RIGOL
© 2007 RIGOL Technologies, Inc.
User‟s Guide for DM3000 Series
4. dBm Measurement
This function applies to AC voltage and DC voltage measurements only.
The dBm function is logarithmic, and is based on a calculation of power delivered to
a reference resistance, relative to 1 milliwatt.
Press dBm, the display shows:
Figure 2- 17
Table 2- 14 dB Measurement Function Menu Function Description
The computation method of the dBm:
dBm = 10 x Log
10
[ (Reading
2
/ R
REF
) / 0.001W ]
R
REF
expressed measuring the resistance value in the actual electric circuit.
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