Agilent Technologies 34450A Guia do Utilizador Página 99
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Measurement Tutorial 3
34450A User’s Guide 77
Noise Rejection
Rejecting Power- Line Noise Voltages
A desirable characteristic of integrating analog- to- digital
(A/D) converters is their ability to reject power- line related
noise present with DC input signals. This is called normal
mode noise rejection, or NMR. The multimeter achieves NMR
by measuring the average DC input by “integrating” it over a
fixed period.
Common Mode Rejection (CMR)
Ideally, a multimeter is completely isolated from
earth- referenced circuits. However, there is finite resistance
between the multimeter’s input LO terminal and earth
ground, as shown below. This can cause errors when
measuring low voltages which are floating relative to earth
ground.
Figure 3-1 Common Mode Rejection (CMR)
V
f
R
s
R
i
C
i
Ideal
Meter
V
f
=FloatVoltage
R
s
=DUTSourceResistance
Imbalance
R
i
= Multimeter Isolation Resistance
(LO-Earth)
C
i
= Multimeter Input Capacitance:
V
f
×R
s
Error (v) =
R
s
+R
i
HI
LO
V
test
- Keysight 34450A 5½ Digit 1
- Multimeter 1
- Safety Symbols 5
- Regulatory Markings 6
- General Safety Information 7
- VI 34450A User’s Guide 8
- Environmental Conditions 9
- 2002/96/EC 10
- Additional Notices 11
- In This Guide… 13
- XII 34450A User’s Guide 14
- Contents 15
- XIV 34450A User’s Guide 16
- 34450A User’s Guide XV 17
- XVI 34450A User’s Guide 18
- 34450A User’s Guide XVII 19
- XVIII 34450A User’s Guide 20
- Figures 20
- 34450A User’s Guide XIX 21
- XX 34450A User’s Guide 22
- Getting Started Tutorial 23
- The Front Panel at a Glance 24
- The display at a glance 25
- Single display screen 25
- Dual display screen 25
- 4 34450A User’s Guide 26
- 1 Getting Started Tutorial 26
- Getting Started Tutorial 1 27
- 34450A User’s Guide 5 27
- The Keypad at a Glance 28
- 34450A User’s Guide 7 29
- Feature Upgrades 31
- The Rear Panel at a Glance 32
- Making Measurements 33
- Digit masking 34
- (HI terminal) 35
- 14 34450A User’s Guide 36
- Measuring resistance 37
- 16 34450A User’s Guide 38
- 34450A User’s Guide 17 39
- 18 34450A User’s Guide 40
- 34450A User’s Guide 19 41
- Testing continuity 42
- Checking diodes 43
- Measuring temperature 44
- Measuring capacitance 45
- Selecting a Range 46
- Remote Operation 47
- Serial interface 48
- GPIB IEEE-488 (Optional) 49
- Code compatibility mode 50
- SCPI commands 50
- 30 34450A User’s Guide 52
- Functions and Features 53
- Math Operations 54
- Null measurement 55
- – Offset 56
- Hold measurement 57
- Limit measurement 58
- Accessing math menu 59
- Editing single statistics 60
- Editing all statistics 61
- Editing dB measurement 62
- Editing dBm measurement 63
- Math annunciators 64
- Editing values 65
- The Dual Display 66
- Using the dual display 67
- Using the Utility Menu 69
- 48 34450A User’s Guide 70
- 2 Functions and Features 70
- Functions and Features 2 71
- 34450A User’s Guide 49 71
- RS232 utility sub-menu 73
- 52 34450A User’s Guide 74
- GPIB Utility Sub-Menu 75
- Reading error messages 76
- The beeper 77
- Reset/Power-On State 80
- 34450A User’s Guide 59 81
- Triggering the Multimeter 82
- Software (Bus) Triggering 83
- External Trigger 84
- Trigger Out 84
- Manual Trigger 85
- Data Logging 87
- 34450A User’s Guide 67 89
- Viewing the log info 91
- Viewing the log list 92
- Viewing the log histogram 93
- Viewing the log statistics 94
- Measurement Tutorial 97
- DC Measurement Considerations 98
- Noise Rejection 99
- Noise Caused by Ground Loops 100
- Offset Compensation 107
- EMF) - VEMF = I*R 108
- True RMS AC Measurements 109
- AC Filter 112
- Frequency measurement errors 113
- DC current measurements 114
- Capacitance measurements 115
- Temperature measurements 117
- Loading Errors (AC volts) 118
- Measurements Below Full Scale 118
- Low- Level Measurement Errors 119
- Pulse Measurement Error 120
- Specifications 121
- Test Considerations 122
- DC Specifications 123
- 102 34450A User’s Guide 124
- 4 Specifications 124
- AC Specifications 125
- 104 34450A User’s Guide 126
- Specifications 4 127
- 34450A User’s Guide 105 127
- Operating Specifications 128
- 34450A User’s Guide 107 129
- 108 34450A User’s Guide 130
- 34450A User’s Guide 109 131
- 110 34450A User’s Guide 132
- 34450A User’s Guide 111 133
- General Characteristics 134
- 34450A User’s Guide 113 135
- Accuracy specifications 137
- DC voltage measurements 138
- Contact us 139
- *34450-90000* 140
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