Editing Dbm Measurement - Agilent Technologies 34450A 5½ Digit Multimeter User Manual

Editing dBm measurement

Select dBm option
dBm measurement
34450A User's Guide
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:
= 10 × Log
dBm
10
You can choose from several reference resistance values:
= 2 Ω, 4 Ω, 8 Ω, 16 Ω, 50 Ω, 75 Ω, 93 Ω, 110 Ω, 124 Ω,
R
REF
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.
Press to exit
You can view and select the reference value as described in
"Editing math functions reference values"
Functions and Features
2
[(Reading / R
)
REF
1
Ongoing measurement
Reference value
2
/ 0.001 Ω ]
2
Press to start
3
4
on page 42.
41