GW Instek GDM-8261A - dBm;dB;W Measurement

GDM-8261A User Manual
58
dBm/dB/W Measurement
Applicable to
ACV
DCV
Background
Using the ACV or DCV measurement result, the
GDM-8261A calculates the dB, dBm or W value based
on a reference resistance value in the following way.
dBm
10 x log10 (1000 x Vreading
2
/ Rref)
dB
dBm – dBmref
W
Vreading
2/
Ref
Parameters
Vreading
Input Voltage, ACV or DCV
Rref
Reference resistance simulating an
output load
dBmref
Reference dBm value
Measure dBm/W
Activate dBm
Press the Shift key followed by the
/
key. The 1st display shows
dBm, and the 2nd display shows the
reference resistance.
/ EXITSHIFT
/
dBm
dBm result
appears
W
dB
SDC
m
dBm
Indicates dBm measurement
600Ω
2nd display indicates the reference
resistance
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