Rigol DM3000 Series - Page 68

RIGOL
2-18 © Copyright RIGOL Technologies, Inc. 2007.
User Manual 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 Æ dBm , enter the menu shown below:
Figure 2-17
Table 2-14 dB Measurement Function Menu Function Explanation
Function Menu Explanation
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.
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