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SIGLENT
68 SDM3055 Digital Multimeter
dBm
The dBm function is logarithmic and based on a calculation of power delivered
to a reference resistance, relative to 1 mill watt. Besides，this function only
applies to AC voltage and DC voltage measurements.
Press →【dB/dBm】→【On】and select【Function dBm】to enter the
interface shown in the following diagram.
Diagram 2- 60 dBm Function Interface
Table 2- 24 dB Measurement Function Menu Function Description
Function
Menu
Settings
Description
dB/dBm On/Off Turn on or turn off dB or dBm function.
Function
dBm
Open dBm function and the lower right corner of the
main display show “dBm”.
Ref R Set the parameter via direction keys: 50Ω ~ 8000Ω.
Done Save all changes and return to the higher level menu.
The computation method of the dBm:
When dBm function is turned on, the measured value of voltage is transformed
into dBm according to the following formula.
dBm = 10 x Log
10
[(Reading
2
/ R
REF
) / 0.001W]
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