Keysight 34401A User manual

Keysight 34401A
6½ Digit Multimeter
Service
Guide

34401A Service Guide
Notices
© Agilent Technologies, Inc. 1991 - 2012
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 Agilent Technologies, Inc. as
governed by United States and international
copyright laws.
Manual Part Number
34401-90013
Edition
Eighth Edition. May 2012
Printed in Malaysia
Agilent Technologies, Inc.
3501 Stevens Creek Blvd. Santa
Clara, CA 95052 USA
Microsoft® and Windows® are U.S. registered
trademarks of Microsoft Corporation.
Software Revision
This guide is valid for the firmware that was
installed in the instrument at the time of
manufacture. However, upgrading the firmware
may add or change product features.
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, Agilent 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. Agilent
shall not be liable for errors or for
incidental or consequential damages in
connection with the furnishing, use, or
performance of this document or of
any information contained herein.
Should Agilent and the user have a
separate written agreement with
warranty terms covering the material in
this document that conflict with these
terms, the warranty terms in the
separate agreement shall control.
Technology Licenses
The hardware and/or software described in this
document are furnished under a license and
may be used or copied only in accordance with
the terms of such license.
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and technical data rights granted to the federal
government include only those rights
customarily provided to end user customers.
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license in Software and technical data pursuant
to FAR 12.211 (Technical Data) and 12.212
(Computer Software) and, for the Department
of Defense, DFARS 252.227-7015 (Technical
Data - Commercial Items) and DFARS
227.7202-3 (Rights in Commercial Computer
Software or Computer Software
Documentation).
Safety Notices
CAUTION
A CAUTION notice denotes a hazard.
It calls attention to an operating
procedure, practice, or the like that, if
not correctly performed or adhered to,
could result in damage to the product
or loss of important data. Do not
proceed beyond a CAUTION notice
until the indicated conditions are fully
understood and met.
WARNING
A WARNING notice denotes a
hazard. It calls attention to an
operating procedure, practice, or
the like that, if not correctly
performed or adhered to, could
result in personal injury or death.
Do not proceed beyond a
WARNING notice until the
indicated conditions are fully
understood and met.

34401A Service Guide iii
Safety Information
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.
Do not install substitute parts or perform any
unauthorized modification to the product.
Return the product to an Agilent Technologies
Sales and Service Office for service and repair
to ensure that safety features are maintained.
Ground the Instrument
If your product is 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.
Cleaning
Clean the outside of the instrument with a soft,
lint-free, slightly dampened cloth. Do not use
detergent or chemical solvents.
Safety Symbols WARNING
Main Power and Test Input
Disconnect: Unplug instrument
from wall outlet, remove power
cord, and remove all probes from
all terminals before servicing. Only
qualified, service-trained
personnel should remove the
cover from the instrument.
WARNING
Line and Current Protection
Fuses: For continued protection
against fire, replace the line fuse
and the current-protection fuse
only with fuses of the specified
type and rating.
WARNING
Front/Rear Switch: Do not change
the position of the
Front/Rear switch on the front
panel while signals are present on
either the front or rear set of
terminals. The switch is not
intended as an active multiplexer.
Switching while high voltages or
currents are present may cause
instrument damage and lead to the
risk of electric shock.
Earth Ground
Chassis Ground
Risk of electric shock
Refer to manual for additional
safety information
Alternating Current
On supply
Off supply
‘In’ position of bi-stable push switch
‘Out’ position of bi-stable push
switch
CAT II (300V)
IEC Measurement Category II.
Inputs may be connected to
mains (up to 300 VAC) under
Category II overvoltage
conditions.

iv 34401A Service Guide
WARNING
IEC Measurement Category II. The
HI and LO input terminals may be
connected to mains in IEC
Category II installations for line
voltages up to 300 VAC. To avoid
the danger of electric shock, do
not connect the inputs to mains for
line voltages above 300 VAC. See
"IEC Measurement Category II
Overvoltage Protection" on the
following page for further
information.
WARNING
Protection Limits: To avoid
instrument damage and the risk of
electric shock, do not exceed any
of the Protection Limits defined in
the following section.
Protection Limits
The Agilent 34401A Digital Multimeter provides
protection circuitry to prevent damage to the
instrument and to protect against the danger of
electric shock, provided the Protection Limits
are not exceeded. To ensure safe operation of
the instrument, do not exceed the Protection
Limits shown on the front and rear panel, and
defined as follows:
Note: The front-panel terminals are shown
above. The rear-panel terminals are identical.
The Front/Rear switch selects the terminal set
to be used. Do not operate this switch while
signals are present on the front or rear
terminals. The current-protection fuse is on
the rear panel.
Input Terminal Protection
Limits
Protection Limits are defined for the input
terminals:
Main Input (HI and LO) Terminals. The HI
and LO input terminals are used for voltage,
resistance, frequency (period), and diode test
measurements. Two Protection Limits are
defined for these terminals:
HI to LO Protection Limit. The Protection
Limit from HI to LO (Input terminals) is 1000
VDC or 750 VAC, which is also the
maximum voltage measurement. This limit
can also be expressed as 1000 Vpk
maximum.
LO to Ground Protection Limit. The LO
input terminal can safely "float" a
maximum of 500 Vpk relative to ground.
As is implied by the above limits, the Protection
Limit for the HI input terminal is a maximum of
1500 Vpk relative to ground.
Current Input Terminal. The current input
("I") terminal has a Protection Limit of 3A
(rms) maximum current flowing from the LO
input terminal. Note that the current input
terminal will be at approximately the same
voltage as the LO terminal.
Note: The current-protection circuitry includes
a fuse on the rear panel. To maintain
protection, replace this fuse only with a fuse of
the specified type and rating.
Sense Terminal Protection
Limits
The HI and LO sense terminals are used only
for four-wire resistance and temperature
measurements ("Ω 4W"). The Protection Limit
is 200 Vpk for all of the terminal pairings:
LO sense to LO input
HI sense to LO input
HI sense to LO sense
Note: The 200 Vpk limit on the sense
terminals is the Protection Limit. Operational
voltages in resistance measurements are
much lower — less than 10 V in normal
operation.
IEC Measurement Category II
Overvoltage Protection
To protect against the danger of electric shock,
the Agilent 34401A Digital Multimeter provides
overvoltage protection for line-voltage mains
connections meeting both of the following
conditions:
The HI and LO input terminals are connected
to the mains under Measurement Category II
conditions, defined below,
and
The mains are limited to a maximum line
voltage of 300 VAC.

34401A Service Guide v
IEC Measurement Category II includes
electrical devices connected to mains at an
outlet on a branch circuit. Such devices include
most small appliances, test equipment, and
other devices that plug into a branch outlet or
socket. The 34401A may be used to make
measurements with the HI and LO inputs
connected to mains in such devices, or to the
branch outlet itself (up to 300 VAC). However,
the 34401A may not be used with its HI and LO
inputs connected to mains in permanently
installed electrical devices such as the main
circuit-breaker panel,
sub-panel disconnect boxes, or permanently
wired motors. Such devices and circuits are
subject to overvoltages that may exceed the
protection limits of the 34401A.
Note: Voltages above 300 VAC may be
measured only in circuits that are isolated from
mains. However, transient overvoltages are
also present on circuits that are isolated from
mains. The Agilent 34401A are designed to
safely withstand occasional transient
overvoltages up to 2500 Vpk. Do not use this
equipment to measure circuits where transient
overvoltages could exceed this level.
Additional Notices
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 Agilent office, or see
www.agilent.com/environment/product for
more information.
Agilent 34138A Test Lead Set
The Agilent 34401A is compatible with the
Agilent 34138A Test Lead Set described
below.
Test Lead Ratings
Test Leads - 1000V, 15A
Fine Tip Probe Attachments - 300V, 3A
Mini Grabber Attachment - 300V, 3A
SMT Grabber Attachments - 300V, 3A
Operation
The Fine Tip, Mini Grabber, and SMT Grabber
attachments plug onto the probe end of the
Test Leads.
Maintenance
If any portion of the Test Lead Set is worn or
damaged, do not use. Replace with a new
Agilent 34138A Test Lead Set.
WARNING
If the Test Lead Set is used in a
manner not specified by Agilent
Technologies, the protection
provided by the Test Lead Set may
be impaired. Also, do not use a
damaged or worn Test Lead Set.
Instrument damage or personal
injury may result.

DECLARATION OF CONFORMITY
According to ISO/IEC Guide 22 and CEN/CENELEC EN 45014
Revision: B.01 Issue Date: 18 July 2001 Document 34401A.DOC
Manufacturer’s Name: Agilent Technologies, Incorporated
Manufacturer’s Address: 815 – 14th St. SW
Loveland, Colorado 80537
USA
Declares, that the product
Product Name: Multimeter
Model Number: 34401A
Product Options: This declaration covers all options of the above product(s).
Conforms with the following European Directives:
The product herewith complies with the requirements of the Low Voltage Directive 73/23/EEC and the EMC Directive 89/336/EEC
(including 93/68/EEC) and carries the CE Marking accordingly.
Conforms with the following product standards:
EMC Standard
IEC 61326-1:1997+A1:1998 / EN 61326-1:1997+A1:1998
CISPR 11:1990 / EN 55011:1991
IEC 61000-4-2:1995+A1:1998 / EN 61000-4-2:1995
IEC 61000-4-3:1995 / EN 61000-4-3:1995
IEC 61000-4-4:1995 / EN 61000-4-4:1995
IEC 61000-4-5:1995 / EN 61000-4-5:1995
IEC 61000-4-6:1996 / EN 61000-4-6:1996
IEC 61000-4-11:1994 / EN 61000-4-11:1994
Canada: ICES-001:1998
Australia/New Zealand: AS/NZS 2064.1
Limit
Group 1 Class A
4kV CD, 8kV AD
3 V/m, 80-1000 MHz
0.5kV signal lines, 1kV power lines
0.5 kV line-line, 1 kV line-ground
3V, 0.15-80 MHz
Dips: 30% 10ms; 60% 100ms
Interrupt > 95%@5000ms
The product was tested in a typical configuration with Agilent Technologies test systems.
Safety IEC 61010-1:1990+A1:1992+A2:1995 / EN 61010-1:1993+A2:1995
Canada: CSA C22.2 No. 1010.1:1992
UL 3111-1: 1994
18 July 2001
Date Ray Corson
Product Regulations Program Manager
For further information, please contact your local Agilent Technologies sales office, agent or distributor.
Authorized EU-representative: Agilent Technologies Deutschland GmbH, Herrenberger Straβe 130, D 71034 Böblingen, Germany

Note: Unless otherwise indicated, this manual applies to all serial numbers.
The Agilent Technologies 34401A is a 61⁄2-digit, high-performance
digital multimeter. Its combination of bench-top and system features
makes this multimeter a versatile solution for your measurement needs
now and in the future.
Convenient Bench-Top Features
•Highly visible vacuum-fluorescent display
•Built-in math operations
•Continuity and diode test functions
•Hands-free, Reading Hold feature
•Portable, ruggedized case with non-skid feet
Flexible System Features
•GPIB (IEEE-488) interface and RS-232 interface
•Standard programming languages: SCPI, Agilent 3478A, and
Fluke 8840
•Reading rates up to 1000 readings per second
•Storage for up to 512 readings
•Limit testing with pass/fail signals
•Optional 34812A IntuiLink/Meter Software
for Microsoft® WindowsTM
Warning The procedures in this manual are intended for use by qualified,
service-trained personnel only.
Agilent 34401A
Multimeter
Page 1 (Service Guide)

The Front Panel at a Glance
1 Measurement Function keys
2 Math Operation keys
3 Single Trigger / Autotrigger / Reading Hold key
4 Shift / Local key
5 Front / Rear Input Terminal Switch
6 Range / Number of Digits Displayed keys
7 Menu Operation keys
2

The Front-Panel Menu at a Glance
A: MEASurement MENU
1: AC FILTER > 2: CONTINUITY > 3: INPUT R > 4: RATIO FUNC > 5: RESOLUTION
F: CALibration MENU*
1: SECURED > [ 1: UNSECURED ] > [ 2: CALIBRATE ] > 3: CAL COUNT > 4: MESSAGE
*The commands enclosed in square brackets ( [ ] ) are “hidden” unless the multimeter
is UNSECURED for calibration.
B: MATH MENU
1: MIN-MAX > 2: NULL VALUE > 3: dB REL > 4: dBm REF R > 5: LIMIT TEST > 6: HIGH LIMIT > 7: LOW LIMIT
C: TRIGger MENU
1: READ HOLD > 2: TRIG DELAY > 3: N SAMPLES
D: SYStem MENU
1: RDGS STORE > 2: SAVED RDGS > 3: ERROR > 4: TEST > 5: DISPLAY > 6 : BEEP > 7: COMMA > 8 : REVISION
E: Input / Output MENU
1: HP-IB ADDR > 2: INTERFACE > 3: BAUD RATE > 4: PARITY > 5: LANGUAGE
The menu is organized in a top-down tree structure with three levels.
3

Display Annunciators
Adrs
Rmt
Man
Trig
Hold
Mem
Ratio
Math
ERROR
Rear
Shift
4W
Turns on during a measurement.
Multimeter is addressed to listen or talk over the GPIB interface.
Multimeter is in remote mode (remote interface).
Multimeter is using manual ranging (autorange is disabled).
Multimeter is waiting for a single trigger or external trigger.
Reading Hold is enabled.
Turns on when reading memory is enabled.
Multimeter is in dcv:dcv ratio function.
A math operation is enabled (null, min-max, dB, dBm, or limit test).
Hardware or remote interface command errors are detected.
Rear input terminals are selected.
“Shift” key has been pressed. Press “Shift” again to turn off.
Multimeter is in 4-wire ohms function.
Multimeter is in continuity test function.
Multimeter is in diode test function.
To review the display annunciators, hold down the Shift key as you
turn on the multimeter.
∗
4

The Rear Panel at a Glance
1 Chassis Ground
2 Power-Line Fuse-Holder Assembly
3 Power-Line Voltage Setting
4 Front and Rear Current Input Fuse
5 Voltmeter Complete Output Terminal
6 External Trigger Input Terminal
7 GPIB (IEEE-488) Interface connector
8 RS-232 interface connector
Use the front-panel Input / Output Menu to:
•Select the GPIB or RS-232 interface (see chapter 4 in the “User’s Guide”).
•Set the GPIB bus address (see chapter 4 in the “User’s Guide”).
•Set the RS-232 baud rate and parity (see chapter 4 in the “User’s Guide”).
5

In This Book
Specifications Chapter 1 lists the multimeter’s specifications and
describes how to interpret these specifications.
Quick Start Chapter 2 prepares the multimeter for use and helps you
get familiar with a few of its front-panel features.
Menu Tutorial Chapter 3 introduces you to the front-panel menu and
steps you through several simple menu examples.
Calibration Procedures Chapter 4 provides a detailed description of
the multimeter’s calibrations and adjustments.
Theory of Operation Chapter 5 describes each functional block in the
multimeter.
Service Chapter 6 provides guidelines for returning your multimeter
to Agilent for servicing, or for servicing it yourself.
Replaceable Parts Chapter 7 contains a detailed parts list of the
multimeter.
Backdating Chapter 8 describes the procedures involved with back
issues of this manual.
Schematics Chapter 9 provides the multimeter’s schematics.
6

Contents
Chapter 1 Specifications
DC Characteristics 12
AC Characteristics 14
Frequency and Period Characteristics 16
General Information 18
Product Dimensions 19
To Calculate Total Measurement Error 20
Interpreting Multimeter Specifications 22
Configuring for Highest Accuracy Measurements 25
Chapter 2 Quick Start
To Prepare the Multimeter for Use 29
If the Multimeter Does Not Turn On 30
To Adjust the Carrying Handle 32
To Measure Voltage 33
To Measure Resistance 33
To Measure Current 34
To Measure Frequency (or Period) 34
To Test Continuity 35
To Check Diodes 35
To Select a Range 36
To Set the Resolution 37
To Make Null (Relative) Measurements 38
To Store Minimum and Maximum Readings 39
To Make dB Measurements 40
To Make dBm Measurements 41
To Trigger the Multimeter 42
To Make dcv:dcv Ratio Measurements 43
Front-Panel Display Formats 44
To Rack Mount the Multimeter 45
Chapter 3 Menu Tutorial
Front-Panel Menu Reference 49
A Front-Panel Menu Tutorial 51
Menu Examples 53
Contents
7

Chapter 4 Calibration Procedures
Agilent Calibration Services 61
Calibration Interval 61
Time Required for Calibration 61
Automating Calibration Procedures 62
Recommended Test Equipment 63
Test Considerations 64
Performance Verification Tests 65
Zero Offset Verification 67
Gain Verification 69
Optional AC Performance Verification Tests 72
Calibration Security Code 73
Calibration Count 75
Calibration Message 75
Calibration Procedures 76
Aborting a Calibration in Progress 76
Zero Adjustment 77
Gain Adjustment 79
Optional Gain Calibration Procedures 82
Understanding the AC Signal Filter 85
Understanding Resolution 86
Error Messages 89
Chapter 5 Theory of Operation
Block Diagram 93
Front/Rear Selection 94
Function Switching 95
DC Amplifier 96
Ohms Current Source 98
AC Circuit 99
A-to-D Converter 101
Floating Logic 103
Earth-Referenced Logic 105
Power Supplies 106
Front Panel 107
Contents
Contents
8

Chapter 6 Service
Operating Checklist 111
Types of Service Available 112
Repackaging for Shipment 113
Electrostatic Discharge (ESD) Precautions 114
Surface Mount Repair 114
To Replace the Power-Line Fuse 114
To Replace The Current Input Fuses 115
To Connect Pass/Fail Output Signals 115
Troubleshooting Hints 117
Self-Test Procedures 120
Chapter 7 Replaceable Parts
To Order Replaceable Parts 126
Backdating and Part Changes 126
Replaceable Parts: 34401-66501 (Main Assembly) 127
Replaceable Parts: 34401-66512 (Display Assembly) 133
Replaceable Parts: Agilent 34401A Mainframe 134
Manufacturer’s List 135
Chapter 8 Backdating 137
Chapter 9 Schematics
Mechanical Disassembly 9-3
Component Locator Diagram – Main Board (34401-66501) 9-5
Component Locator Diagram – Front Panel (34401-66512) 9-6
Agilent 34401A Block Diagram 9-7
Front/Rear Selection Schematic 9-8
Function Switching Schematic 9-9
DC Amplifier and Ohms Schematic 9-10
AC Circuit Schematic 9-11
A/D Converter Schematic 9-12
Floating Logic Schematic 9-13
Earth-Referenced Logic Schematic 9-14
Power Supplies Schematic 9-15
Front-Panel Display Schematic 9-16
Contents
Contents
9

Contents
10

1
Specifications
1

DC Characteristics
DC Characteristics
Accuracy Specifications ± ( % of reading + % of range ) [ 1 ]
Function Range [ 3 ]
Test Current or
Burden Voltage 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
1000.000 V
0.0030 + 0.0030
0.0020 + 0.0006
0.0015 + 0.0004
0.0020 + 0.0006
0.0020 + 0.0006
0.0040 + 0.0035
0.0030 + 0.0007
0.0020 + 0.0005
0.0035 + 0.0006
0.0035 + 0.0010
0.0050 + 0.0035
0.0040 + 0.0007
0.0035 + 0.0005
0.0045 + 0.0006
0.0045 + 0.0010
0.0005 + 0.0005
0.0005 + 0.0001
0.0005 + 0.0001
0.0005 + 0.0001
0.0005 + 0.0001
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
1 mA
100 µA
10 µA
5 µA
500 nA
500 nA || 10 MΩ
0.0030 + 0.0030
0.0020 + 0.0005
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 10.00000 mA
100.0000 mA
1.000000 A
3.000000 A
< 0.1 V
< 0.6 V
< 1 V
< 2 V
0.005 + 0.010
0.01 + 0.004
0.05 + 0.006
0.10 + 0.020
0.030 + 0.020
0.030 + 0.005
0.080 + 0.010
0.120 + 0.020
0.050 + 0.020
0.050 + 0.005
0.100 + 0.010
0.120 + 0.020
0.002 + 0.0020
0.002 + 0.0005
0.005 + 0.0010
0.005 + 0.0020
Continuity 1000.0 Ω1 mA 0.002 + 0.030 0.008 + 0.030 0.010 + 0.030 0.001 + 0.002
Diode Test
[12] 1.0000 V 1 mA 0.002 + 0.010 0.008 + 0.020 0.010 + 0.020 0.001 + 0.002
DC:DC Ratio 100 mV
to
1000 V
( Input Accuracy ) + ( Reference Accuracy )
Input Accuracy = accuracy specification for the HI-LO input signal.
Reference Accuracy = accuracy specification for the HI-LO reference input signal.
Transfer Accuracy ( typical )
(24 hour % of range error )
2
Conditions:
 Within 10 minutes and ± 0.5°C.
 Within ±10% of initial value.
 Following a 2-hour warm-up.
 Fixed range between 10% and 100% of full scale.
 Using 61⁄2 digit slow resolution ( 100 PLC ).
 Measurements are made using accepted metrology practices.
24 Hour [ 2 ]
23°C ±1°C
Chapter 1 Specifications
12

DC Characteristics
Function
DCV, DCI, and
Resistance
Digits
61⁄2
61⁄2
51⁄2
51⁄2
41⁄2
Readings/s
0.6 (0.5)
6 (5)
60 (50)
300
1000
Additional
Noise Error
0% of range
0% of range
0.001% of range
0.001% of range
0.01% of range
System Speeds [ 9 ]
Function Change
Range Change
Autorange Time
ASCII readings to RS-232
ASCII readings to GPIB
Max. Internal Trigger Rate
Max. External Trigger Rate to Memory
Max. External Trigger Rate to GPIB
26/sec
50/sec
<30 ms
55/sec
1000/sec
1000/sec
1000/sec
900/sec
Operating Characteristics [ 8 ]
[10]
[10]
Measurement Noise Rejection
60 Hz ( 50 Hz ) [ 5 ]
DC CMRR
Integration Time
100 PLC / 1.67s (2s)
10 PLC / 167 ms (200 ms)
1 PLC / 16.7 ms (20 ms)
0.2 PLC / 3 ms (3 ms)
0.02 PLC / 400 µs (400 µs)
140 dB
Normal Mode Rejection [ 6 ]
60 dB [ 7 ]
60 dB [ 7 ]
60 dB [ 7 ]
0 dB
0 dB
[12] Accuracy specifications are for the voltage measured at
the input terminals only. 1mA test current is typical. Variation
in the current source will create some variation in the voltage
drop across a diode junction.
DC Voltage
Measurement Method:
A/D Linearity:
Input Resistance:
0.1 V, 1 V, 10 V ranges
100 V, 1000 V ranges
Input Bias Current:
Input Terminals:
Input Protection:
Resistance
Measurement Method:
Max. Lead Resistance:
(4-wire ohms)
Input Protection:
DC Current
Shunt Resistor:
Input Protection:
Continuity / Diode Test
Response Time:
Continuity Threshold:
DC:DC Ratio
Measurement Method:
Input HI-LO
Reference HI-Input LO
Input to Reference
Continuously integrating, multi-slope III
A/D converter.
0.0002% of reading + 0.0001% of range
Selectable 10 MΩ or >10 GΩ [11]
10 MΩ ±1%
< 30 pA at 25°C
Copper alloy
1000 V on all ranges
Selectable 4-wire or 2-wire ohms.
Current source referenced to LO input.
10% of range per lead for 100 Ω, 1 kΩ
ranges. 1 kΩ per lead on all other ranges.
1000 V on all ranges
0.1Ω for 1A, 3A. 5Ω for 10 mA, 100 mA
Externally accessible 3A, 250 V fuse
Internal 7A, 250 V fuse
300 samples/sec with audible tone
Adjustable from 1 Ω to 1000 Ω
Input HI-LO / Reference HI-LO
100 mV to 1000 V ranges
100 mV to 10 V ranges (autoranged)
Reference LO to Input LO voltage < 2 V
Reference HI to Input LO voltage < 12V
Measuring Characteristics
Autozero OFF Operation
Following instrument warm-up at calibration temperature ±1°C
and <10 minutes, add 0.0002% range additional error + 5 µV.
Settling Considerations
Reading settling times are affected by source impedance,
cable dielectric characteristics, and input signal changes.
Measurement Considerations
Agilent recommends the use of PTFE â or other high-impedance,
low-dielectric absorption wire insulation for these measurements.
[ 1 ] Specifications are for 1-hour warm-up at 61⁄2 digits.
[ 2 ] Relative to calibration standards.
[ 3 ] 20% overrange on all ranges, except 1000 Vdc, 3 A range.
[ 4 ] Specifications are for 4-wire ohms function, or 2-wire
ohms using Math Null. Without Math Null, add 0.2 Ω
additional error in 2-wire ohms function.
[ 5 ] For 1 kΩ unbalance in LO lead.
[ 6 ] For power-line frequency ± 0.1%.
[ 7 ] For power-line frequency ± 1%, subtract 20 dB.
For ± 3%, subtract 30 dB.
[ 8 ] Readings speeds for 60 Hz and ( 50 Hz ) operation,
Autozero Off.
[ 9 ] Speeds are for 41⁄2 digits, Delay 0, Autozero OFF,
and Display OFF. Includes measurement and data
transfer over GPIB.
[ 10 ] Add 20 µV for dc volts, 4 µA for dc current, or
20 mΩ for resistance.
[ 11 ] For these ranges, inputs beyond ±17V are
clamped through 100 kΩ (typical).
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Chapter 1 Specifications
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