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Keysight 34970A/34972A
Data Acquisition/Switch Unit
Service Guide
Notices
CAUTION
WARNING
Copyright Notice
© Keysight Technologies 2009 - 2019
No part of this manual may be repro-
duced 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 copyright laws.
Manual Part Number
34972-90010
Edition
Edition 7, April 2019
Printed in:
Printed in Malaysia
Published by:
Keysight Technologies
Bayan Lepas Free Industrial Zone,
11900 Penang, Malaysia
Trademarks
Adobe, the Adobe Logo, Acrobat and
the Acrobat Logo are trademarks of
Adobe Systems Incorporated.
Microsoft is either a registered trademark or a trademark of Microsoft Corporation in the United States and/or
other countries.
Windows and MS Windows are U.S.
registered trademarks of Microsoft Corporation.
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
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.
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.
2 Keysight 34970A/34972A Service Guide
Software Updates/Licenses
Periodically, Keysight releases software updates to fix known defects and
incorporate product enhancements. To search for software updates and the latest
documentation for your product, go to the product page at:
A portion of the software in this product is licensed under terms of the General
Public License Version 2 (“GPLv2”). The text of the license and source code can be
found at:
This product utilizes Microsoft Windows CE. Keysight highly recommends that all
Windows-based computers connected to Windows CE instruments utilize current
anti-virus software. For more information, go to the product page at:
Keysight 34970A/34972A Service Guide 3
Safety Symbols
CAT I
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) Frame or chassis (ground) terminal
Caution, risk of electric shock
Standby supply. Unit is not completely
disconnected from AC mains when
switch is off.
IEC Measurement
Caution, risk of danger (refer to this
manual for specific Warning or Caution
information)
Protective earth (ground) terminal
4 Keysight 34970A/34972A Service Guide
Safety Considerations
Read the information below before using this instrument.
The following general safety precautions must be observed during all phases of
operation, service, and repair of this instrument. Failure to comply with these
precautions or with specific warnings elsewhere in this manual violates safety
standards for 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 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 and select the appropriate power line voltage on the fuse module.
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 34970A/34972A Service Guide 5
Do Not Remove the Instrument Cover
NOTE
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.
Maximum transients on all inputs are limited to 1500 Vpk, referenced to
earth.Measurement is rated for CAT ‘others’, and terminals are not to be
connected directly to mains. Do not use this equipment to measure circuits
where transient overvoltages could exceed this level.
6 Keysight 34970A/34972A Service Guide
Environmental Conditions
The 34970A/34972A is designed for indoor use and in an area with low
condensation. The table below shows the general environmental requirements for
this instrument.
Environmental condition Requirement
Temperature
Humidity
Altitude Up to 2000 m
Pollution degree 2
Operating condition
– 0 °C to 55 °C
Operating condition
– 20% to 80% RH at 40°C or less (non-condensing)
Keysight 34970A/34972A Service Guide 7
Regulatory Markings
1SM1-
The CE mark is a registered trademark
of the European Community. This CE
mark shows that the product complies
with all the relevant European Legal
Directives.
The RCM mark is a registered
trademark of the Australian
Communications and Media Authority.
This text indicates that the instrument
is an Industrial Scientific and Medical
Group 1 Class A product (CISPER 11,
Clause 4).
The CSA mark is a registered
trademark of the Canadian
Standards Association.
This symbol indicates the time period
during which no hazardous or toxic
substance elements are expected to
leak or deteriorate during normal use.
Forty years is the expected useful life
of the product.
ICES/NMB-001 indicates that this ISM
device complies with the
Canadian ICES-001.
Cet appareil ISM est conforme a la
norme NMB-001 du Canada.
8 Keysight 34970A/34972A Service Guide
Waste Electrical and Electronic Equipment (WEEE) Directive
This instrument complies with the WEEE Directive 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.
Keysight 34970A/34972A Service Guide 9
NOTE
Unless otherwise indicated, this manual applies to all serial numbers.
The Keysight Technologies 34970A/34972A combines precision measurement
capability with flexible signal connections for your production and development
test systems. Three module slots are built into the rear of the instrument to accept
any combination of data acquisition or switching modules. The combination of
data logging and data acquisition features makes this instrument a versatile
solution for your testing requirements now and in the future.
Convenient Data Logging Features
– Direct measurement of thermocouples, RTDs, thermistors, DC voltage, AC
voltage, resistance, DC current, AC current, frequency, and period
– Interval scanning with storage of up to 50,000 time-stamped readings
– Independent channel configuration with function, Mx+B scaling, and al
limits available on a per-channel basis
– Intuitive user interface with knob for quick channel selection, menu navigation,
and data entry from the front panel
– Portable, ruggedized case with non-skid feet
®
– BenchLink Data Logger 3 Software for Microsoft
Windows ® included
arm
Flexible Data Acquisition/Switching Features
– 6½-digit multimeter accuracy, stability, and noise rejection
– Up to 60 channels per instrument (120 single-ended channels)
– Reading rates up to 500 readings per second on a single channel and scan
rates up to 250 channels per second
– Choice of multiplexing, matrix, general-purpose Form C switching, RF
switching, digital I/O, totalize, and 16-bit analog output functions
– GPIB (IEEE-488) interface and RS-232 interface are standard on the 34970A.
Local Area Network (LAN) and Universal Serial Bus (USB) are standard on the
34972A.
–SCPI (Standard Commands for Programmable Instruments) compatibility
10 Keysight 34970A/34972A Service Guide
The Front Panel at a Glance
Denotes a menu key. See the next page for details on menu operation.
1 State Storage / Remote Interface Menus
2 Scan Start / Stop Key
3 Measurement Configuration Menu
4 Scaling Configuration Menu
5 Alarm / Alarm Output Configuration Menu
6 Scan-to-Scan Interval Menu
7 Scan List Single Step / Read Key
8 Advanced Measurement / Utility Menus
9 Low-Level Module Control Keys
10 Single-Channel Monitor On / Off Key
11 View Scanned Data, Alarms, Errors Menu
12 Shift / Local Key
13 Knob
14 Navigation Arrow Keys
Keysight 34970A/34972A Service Guide 11
The Front-Panel Menu at a Glance
Several of the front-panel keys guide you through menus to configure various
parameters of the instrument (see previous page). The following steps
demonstrate the menu structure using the key.
1 Press the menu key. You are automatically guided
2 Press the same menu key again to move to the
to the first level of the menu. Rotate the knob to
view the other choices on the first level of the
menu.
The menu will automatically time out after about
20 seconds of inactivity. You will be returned to
the operation in progress prior to entering the
menu.
next item of the menu. Typically, this is where you
choose parameter values for the selected
operation.
12 Keysight 34970A/34972A Service Guide
3 Rotate the knob to view the choices on this level
NOTE
of the menu. When you reach the end of the list,
rotate the knob in the opposite direction to view
all of the other choices.
The current selection is highlighted for emphasis.
All other choices are dimmed.
4 Press the same menu key again to accept the
change and exit the menu. A brief confirmation
message is displayed.
Tip: To review the current configuration of a specific menu, press the
menu key several times. A message NO CHANGES is displayed when you
exit the menu.
Keysight 34970A/34972A Service Guide 13
Display Annunciators
SCAN
MON
VIEW Scanned readings, alarms, errors, or relay cycles are being viewed.
CONFIG Channel configuration is in progress on displayed channel.
ADRS Instrument is addressed to listen or talk over the remote interface.
RMT Instrument is in remote mode (remote interface).
ERROR
EXT Instrument is configured for an external scan interval.
ONCE
MEM (34970A) Reading memory overflow; new readings will overwrite the oldest readings.
MEM (34972A)
AUTO (34972A) USB logging is active.
LAST Viewed data is the last reading stored during most recent scan.
MIN Viewed data is the minimum reading stored during most recent scan.
MAX Viewed data is the maximum reading stored during most recent scan.
Scan is in progress or enabled. Press and hold again to turn off.
Monitor mode is enabled. Press again to turn off.
Measurement is in progress.
Hard ware or remote interface errors are detected. Press to read errors.
Scan Once mode is enabled. Press to initiate and hold key to disable.
A USB drive is connected to the instrument (annunciator on), or data is being
written to or read from the USB drive (annunciator flashing).
SHIFT
4W 4-wire function is in use on displayed channel.
OC Offset compensation is enabled on displayed channel.
has been pressed. Press again to turn off.
14 Keysight 34970A/34972A Service Guide
Alarms are enabled on displayed channel.
Mx+B scaling is enabled on displayed channel.
HI or LO alarm condition has occurred on indicated alarms.
New serial number prefixes start with MY59000101 and SG59000101.
Keysight 34970A/34972A Service Guide 15
The 34970A Rear Panel at a Glance
WARNING
1 Slot Identifier (100,200, 300)
2 Ext Trig Input / Alarm Outputs / Channel
Advance Input / Channel Closed Output
3 RS-232 Interface Connector
Use the Menu to:
– Select the GPIB or RS-232 interface (see Chapter 2).
– Set the GPIB address (see Chapter 2).
– Set the RS-232 baud rate, parity, and flow control mode (see Chapter 2).
4 Power-Line Fuse-Holder Assembly
5 Power-Line Voltage Setting
6 Chassis Ground Screw
7 GPIB (IEEE-488) Interface Connector
For protection from electrical shock, the power cord ground must not be
defeated. If only a two-contact electrical outlet is available, connect the
instrument’s chassis ground screw (see above) to a good earth ground.
16 Keysight 34970A/34972A Service Guide
The 34972A Rear Panel at a Glance
WARNING
For serial number MY59000100 & SG59000100 and below.
Keysight 34970A/34972A Service Guide 17
1 Slot Identifier (100,200, 300)
2 Chassis Ground Screw
3 Ext Trig Input / Alarm Outputs / Channel
Advance Input / Channel Closed Output
Use the Menu to:
– Select and configure the LAN and USB interfaces (see Chapter 2).
[a] Under some conditions, while using the USB interface with the 34972A, you may experience connection or data
loss in the presence of an electrical transient from the main power line. You can re-establish the USB
communication by performing a reboot (cycle power) on the instrument. You can make the USB connection less
susceptible to a potential power line transient by inserting a USB hub in the connection between the computer and
the instrument.
4 Power-Line Fuse-Holder Assembly
5 LAN Connector
6 USB Drive Connector
7 USB Interface Connector
[a]
For protection from electrical shock, the power cord ground must not be
defeated. If only a two-contact electrical outlet is available, connect the
instrument’s chassis ground screw (see above) to a good earth ground.
For serial number MY59000101 & SG59000101 and above.
WARNING
18 Keysight 34970A/34972A Service Guide
1 Slot Identifier (100,200, 300)
2 Chassis Ground Screw
3 Ext Trig Input / Alarm Outputs / Channel
Advance Input / Channel Closed Output
Use the Menu to:
– Select and configure the LAN and USB interfaces (see Chapter 2).
4 Power-Line Fuse-Holder Assembly
5 LAN Connector
6 USB Drive Connector
7 USB Interface Connector
For protection from electrical shock, the power cord ground must not be
defeated. If only a two-contact electrical outlet is available, connect the
instrument’s chassis ground screw (see above) to a good earth ground.
The Plug-In Modules at a Glance
For complete specifications on each plug-in modules, refer to the module
sections in Chapter 1.
34901A 20-Channel Armature Multiplexer
– 20 channels of 300 V switching
– Two channels for DC or AC current measurements (100 nA to 1A)
– Built-in thermocouple reference junction
– Switching speed of up to 60 channels per second
– Connects to the internal multimeter
– For detailed information and a module diagram, see page 151.
Each of the 20 channels switches both HI and LO inputs, thus providing fully
isolated inputs to the internal multimeter. The module is divided into two banks of
10 two-wire channels each. When making four-wire resistance measurements,
channels from Bank A are automatically paired with channels from Bank B. Two
additional fused channels are included on the module (22 channels total) for
making calibrated DC or AC current measurements with the internal multimeter
(external shunt resistors are not required). You can close multiple channels on this
module only if you have not configured any channels to be part of the scan list.
Otherwise, all channels on the module are break-before-make.
34902A 16-Channel Reed Multiplexer
– 16 channels of 300 V switching
– Built-in thermocouple reference junction
– Switching speed of up to 250 channels per second
– Connects to the internal multimeter
– For detailed information and a module diagram, see page 153.
Use this module for high-speed scanning and high-throughput automated test
applications. Each of the 16 channels switches both HI and LO inputs, thus
providing fully isolated inputs to the internal multimeter. The module is divided
into two banks of eight two-wire channels each. When making four-wire
resistance measurements, channels from Bank A are automatically paired with
channels from Bank B. You can close multiple channels on this module only if you
Keysight 34970A/34972A Service Guide 19
have not configured any channels to be part of the scan list. Otherwise, all
channels on the module are break-before-make.
34903A 20-Channel Actuator / General-Purpose Switch
– 300 V, 1 A actuation and switching
– SPDT (Form C) latching relays
– Breadboard area for custom circuits
– For detailed information and a module diagram, see page 155.
Use this module for those applications that require high-integrity contacts or
quality connections of non-multiplexed signals. This module can switch 300 V, 1 A
(50 W maximum switch power) to your device under test or to actuate external
devices. Screw terminals on the module provide access to the Normally-Open,
Normally-Closed, and Common contacts for each of the 20 switches. A
breadboard area is provided near the screw terminals to implement custom
circuitry, such as simple filters, snubbers, or voltage dividers.
34904A 4x8 Two-Wire Matrix Switch
– 32 two-wire crosspoints
– Any combination of inputs and outputs can be connected at a time
– 300 V, 1 A switching
– For detailed information and a module diagram, see page 156.
Use this module to connect multiple instruments to multiple points on your device
under test at the same time. You can connect rows and columns between multiple
modules to build larger matrices such as 8x8 and 4x16, with up to 96 crosspoints
in a single mainframe.
34905/6A Dual 4-Channel RF Multiplexers
– 34905A (50Ω) / 34906A (75Ω)
– 2 GHz bandwidth with on-board SMB connections
– 1 GHz bandwidth with SMB-to-BNC adapter cables provided
– For detailed information and a module diagram, see page 158.
20 Keysight 34970A/34972A Service Guide
These modules offer wideband switching capabilities for high frequency and
pulsed signals. Each module is organized in two independent banks of 4-to-1
multiplexers. Both modules offer low crosstalk and excellent insertion loss
performance. To create larger RF multiplexers, you can cascade multiple banks
together. Only one channel in each bank may be closed at a time.
34907A Multifunction Module
– Two 8-bit Digital Input/Output ports, 400 mA sink, 42 V open collector
– 100 kHz Totalize input with 1 Vpp sensitivity
– Two 16-bit, ±12 V Calibrated Analog Outputs
– For detailed information and module block diagrams, see page 162.
Use this module to sense status and control external devices such as solenoids,
power relays, and microwave switches. For greater flexibility, you can read digital
inputs and the count on the totalizer during a scan.
34908A 40-Channel Single-Ended Multiplexer
– 40 channels of 300 V single-ended (common LO) switching
– Built-in thermocouple reference junction
– Switching speed of up to 60 channels per second
– Connects to the internal multimeter
– For detailed information and a module diagram, see page 160.
Use this module for high-density switching applications which require single-wire
inputs with a common LO. All relays are break-before-make to ensure that only
one relay is connected at any time.
Keysight 34970A/34972A Service Guide 21
In This Book
Specifications
and plug-in modules.
Quick Start
front-panel features.
Front-Panel Overview
describes some of the instrument’s menu features.
Calibration Procedures
adjustment procedures for the instrument.
Theory of Operation
to the operation the instrument.
Service
Technologies for servicing, or for servicing it yourself. It also contains a list of
replaceable parts.
If you have questions relating to the operation of the 34970A/34972A, call
1-800-452-4844 in the United States, or contact your nearest Keysight
Technologies Sales Office.
If your 34970A/34972A fails within one year of original purchase, Keysight will
replace it free of charge. Call 1-800-829-4444 and select “Option 3” followed by
“Option 1”.
Chapter 6 provides guidelines for returning your instrument to Keysight
Chapter 1 lists the technical specifications for the mainframe
Chapter 2 helps you get familiar with a few of the instrument’s
Chapter 3 introduces you to the front-panel menus and
Chapter 4 provides calibration, verification, and
Chapter 5 describes block and circuit level theory related
22 Keysight 34970A/34972A Service Guide
Table of Contents
Software Updates/Licenses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Before Applying Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Ground the Instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Do Not Operate in an Explosive Atmosphere . . . . . . . . . . . . . . . . . . .5
Do Not Remove the Instrument Cover . . . . . . . . . . . . . . . . . . . . . . . .6
Do Not Modify the Instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
In Case of Damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Environmental Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Regulatory Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Waste Electrical and Electronic Equipment (WEEE) Directive . . . . . . . .9
Product category . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Sales and Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
The Front Panel at a Glance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
The Front-Panel Menu at a Glance . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Display Annunciators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
The 34970A Rear Panel at a Glance . . . . . . . . . . . . . . . . . . . . . . . . . . .16
The 34972A Rear Panel at a Glance . . . . . . . . . . . . . . . . . . . . . . . . . . .17
The 34972A Rear Panel at a Glance . . . . . . . . . . . . . . . . . . . . . . . . . . .18
The Plug-In Modules at a Glance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
In This Book . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
1Specifications
2Quick Start
Quick Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
To Prepare the Instrument for Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
To Connect Wiring to a Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Keysight 34970A/34972A Service Guide 23
To Set the Time and Date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
To Configure a Measurement Channel . . . . . . . . . . . . . . . . . . . . . . . . . 37
To Monitor a Single Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
To Close a Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
If the Instrument Does Not Turn On . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
To Adjust the Carrying Handle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
To Rack Mount the Instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
3 Front-Panel Overview
Front-Panel Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Front-Panel Menu Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
To Unsecure for Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
To Secure Against Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
To Change the Security Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
To Perform a Zero Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
To Apply Mx+B Scaling to Measurements . . . . . . . . . . . . . . . . . . . . . . . 57
To Read the Relay Cycle Count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
To Read a Digital Input Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
To Write to a Digital Output Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
To Read the Totalizer Count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
To Output a DC Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
4 Calibration Procedures
Calibration Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Keysight Technologies Calibration Services . . . . . . . . . . . . . . . . . . . . . 66
Calibration Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Adjustment is Recommended . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Time Required for Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Automating Calibration Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
24 Keysight 34970A/34972A Service Guide
Recommended Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68
Input Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
Calibration Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
To Unsecure the Instrument Without the Security Code . . . . . . . . .72
Calibration Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74
Calibration Count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74
Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
Aborting a Calibration in Progress . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
Test Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76
Performance Verification Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
Self-Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78
Quick Performance Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
Performance Verification Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
Internal DMM Verification Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
Zero Offset Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
Gain Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82
Optional AC Performance Verification Tests . . . . . . . . . . . . . . . . . . . . .87
Internal DMM Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .88
Zero Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .88
Gain Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89
–10 VDC Adjustment Procedure (Optional) . . . . . . . . . . . . . . . . . . . . . .92
Plug-in Module Test Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . .94
Relay Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96
Relay Cycle Count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96
(Optional) 34901A Relay Contact Resistance Verification . . . . . . . .97
(Optional) 34902A Relay Contact Resistance Verification . . . . . . .104
(Optional) 34903A Relay Contact Resistance Verification . . . . . . .109
(Optional) 34904A Relay Contact Resistance Verification . . . . . . .110
(Optional) 34905/06A Relay Contact Resistance Verification . . . .113
(Optional) 34908A Relay Contact Resistance Verification . . . . . . .114
Thermocouple Reference Junction (Optional) . . . . . . . . . . . . . . . . . . .120
Thermocouple Reference Junction Verification . . . . . . . . . . . . . . .120
Keysight 34970A/34972A Service Guide 25
Thermocouple Reference Junction Adjustments . . . . . . . . . . . . . . 121
34907A Analog Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Analog Output Verification Test . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Analog Output Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
5Theory of Operation
Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
System Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Floating Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Earth-Referenced Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Backplane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Analog Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Digital Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Internal DMM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
DMM Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
Input Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Ohms Current Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
AC Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
A-to-D Converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
Switch Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Switch Module Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
Relay Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
34901A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
34902A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
34903A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
34904A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
34905A/34906A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
34908A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
Multifunction Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
26 Keysight 34970A/34972A Service Guide
Multifunction Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .162
Totalizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .164
Analog Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .165
Digital I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .166
6Service
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .170
Operating Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .171
Types of Service Available . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .172
Repackaging for Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .173
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .173
Electrostatic Discharge (ESD) Precautions . . . . . . . . . . . . . . . . . . . . .174
Surface Mount Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .174
To Replace the Power-Line Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . .175
Troubleshooting Hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .175
Self-Test Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .179
Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .184
General Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .185
Internal DMM Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .186
Front Panel Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .187
Additional Chassis Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . .188
Plug-In Module Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .189
Recyclable Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .191
Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .194
To Order Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .194
Parts List for 34970A/34972A and 34901A . . . . . . . . . . . . . . . . . .194
Keysight 34970A/34972A Service Guide 27
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28 Keysight 34970A/34972A Service Guide
Keysight 34970A/34972A Data Acquisition/Switch Unit
Service Guide
1 Specifications
For the specifications and characteristics of the 34970A/34972A Data
Acquisition/Switch Unit, refer to the datasheet at
http://literature.cdn.keysight.com/litweb/pdf/5965-5290EN.pdf
29
1 Specifications
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30 Keysight 34970A/34972A Service Guide
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