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Functions and Features 2
34450A User’s Guide 41
Editing dBm measurement
The logarithmic dBm (decibels relative to one milliwatt)
scale is often used in RF signal measurements. The
multimeter’s dBm operation takes a measurement and
calculates the power delivered to a reference resistance
(typically 50, 75, or 600 Ω). The formula used for conversion
from the voltage reading is:
dBm = 10 × Log
10
[(Reading
2
/ R
REF
) / 0.001 Ω ]
You can choose from several reference resistance values:
R
REF
= 2 Ω, 4 Ω, 8 Ω, 16 Ω, 50 Ω, 75 Ω, 93 Ω, 110 Ω, 124 Ω,
125 Ω, 135 Ω, 150 Ω, 250 Ω, 300 Ω, 500 Ω, 600 Ω, 800 Ω,
900 Ω, 1000 Ω, 1200 Ω, or 8000 Ω.
You can view and select the reference value as described in
“Editing math functions reference values” on page 42.
Select dBm option
dBm measurement
Ongoing measurement
Reference value
Press to exit
1
4
2
3
Press to start
34450A UG.book Page 41 Tuesday, July 23, 2013 2:43 PM
- Agilent 34450A 1
- 5½ Digit Multimeter 1
- Safety Symbols 3
- Regulatory Markings 4
- General Safety Information 5
- VI 34450A User’s Guide 6
- Environmental Conditions 7
- 2002/96/EC 8
- Additional Notices 9
- In This Guide… 11
- XII 34450A User’s Guide 12
- Contents 13
- XIV 34450A User’s Guide 14
- 34450A User’s Guide XV 15
- XVI 34450A User’s Guide 16
- 34450A User’s Guide XVII 17
- XVIII 34450A User’s Guide 18
- Figures 18
- 34450A User’s Guide XIX 19
- XX 34450A User’s Guide 20
- Getting Started Tutorial 21
- The Front Panel at a Glance 22
- The display at a glance 23
- Single display screen 23
- Dual display screen 23
- 4 34450A User’s Guide 24
- 1 Getting Started Tutorial 24
- Getting Started Tutorial 1 25
- 34450A User’s Guide 5 25
- The Keypad at a Glance 26
- 34450A User’s Guide 7 27
- Feature Upgrades 29
- The Rear Panel at a Glance 30
- Making Measurements 31
- Digit masking 32
- (HI terminal) 33
- 14 34450A User’s Guide 34
- Measuring resistance 35
- 16 34450A User’s Guide 36
- 34450A User’s Guide 17 37
- 18 34450A User’s Guide 38
- 34450A User’s Guide 19 39
- Testing continuity 40
- Checking diodes 41
- Measuring temperature 42
- Measuring capacitance 43
- Selecting a Range 44
- Remote Operation 45
- Serial interface 46
- GPIB IEEE-488 (Optional) 47
- Code compatibility mode 48
- SCPI commands 48
- 30 34450A User’s Guide 50
- Functions and Features 51
- Math Operations 52
- Null measurement 53
- – Offset 54
- Hold measurement 55
- Limit measurement 56
- Accessing math menu 57
- Editing single statistics 58
- Editing all statistics 59
- Editing dB measurement 60
- Editing dBm measurement 61
- 9 Offset Value 62
- Editing values 63
- The Dual Display 64
- Using the dual display 65
- Using the Utility Menu 67
- 2 Functions and Features 68
- 48 34450A User’s Guide 68
- Functions and Features 2 69
- 34450A User’s Guide 49 69
- RS232 utility sub-menu 71
- 52 34450A User’s Guide 72
- GPIB Utility Sub-Menu 73
- Reading error messages 74
- The beeper 75
- Reset/Power-On State 78
- 34450A User’s Guide 59 79
- Triggering the Multimeter 80
- Software (Bus) Triggering 81
- External Trigger 82
- Tri gger Out 82
- Manual Trigger 83
- Data Logging 85
- 34450A User’s Guide 67 87
- Viewing the log info 89
- Viewing the log list 90
- Viewing the log histogram 91
- Viewing the log statistics 92
- Measurement Tutorial 95
- DC Measurement Considerations 96
- Noise Rejection 97
- Noise Caused by Ground Loops 98
- Offset Compensation 105
- EMF) - VEMF = I*R 106
- True RMS AC Measurements 107
- AC Filter 110
- Frequency measurement errors 111
- DC current measurements 112
- Capacitance measurements 113
- Temperature measurements 115
- Loading Errors (AC volts) 116
- Measurements Below Full Scale 116
- Low- Level Measurement Errors 117
- Pulse Measurement Error 118
- Specifications 119
- Test Considerations 120
- DC Specifications 121
- 102 34450A User’s Guide 122
- 4 Specifications 122
- AC Specifications 123
- 104 34450A User’s Guide 124
- Specifications 4 125
- 34450A User’s Guide 105 125
- Operating Specifications 126
- 34450A User’s Guide 107 127
- 108 34450A User’s Guide 128
- 34450A User’s Guide 109 129
- 110 34450A User’s Guide 130
- 34450A User’s Guide 111 131
- General Characteristics 132
- 34450A User’s Guide 113 133
- Accuracy specifications 135
- DC voltage measurements 136
- Agilent Technologies 137
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