Agilent Technologies U2741A Guia do Utilizador descarregar pdf (Página 69)

Measurement Tutorial 3

U2741A User’s Guide 51

Figure 3-2 Ground loop induced error

The best way to eliminate ground loops is to isolate the

digital multimeter from earth by not grounding the input

terminals. If the digital multimeter must be earth- referenced,

connect it and the device under test to the same common

ground point. Also connect the digital multimeter and device

under test to the same electrical outlet whenever possible.

= Lead Resistance

= digital multimeter Isolation

ground

= Voltage Drop or Ground Bus

> 10GΩ

ground

test

Meter

Ideal

Resistance

User's Guide.book Page 51 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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