OPERATION
17/11/2016 Version No. 002
63
dBm/dB/W Measurement
dBm/dB Calculation
Overview
Using the ACV or DCV measurement results, the DMM
calculates the dB or dBm value based on a reference
resistance value in the following way:
dBm= 10 x log
10
(1000 x Vreading
2
/ Rref)
dB= dBm
– dBmref
W= Vreading
2
/Rref
Where:
Vreading= Input Voltage, ACV or DCV;
Rref= Reference resistance simulating an output load;
dBmref= Reference dBm value
Measuring dBm/W
Procedure
1. Select ACV or DCV measurement. See page 31.
2. To measure dBm, press SHIFT
→ MENU(dBm)
The primary display will show the dBm measurement while the
secondary display shows the reference resistance.
