Keysight Technologies 34902A User manual

Keysight 34970A
Data Acquisition/Switch Unit
Service
Guide

© Copyright Keysight Technologies,
1997- 2015
No part of this manual may be
reproduced in any form or by any
means (including electronic storage
and retrieval or translation into a
foreign language) without prior
agreement and written consent from
Keysight Technologies as governed by
the United States and international
copyright laws.
Manual Part Number
34970-90012, (order as
34970-90101 manual set)
Edition
Edition 7 , February 2015
Printed in Malaysia
Keysight Technologies,
815 14th Street S.W.
Loveland, Colorado 80537 U.S.A.
Assistance
Product maintenance agreements and
other customer assistance agreements are
available for Keysight Technologies
products. For assistance, contact your
nearest Keysight Technologies Sales and
Service
Office. Further information is
available o n the Keysight web site at
www. keysight .com/find/assist.
Trademark Information
Microsoft® and Windows® are U.S.
registered trademarks of Microsoft
Corporation. All other brand and
product names are trademarks or
registered trademarks of their
respective companies.
Certification
Keysight Technologies certifies that this
product met its published specifications at
the time of shipment from the factory.
Keysight Technologies further certifies
that its calibration measurements are
traceable to the United States National
Institute of Standards and Technology, to
the extent allowed by that organization's
calibration facility, and to the calibration
facilities of other International Standards
Organization members.
Warranty
The material contained in this
documentis 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 mer-chantability 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 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 will control.
Technologies 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.
Restricted Rights Legend
If software is for use in the performance of
a U.S. Government prime contract or
subcontract, Software is delivered and
licensed as “Commercial computer soft-
ware” as defined in DFAR 252.227-7014
(June 1995), or as a “commercial item” as
defined in FAR 2.101(a) or as
“Restricted computer software” as defined
in FAR 52.227-19 (June 1987) or any
equivalent agency regulation or contract
clause. Use, duplication or disclosure of
Software is subject to Keysight
Technologies’ standard commercial
license terms, and non-DOD Departments
and Agencies of the U.S. Government will
receive no greater than Restricted Rights
as defined in FAR 52.227-19(c)(1-2) (June
1987).
U.S. Government users will receive no
greater than Limited Rights as defined in
FAR 52.227-14 (June 1987) or DFAR
252.227-7015 (b)(2) (November 1995), as
applicable in any technical data.
Safety Notices
Do not defeat power cord safety ground
feature. Plug in to a grounded outlet.
Do not use product in any manner not
specified by the manufacturer.
Do not install substitute parts or perform
any unauthorized modification to the
product. Return the product to a Keysight
Technologies Sales and Service Office for
service and repair to ensure that safety
features are maintained.
WARNING
A WARNING notice denotes a hazard.
It calls attention to an operating proce-
dure, 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.
CAUTION
A CAUTION notice denotes a hazard.
It calls attention to an operating proce-
dure, 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.
Symbols
WARNING
Main power disconnect: Unplug
product from wall outlet and remove
power cord before servicing. Only quali-
fied, service-trained personnel should
remove the cover from the instrument
or connect external wiring to a module.
For continued protection against fire,
replace the line fuse only with a fuse
of the specified type and rating.
Earth ground
Chassis ground
Risk of electric shock
warranty.fm Page 0 Tuesday, May 9, 2006 4:55 PM

The Keysight Technologies 34970A 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 alarm 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
Flexible Data Acquisition/Switching Features
•61⁄2-digit multimeter accuracy, stability, and noise rejection
•Up to 60 channels per instrument (120 single-ended channels)
•Reading rates up to 600 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
•SCPI (Standard Commands for Programmable Instruments) compatibility
Warning The procedures in this manual are intended for use by qualified,
service-trained personnel only.
Keysight 34970A
Data Acquisition / Switch Unit
Note: Unless otherwise indicated, this manual applies to all serial numbers.
Page 1 (Service Guide)

The Front Panel at a Glance
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
Denotes a menu key. See the next page for details on menu operation.
2

The Front-Panel Menus 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.
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.
4 Press the same menu key again to accept the
change and exit the menu. A brief confirmation
message is displayed.
2 Press the same menu key again to move
to the next item of the menu. Typically,
this is where you choose parameter values
for the selected operation.
3 Rotate the knob to view the choices on this
level 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.
1 Press the menu key. You are automatically
guided 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 timeout after
about 20 seconds of inactivity. You will be
returned to the operation in progress prior
to entering the menu.
3
G

Display Annunciators
To review the display annunciators, hold down the key as you
turn on the instrument.
SCAN
MON
VIEW
CONFIG
ADRS
RMT
ERROR
EXT
ONCE
MEM
LAST
MIN
MAX
SHIFT
4W
OC
Scan is in progress or enabled. Press and hold again to turn off.
Monitor mode is enabled. Press again to turn off.
Scanned readings, alarms, errors, or relay cycles are being viewed.
Channel configuration is in progress on displayed channel.
Measurement is in progress.
Instrument is addressed to listen or talk over the remote interface.
Instrument is in remote mode (remote interface).
Hardware or remote interface errors are detected. Press to read errors.
Instrument is configured for an external scan interval.
Scan Once mode is enabled. Press to initiate and hold key to disable.
Reading memory overflow; new readings will overwrite the oldest readings.
Viewed data is the last reading stored during most recent scan.
Viewed data is the minimum reading stored during most recent scan.
Viewed data is the maximum reading stored during most recent scan.
has been pressed. Press again to turn off.
4-wire function is in use on displayed channel.
Offset compensation is enabled on displayed channel.
Alarms are enabled on displayed channel.
Mx+B scaling is enabled on displayed channel.
HI or LO alarm condition has occurred on indicated alarms.
4

The Rear Panel at a Glance
WARNING 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.
1 Slot Identifier (100, 200, 300)
2 Ext Trig Input / Alarm Outputs / Channel
Advance Input / Channel Closed Output
(for pinouts, see chapter 4 in User’s Guide)
3 RS-232 Interface Connector
4 Power-Line Fuse-Holder Assembly
5 Power-Line Voltage Setting
6 Chassis Ground
7 GPIB (IEEE-488) Interface Connector
Use the Menu to:
• Select the GPIB or RS-232 interface (see chapter 2 in User’s Guide).
• Set the GPIB address (see chapter 2 in User’s Guide).
• Set the RS-232 baud rate, parity, and flow control mode (see chapter 2 in User’s Guide).
5

The Plug-In Modules at a Glance
For complete specifications on each plug-in module, 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 1 A)
•Built-in thermocouple reference junction
•Switching speed of up to 60 channels per second
•Connects to the internal multimeter
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
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 have
not configured any channels to be part of the scan list. Otherwise, all
channels on the module are break-before-make.
6

34903A 20-Channel Actuator/General-Purpose Switch
•300 V, 2 A actuation and switching
•SPDT (Form C) latching relays
•Breadboard area for custom circuits
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
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
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.
7

34907A Multifunction Module
•Two 8-bit Digital Input/Output ports, 400 mA sink, 42 V open collector
•100 kHz Totalize input with 28 bits of resolution
•Two 16-bit, ± 12 V Calibrated Analog Outputs
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 isothermal reference junction
•Switching speed of up to 60 channels per second
•Connects to the internal multimeter
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.
8

In This Book
Specifications Chapter 1 lists the technical specifications for the
mainframe and plug-in modules.
Quick Start Chapter 2 helps you get familiar with a few of the
instrument’s front-panel features.
Front-Panel Overview Chapter 3 introduces you to the front-panel
menus and describes some of the instrument’s menu features.
Calibration Procedures Chapter 4 provides calibration, verification,
and adjustment procedures for the instrument.
Theory of Operation Chapter 5 describes block and circuit level
theory related to the operation the instrument.
Service Chapter 6 provides guidelines for returning your instrument
to KeysightTechnologies for servicing, or for servicing it yourself.
Replaceable Parts Chapter 7 contains detailed parts lists for the
mainframe and plug-in modules.
Schematics Chapter 8 contains the instrument’s block diagram,
schematics, disassembly drawings, and component locator drawings.
If you have questions relating to the operation of the 34970A,
call 1-800-452-4844 in the United States, or contact your nearest
Keysight Technologies Sales Office.
If your 34970A 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".
9

Contents
Chapter 1Specifications
DC, Resistance, and Temperature Accuracy Specifications 16
DC Measurement and Operating Characteristics 17
AC Accuracy Specifications 18
AC Measurement and Operating Characteristics 19
Measurement Rates and System Characteristics 20
Module Specifications 21
BenchLink Data Logger Software Specifications 24
Product and Module Dimensions 25
To Calculate Total Measurement Error 26
Interpreting Internal DMM Specifications 28
Configuring for Highest Accuracy Measurements 31
Chapter 2Quick Start
To Prepare the Instrument for Use 35
To Connect Wiring to a Module 36
To Set the Time and Date 38
To Configure a Measurement Channel 39
To Monitor a Single Channel 40
To Close a Channel 41
If the Instrument Does Not Turn On 42
To Adjust the Carrying Handle 44
To Rack Mount the Instrument 45
Chapter 3Front-Panel Overview
Front-Panel Menu Reference 49
To Unsecure for Calibration 51
To Secure Against Calibration 51
To Change the Security Code 52
Error Messages 52
To Perform a Zero Adjustment 53
To Apply Mx+B Scaling to Measurements 54
To Read the Relay Cycle Count 55
To Read a Digital Input Port 56
To Write to a Digital Output Port 57
To Read the Totalizer Count 58
To Output a DC Voltage 59
Contents
10

Chapter 4Calibration Procedures
KeysightTechnologies Calibration Services 63
Calibration Interval 63
Adjustment is Recommended 63
Time Required for Calibration 64
Automating Calibration Procedures 64
Recommended Test Equipment 65
Input Connections 66
Calibration Security 67
To Unsecure the Instrument Without the Security Code 68
Calibration Message 69
Calibration Count 69
Calibration Procedure 70
Aborting a Calibration in Progress 70
Test Considerations 71
Performance Verification Tests 72
Self-Test 73
Quick Performance Check 74
Performance Verification Tests 74
Internal DMM Verification Tests 75
Zero Offset Verification 75
Gain Verification 77
Optional AC Performance Verification Tests 80
Internal DMM Adjustments 81
Zero Adjustment 81
Gain Adjustment 82
–10 Vdc Adjustment Procedure (Optional) 85
Plug-in Module Test Considerations 87
Relay Verification 88
Relay Cycle Count 88
34901A Relay Contact Resistance Verification (Optional) 89
34902A Relay Contact Resistance Verification (Optional) 96
34903A Relay Contact Resistance Verification (Optional) 101
34904A Relay Contact Resistance Verification (Optional) 102
34905A/06A Relay Contact Resistance Verification (Optional) 105
34908A Relay Contact Resistance Verification (Optional) 106
Thermocouple Reference Junction (Optional) 112
Thermocouple Reference Junction Verification 112
Thermocouple Reference Junction Adjustments 113
34907A Analog Output 114
Analog Output Verification Test 114
Analog Output Adjustment 115
Contents
Contents
11

Chapter 5Theory of Operation
System Block Diagram 119
Floating Logic 120
Memory 123
Earth-Referenced Logic 124
Power Supplies 125
Front Panel 127
Backplane 128
Analog Bus 128
Digital Bus 128
Internal DMM 129
DMM Block Diagram 129
Input 130
Input Amplifier 131
Ohms Current Source 133
AC Circuit 134
A-to-D Converter 136
Switch Modules 138
Switch Module Control 138
Relay Drivers 140
34901A 142
34902A 144
34903A 146
34904A 147
34905A/34906A 148
34908A 149
Multifunction Module 151
Multifunction Control 151
Totalizer 153
Analog Output 154
Digital I/O 155
Chapter 6 Service
Operating Checklist 159
Is the instrument inoperative? 159
Does the instrument fail self-test? 159
Is the Current measurement function inoperative? 159
Types of Service Available 160
Standard Repair Service (worldwide) 160
Express Exchange (U.S.A. only) 160
Repackaging for Shipment 161
Cleaning 161
Electrostatic Discharge (ESD) Precautions 162
Surface Mount Repair 162
To Replace the Power-Line Fuse 163
Contents
Contents
12

Chapter 6 Service (continued)
Troubleshooting Hints 163
Unit is Inoperative 163
Unit Reports Error 705 164
Isolating to an Assembly 164
Unit Fails Self-Test 164
Power Supplies 165
Self-Test Procedures 167
Power-On Self-Test 167
Complete Self-Test 167
Plug-in Module Self-Test 167
Self-Tests 168
Battery Check and Replacement 172
To Verify the Battery 173
To Replace the Battery 173
Disassembly 174
General Disassembly 175
Internal DMM Disassembly 176
Front-Panel Chassis Disassembly 177
Additional Disassembly 178
Plug-in Module Disassembly 179
Chapter 7 Replaceable Parts
Replaceable Parts 182
To Order Replaceable Parts 182
34970A Mainframe 183
34970-66501 Main PC Assembly (A1) 184
34970-66502 Front-Panel and Keyboard PC Assembly (A2) 189
34970-66503 Backplane PC Assembly (A3) 190
34970-66504 Internal DMM PC Assembly (A4) 191
34901A 20-Channel Multiplexer 196
34902A 16-Channel Multiplexer 200
34903A 20-Channel Actuator 202
34904A 4x8 Matrix 204
34905A/34906A RF Multiplexer 207
34907A Multifunction Module 209
34908A 40-Channel Multiplexer 213
Manufacturer’s List 216
Contents
Contents
13

Chapter 8Schematics
Keysight34970A System Block Diagram 221
A1 Component Locator (top) 222
A1 Component Locator (bottom) 223
A1 Power Supply Schematic (Sheet 1 of 4) 224
A1 Floating Logic Schematic (Sheet 2 of 4) 225
A1 Earth Referenced Logic Schematic (Sheet 3 of 4) 226
A1 Memory Schematic (Sheet 4 of 4) 227
A2 Component Locator 228
A2 Display and Keyboard Schematic 229
A3 Component Locator 230
A3 Backplane Schematic 231
A4 Component Locator (top) 232
A4 Component Locator (bottom) 233
A4 Input and Protection Schematic (Sheet 1 of 4) 234
A4 Input Amplifier and Ohms Current Schematic (Sheet 2 of 4) 235 A4
AC Schematic (Sheet 3 of 4) 236
A4 A/D Converter Schematic (Sheet 4 of 4) 237
34901A 20-Channel Multiplexer Component Locator 238
34901A 20-Channel Multiplexer Schematic (Sheet 1 of 5) 239
34901A 20-Channel Multiplexer Schematic (Sheet 2 of 5) 240
34901A 20-Channel Multiplexer Schematic (Sheet 3 of 5) 241
34901A 20-Channel Multiplexer Schematic (Sheet 4 of 5) 242
34901A 20-Channel Multiplexer Schematic (Sheet 5 of 5) 243
34902A 16-Channel Multiplexer Component Locator 244
34902A 16-Channel Multiplexer Schematic (Sheet 1 of 4) 245
34902A 16-Channel Multiplexer Schematic (Sheet 2 of 4) 246
34902A 16-Channel Multiplexer Schematic (Sheet 3 of 4) 247
34902A 16-Channel Multiplexer Schematic (Sheet 4 of 4) 248
34903A 20-Channel Actuator Component Locator 249
34903A 20-Channel Actuator Schematic (Sheet 1 of 3) 250
34903A 20-Channel Actuator Schematic (Sheet 2 of 3) 251
34903A 20-Channel Actuator Schematic (Sheet 3 of 3) 252
34904A 4x8 Matrix Component Locator 253
34904A 4x8 Matrix Schematic (Sheet 1 of 3) 254
34904A 4x8 Matrix Schematic (Sheet 2 of 3) 255
34904A 4x8 Matrix Schematic (Sheet 3 of 3) 256
34905A/34906A RF Multiplexer Component Locator 257
34905A/34906A RF Multiplexer Schematic (Sheet 1 of 2) 258
34905A/34906A RF Multiplexer Schematic (Sheet 2 of 2) 259
34907A Multifunction Module Component Locator 260
34907A Multifunction Module Schematic (Sheet 1 of 5) 261
34907A Multifunction Module Schematic (Sheet 2 of 5) 262
34907A Multifunction Module Schematic (Sheet 3 of 5) 263
34907A Multifunction Module Schematic (Sheet 4 of 5) 264
34907A Multifunction Module Schematic (Sheet 5 of 5) 265
34908A 40-Channel Multiplexer Component Locator 266
34908A 40-Channel Multiplexer Schematic (Sheet 1 of 3) 267
34908A 40-Channel Multiplexer Schematic (Sheet 2 of 3) 268
34908A 40-Channel Multiplexer Schematic (Sheet 3 of 3) 269
Contents
Contents
14

1
Specifications
•DC, Resistance, and Temperature Accuracy Specifications, on page 16
•DC Measurement and Operating Characteristics, on page 17
•AC Accuracy Specifications, on page 18
•AC Measurement and Operating Characteristics, on page 19
•Measurement Rates and System Characteristics, on page 20
•Module Specifications:
34901A, 34902A, 34908A, 34903A, 34904A, on page 21
34905A, 34906A, on page 22
Typical AC Performance Graphs, on page 23
34907A, on page 24
•BenchLink Data Logger Software Specifications, on page 24
•Product and Module Dimensions, on page 25
•To Calculate Total Measurement Error, on page 26
•Interpreting Multimeter Specifications, on page 28
•Configuring for Highest Accuracy Measurements, on page 31
1

DC, Resistance, and Temperature Accuracy Specifications
± ( % of reading + % of range )
[1]
Includes measurement error, switching error, and transducer conversion error
Function Range [3] Test Current or
Burden Voltage
24 Hour [2]
23 °C ±1 °C
90 Day
23 °C ±5 °C
1 Year
23 °C ±5 °C
Temperature
Coefficient /°C
0 °C – 18 °C
28 °C – 55 °C
DC Voltage 100.0000 mV
1.000000 V
10.00000 V
100.0000 V
300.000 V
0.0030 + 0.0035
0.0020 + 0.0006
0.0015 + 0.0004
0.0020 + 0.0006
0.0020 + 0.0020
0.0040 + 0.0040
0.0030 + 0.0007
0.0020 + 0.0005
0.0035 + 0.0006
0.0035 + 0.0030
0.0050 + 0.0040
0.0040 + 0.0007
0.0035 + 0.0005
0.0045 + 0.0006
0.0045 + 0.0030
0.0005 + 0.0005
0.0005 + 0.0001
0.0005 + 0.0001
0.0005 + 0.0001
0.0005 + 0.0003
Resistance [4] 100.0000 Ω
1.000000 kΩ
10.00000 kΩ
100.0000 kΩ
1.000000 MΩ
10.00000 MΩ
100.0000 MΩ
1 mA current source
1 mA
100 µA
10 µA
5 µA
500 nA
500 nA || 10 MΩ
0.0030 + 0.0035
0.0020 + 0.0006
0.0020 + 0.0005
0.0020 + 0.0005
0.002 + 0.001
0.015 + 0.001
0.300 + 0.010
0.008 + 0.004
0.008 + 0.001
0.008 + 0.001
0.008 + 0.001
0.008 + 0.001
0.020 + 0.001
0.800 + 0.010
0.010 + 0.004
0.010 + 0.001
0.010 + 0.001
0.010 + 0.001
0.010 + 0.001
0.040 + 0.001
0.800 + 0.010
0.0006 + 0.0005
0.0006 + 0.0001
0.0006 + 0.0001
0.0006 + 0.0001
0.0010 + 0.0002
0.0030 + 0.0004
0.1500 + 0.0002
DC Current
34901A Only
10.00000 mA
100.0000 mA
1.000000 A
< 0.1 V burden
< 0.6 V
< 2 V
0.005 + 0.010
0.010 + 0.004
0.050 + 0.006
0.030 + 0.020
0.030 + 0.005
0.080 + 0.010
0.050 + 0.020
0.050 + 0.005
0.100 + 0.010
0.002 + 0.0020
0.002 + 0.0005
0.005 + 0.0010
Temperature Type Best Range Accuracy [5] Extended Range Accuracy [5]
Thermocouple [6] B
E
J
K
N
R
S
T
1100°C to 1820°C
-150°C to 1000°C
-150°C to 1200°C
-100°C to 1200°C
-100°C to 1300°C
300°C to 1760°C
400°C to 1760°C
-100°C to 400°C
1.2°C
1.0°C
1.0°C
1.0°C
1.0°C
1.2°C
1.2°C
1.0°C
400°C to 1100°C
-200°C to -150°C
-210°C to -150°C
-200°C to -100°C
-200°C to -100°C
-50°C to 300°C
-50°C to 400°C
-200°C to -100°C
1.8°C
1.5°C
1.2°C
1.5°C
1.5°C
1.8°C
1.8°C
1.5°C
0.03°C
0.03°C
0.03°C
0.03°C
0.03°C
0.03°C
0.03°C
0.03°C
RTD R0 from 49Ω
to 2.1 kΩ
-200°C to 600°C 0.06°C0.003°C
Thermistor 2.2 k, 5 k, 10 k -80°C to 150°C 0.08°C0.002°C
[1] Specifications are for 1 hour warm up and 61⁄2 digits
[2] Relative to calibration standards
[3] 20% over range on all ranges except 300 Vdc and 1 Adc ranges
[4] Specifications are for 4-wire ohms function or 2-wire ohms using Scaling to remove the offset.
Without Scaling, add 1Ω additional error in 2-wire ohms function.
[5] 1 year accuracy. For total measurement accuracy, add temperature probe error.
[6] Thermocouple specifications not guaranteed when 34907A module is present
Chapter 1 Specifications
DC, Resistance, and Temperature Accuracy Specifications
16