RIGOL M300 - Manual (Page 65)

RIGOL
© 2007 RIGOL Technologies, Inc.
User’s Guide for DM3000 Series
2-17
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- 14 dBm Measurement
Table 2- 14 dB Measurement Function Menu Function Description
Function
Menu
Description
Default Use the default value.
Save all changes, back to a higher level menu.
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.