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34 U2741A User’s Guide

2 Operation and Features

SCPI commands

The following example shows how to make an AC current

measurement using SCPI commands.

MEASure:CURRent:AC?

Measuring Resistance

The resistance measurement function has the following

features:

• Seven ranges to select: 100 Ω, 1 kΩ , 10 kΩ , 100 kΩ, 1

MΩ, 10 MΩ, and 100 MΩ or, auto- range.

• Supports two- wire and four- wire resistance measurement.

• Open circuit voltage is limited to less than 4.5 V on all

ranges.

The figure below shows a two- wire resistance measurement

connection.

Resistance

Te s t

Current

User's Guide.book Page 34 Friday, August 8, 2008 9:11 AM

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Agilent U2741A USB 1
Modular 5.5 Digits 1
Digital Multimeter 1
Safety Symbols 3
General Safety Information 4
Environmental Conditions 5
Regulatory Markings 6
2002/96/EC 7
In This Guide… 8
U2741A User’s Guide IX 9
X U2741A User’s Guide 10
Contents 11
XII U2741A User’s Guide 12
Temperature specifications 71 13
Product Characteristics 65 13
Product Specifications 67 13
Frequency specifications 70 13
XIV U2741A User’s Guide 14
List of Figures 15
XVI U2741A User’s Guide 16
List of Tables 17
XVIII U2741A User’s Guide 18
Getting Started 19
Introduction 20
Product at a Glance 21
4 U2741A User’s Guide 22
1Getting Started 22
Product Dimensions 23
Dimensions with Bumpers 24
Standard Purchase Items 25
Inspection and Maintenance 26
General Maintenance 27
Installation 28
A. Check Your System 29
C. Install the Module Driver 31
22 U2741A User’s Guide 40
24 U2741A User’s Guide 42
Instrument Configuration 43
Chassis Installation 44
Operation and Features 45
Powering Up 46
Making Measurements 47
SCPI commands 48
Measuring AC Voltage 49
Measuring DC Current 50
Measuring AC Current 51
Measuring Resistance 52
Measuring Frequency 54
Testing Continuity 55
Testing D iodes 56
Measuring Temperature 57
Restoring Instrument State 59
SCPI Commands 60
Default Settings 61
Triggering the U2741A 62
Star Triggering 63
SCPI command 63
Synchronization Status 63
System-Related Operation 64
Measurement Tutorial 65
DC Measurement Considerations 66
Noise Rejection 67
Noise caused by ground loops 68
Resistance Measurements 70
4-Wire Ohms Measurements 70
AC Measurements 73
Frequency Measurement Errors 76
DC Current Measurements 76
Loading errors (AC volts) 78
Measurements below full scale 78
Low-level measurement errors 79
Agilent Technologies 81
Product Characteristics 83
66 U2741A User’s Guide 84
Product Specifications 85
AC specifications 86
U2741A User’s Guide 69 87
Frequency specifications 88
Temperature specifications 89
72 U2741A User’s Guide 90

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