RIGOL DM3058 - Manual (Page 70)

RIGOL
User’s Guide for DM3058/DM3058E 2-48
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 mill watt.
Press  dBm, the display shows:
Figure 2-63 dBm setting
Table 2-18 dB Measurement Function Menu Function Description
Function Menu Settings Description
Default
Use the default value. The range of
parameter is 2Ω ~ 8000Ω.
ON
Open dBm Measurement.
Status bar shows “dBm”.
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 ]