent 40-channel 1-wire MUXes. This configuration requires neither using external wiring nor connecting through the Analog Bus relays.

- one 80-channel 1-wire MUX. You must use external wiring or connect through the Analog Bus relays for this configuration.

Interlock Protection

This module is interlock protected, which means whenever the D-sub connector end of the modules is exposed, the Analog Bus relays immediately open and disconnect from the Analog Buses. For more information, see “Safety Interlock” on page 11.

Overvoltage Protection

This module also features high voltage detection (< 100 V) and current limiting circuitry to protect the FET relays. This circuitry senses current flows from input overvoltages. These overvoltages may come from either the MUX input or from the Analog Buses. In addition, each channel is also protected from input overvoltages with a resistor.

When overvoltage is detected, all relays (Analog Bus and FET) are opened. While in the overvoltage state, any attempts to close any Analog Bus or FET switch, results in an error status response from the module.

Because all bank relays supply only HI signals, you can apply a LOW signal through COM1 L or COM2 L when you are making 2-wire resistance measurements in 1-wire mode.

Once in the overvoltage state, you must restore normal module operation with one of these actions:

- using the SYSTem:CPON <slot> command. This affects only the module specified.

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Low Frequency Multiplexer Modules

- using the *RST command. This command resets the mainframe and all installed modules to the Factory configuration. This affects all installed modules.

- cycling system power. This affects all installed modules.

If the overvoltage situation is not resolved, clearing the overvoltage will result in a new overvoltage event occurring immediately.

Further FET protection is assured only as one channel in each bank is closed at any time. Thus this module will operate as only a 1:N MUX module. For more information about FET channel closures, refer to page 12.

Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide 49

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Low Frequency Multiplexer Modules 34925A 40/80-Channel Optically-Isolated FET Multiplexer

The three-digit number assigned to each switch represents the channel number.

Bank relays: FET non-latching; Analog Bus relays: Armature non-latching

026

027

028

029

030

031

032

033

034

035

036

037

038

039

040

021

022

023

024

025

001

002

003

004

005

006

007

008

009

010

011

012

013

014

015

016

017

018

019

020

ABus 2 DMM (SENS)

ABus 3

ABus 4

923

913 914

924922

912911

921

ABus 1 DMM (MEAS)

LHLHLHLH

Bank 1

Bank 2

COM 1

COM 2

Analog Buses

Overvoltage Protection

(each channel)

100

51.1

11 11

100

Current-Limiting Circuitry

100

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

This drawing shows two independent 20-channel 2-wire MUXes. To change configuration modes, use the SYSTem:MODule:WIRE:MODE command

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Low Frequency Multiplexer Modules

For orientation, the D-sub connector end is facing you.

Bank 1

Bank 2

17L

36 37

39 40

43 44 45

47 48 49

19 20

21 22

25 26

27 28

29 30 31 32

GND 6H 6L 16H 16L 12H 12L 8H 8L 18H 18L 10H 10L

NC NC NC NC

Reserved 11H 11L 7H 7L 17H 13H 13L 9H 9L 19H 19L 15H 15L Interl ock 1

1 2 3 4 5 6 7 8 9 1011121314151617

Interlock11H 1L 2H 2L 3H 3L

COM1HCOM

4H 4L 14H 14L 5H 5L 20H 20L

50-Pin D-Sub Male Connector

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

Bank 1

Desc Pin Desc Pin Desc Pin Desc Pin Descr Pin

1H 1 6H 35 11H 19 16H 37 COM1 H 7

1L 2 6L 36 11L 20 16L 38 COM1 L 8

2H 3 7H 21 12H 39 17H 23 Interlock 1 17

2L 4 7L 22 12L 40 17L 24 Interlock 1 33

3H 5 8H 41 13H 25 18H 43 Reserved 18

3L 6 8L 42 13L 26 18L 44 GND 34

4H 9 9H 27 14H 11 19H 29 No

Connect

4L 10 9L 28 14L 12 19L 30 No

Connect

5H 13 10H 45 15H 31 20H 15 No

Connect

5L 14 10L 46 15L 32 20L 16 No

Connect

As a safety feature, interlock 1 pins (17 and 33) on Bank 1 must be shorted to enable the Bank 1 Analog Bus relays to close. The optional 34925T-001 (for 2-wire) terminal block shorts these pins for you. This feature protects inadvertent routing of high voltages from the Analog Bus to the D-sub connector of the module.

Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide 51

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Low Frequency Multiplexer Modules 34925A 40/80-Channel Optically-Isolated FET Multiplexer

For orientation, the D-sub connector end of the module is facing you.

Bank 1

Bank 2

34 35 36 37 38 39 40 41 42 43 44 45 46

48 49 50

GND 26H 26L 36H 36L 32H 32L 28H 28L 38H 38L 30H 30L

NC NC NC NC

37L

18 19

23 24 25 26 27 28 29 30 31 32 33

Reserved 31H 31L 27H 27L 37H 33H 33L 29H 29L 39H 39L 35H 35L I nterlock 2

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

23L Interlock 221H 21L 22H 22L 23H

COM2HCOM

24H 24L 34H 34L 25H 25L 40H 40L

50-Pin D-Sub Male Connector

Bank 2

Desc Pin Desc Pin Desc Pin Desc Pin Desc Pin

21H 1 26H 35 31H 19 36H 37 COM2 H 7

21L 2 26L 36 31L 20 36L 38 COM2 L 8

22H 3 27H 21 32H 39 37H 23 Interlock 217

22L 4 27L 22 32L 40 37L 24 Interlock 233

23H 5 28H 41 33H 25 38H 43 Reserved 18

23L 6 28L 42 33L 26 38L 44 GND 34

24H 9 29H 27 34H 11 39H 29 No

Connect

24L 10 29L 28 34L 12 39L 30 No

Connect

25H 13 30H 45 35H 31 40H 15 No

Connect

25L 14 30L 46 35L 32 40L 16 No

Connect

As a safety feature, interlock 2 pins (17 and 33) on Bank 2 must be shorted to enable the Bank 2 Analog Bus relays to close. The optional 34925T-001 (for 2-wire) terminal block shorts these pins for you. This feature protects inadvertent routing of high voltages from the Analog Buses to the D-sub connector of the module.

52 Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide

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Low Frequency Multiplexer Modules

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

This terminal block with screw-type connections is labeled with the model number and the abbreviated module name. In addition, space is available on the label for you to write the slot number.

- All modules that connect to the internal DMM are interlock protected. This means that when an installed module is exposed (no terminal block or cable is connected), the Analog Bus relays are open and disconnected from the Analog Buses. See “Safety

Interlock” on page 11 for further information.

- If you are using an Keysight terminal block to connect your DUT to this module be sure to use the 34925T-001 terminal block that corresponds to the 2- or 4-wire configuration mode. An error will not be generated if you have installed a terminal block that doesn't match the present module configuration.

The 34980A Product Reference CD (shipped with the instrument) contains a 34925T (2-wire mode) Wiring Log for you to document your wiring configuration for this module. You can open the wiring log file in Microsoft® Excel® or Adobe® Acrobat® format.

Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide 53

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Low Frequency Multiplexer Modules 34925A 40/80-Channel Optically-Isolated FET Multiplexer

The three-digit number assigned to each switch represents the channel number.

Bank relays: FET non-latching; Analog Bus relays: Armature non-latching

HHHH

ABus 2 DMM (SENS)

ABus 3

ABus 4

923

913

914

924

922

912

911

921

ABus 1 DMM (MEAS)

001

002

003

004

005

006

007

008

009

010

021

022

023

024

025

026

027

028

029

030

011

012

013

014

015

016

017

018

019

020

031

032

033

034

035

036

037

038

039

040

041

042

043

044

045

046

047

048

049

050

051

052

053

054

055

056

057

058

059

060

061

062

063

064

065

066

067

068

069

070

071

072

073

074

075

076

077

078

079

080

LHLH

Bank 1

Bank 2

COM 2

COM 1

Analo g Buses

Overvoltage Protection

(each channel)

100

51.1

11 11

100

Current-Limiting Circuitry

34925A Simplified Schematic for One-Wire Mode

This drawing shows two independent 40-channel, 1-wire MUXes. To change configuration modes, use the SYSTem:MODule:WIRE:MODE command

54 Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide

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Low Frequency Multiplexer Modules

For orientation, the D-sub connector end of the module is facing you.

Bank 1

Bank 2

36 37

39 40

43 44 45

47 48 49

19 20

21 22

25 26

27 28

29 30 31 32

GND111231322324151635361920

NC NC NC NC

Reserved 21 22 13 14 33 25 26 17 18 37 38 29 30 Int erlock 1

1 2 3 4 5 6 7 8 9 1011 1213 141516 17

Interlock1123456

COM1HCOM

7 8 27 28 9 10 39 40

50-Pin D-Sub Male Connector

34925A D-Sub Connectors for One-Wired Mode

Bank 1

Desc Pin Desc Pin Desc Pin Desc Pin Desc Pin

1 1 11 35 21 19 31 37 COM1 H 7

2 2 12 36 22 20 32 38 COM1 L 8

3 3 13 21 23 39 33 23 Interlock 117

4 4 14 22 24 40 34 24 Interlock 133

5 5 15 41 25 25 35 43 Reserved 18

6 6 16 42 26 26 36 44 GND 34

7 9 17 27 27 11 37 29 No

Connect

8 1018 2828 12 38 30No

Connect

9 1319 4529 31 39 15No

Connect

10 14 20 46 30 32 40 16 No

Connect

As a safety feature, interlock 1 pins (17 and 33) on Bank 1 must be shorted to enable the Bank 1 Analog Bus relays to close. The optional 34925T-002 (for 1-wire) terminal block shorts these pins for you. This feature protects inadvertent routing of high voltages from the Analog Bus to the D-sub connector of the module.

Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide 55

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Low Frequency Multiplexer Modules 34925A 40/80-Channel Optically-Isolated FET Multiplexer

For orientation, the D-sub connector

end of the module is facing you.

Bank 1

Bank 2

36 37

39 40

43 44 45

47 48 49

19 20

21 22

25 26

27 28

29 30 31 32

GND515271 7263 64555675765960

NC NC NC NC

Reserved 61 62 53 54 73 65 66 57 58 77 78 69 70 Int erlock 2

1 2 3 4 5 6 7 8 9 1011121314151617

Interlock 241 42 43 44 45 46

COM2HCOM

47 48 67 68 49 50 79 80

50-Pin D-Sub Male Connector

Bank 2

Desc Pin Desc Pin Desc Pin Desc Pin Desc Pin

411513561197137COM2 H 7

422523662207238COM2 L8

433532163397323Interlock

444542264407424Interlock

455554165257543Reserved 18

466564266267644GND34

479572767117729No

Connect

48 10 58 28 68 12 78 30 No

Connect

49 13 59 45 69 31 79 15 No

Connect

50 14 60 46 70 32 80 16 No

Connect

As a safety feature, interlock 2 pins (17 and 33) on Bank 2 must be shorted to enable the Bank 2 Analog Bus relays to close. The optional 34925T-002 (for 1-wire) terminal block shorts these pins for you. This feature protects inadvertent routing of high voltages from the Analog Buses to the module.

56 Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide

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Low Frequency Multiplexer Modules

34925T-002 Terminal Block for One-Wire Mode

This terminal block with screw-type connections is labeled with the model number and the abbreviated module name. In addition, space is available on the label for you to write the slot number.

If you are using an Keysight terminal block to connect your DUT to this module be sure to use the 34925T-002 terminal block that corresponds to the 1-wire configuration mode. An error will not be generated if you have installed a terminal block that doesn't match the present module configuration.

The 34980A Product Reference CD (shipped with the instrument) contains a 34925T (1-wire mode) Wiring Log for you to document your wiring configuration for this module. You can open the wiring log file in Microsoft® Excel® or Adobe® Acrobat® format.

Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide 57

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Index

Numerics

34921A

connector pinouts description

, 15

external reference

, 18

, 20

programming examples simplified schematic temperature sensor terminal block

, 20

valid measurement

functions

wiring log

, 10

, 20

34922A

connector pinouts description

, 22

, 24

programming examples simplified schematic terminal blocks

, 26, 27

valid measurement

functions

wiring log

, 10

, 26

34923A

connector pinouts description

, 28

, 32, 36

programming examples simplified schematic terminal blocks

, 34, 38

valid measurement

functions

wiring log

, 10

, 34, 38

34924A

connector pinouts description

, 40

, 43

programming examples simplified schematic terminal blocks

, 45, 46

valid measurement

functions

wiring log

, 10

, 45

34925A

connector pinouts description

, 47

, 51, 55

overload protection programming examples simplified schematic terminal blocks

, 53, 57

, 12

, 17

, 20

, 12

, 23

, 12

, 31, 35

, 12

, 42

, 48

, 12

, 50, 54

valid measurement

functions

wiring log

, 10

, 53, 57

connector pinouts

34921A 34922A 34923A 34924A 34925A

, 18 , 24 , 32, 36 , 43 , 51, 55

D-sub pinouts

34921A 34922A 34923A 34924A 34925A

, 18 , 24 , 32, 36 , 43 , 51, 55

external reference

, 20

FET protection

, 48

isothermal block

, 20

operating considerations overload protection overvoltage protection

, 48

pinouts

34921A 34922A 34923A 34924A 34925A

, 18 , 24 , 32, 36 , 43 , 51, 55

temperature sensor

, 20

, 11

terminal block

34921T

, 21

34922T Option 001 34922T Option 002 34923T Option 001 34923T Option 002 34924T Option 001 34924T Option 002 34925T Option 001 34925T Option 002

, 26 , 27 , 34 , 38 , 45 , 46 , 53 , 57

Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide 58

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This information is subject to change without notice © Keysight Technologies 2016 Edition 2 January 2016 Published in USA

34980-90021

www.keysight.com

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Keysight 34921A, 34924A, 34925A, 34922A, 34923A User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual