UT8805E Benchtop Digital Multimeter
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2.8.3 The dBm Operation
dBm is an decibel unit represents the absolute value of power, and is relative to 1mW. The dBm operation
is to work out the power of reference resistance by measured voltage. The dBm operation is only suitable
for AC/DC voltage measurement.
Press → [dBm] → [On] to enter the interface of Figure 2-44.
Figure 2-44 Interface of dBm operation
Menu of dBm operation
Turn the dBm function on or off
Can be set by direction buttons in the range of 1Ω~8000Ω
Save current settings and return to previous menu
The operating method of dBm
In dBm operation, the measured voltage can be transferred to dBm value by formula below:
dBm = 10 x Log10 [(Reading2/RREF)/0.001W]
2.8.4 dB Operation
dB represents relative value and is applied to the relative operation of dBm. The dB operation is only
suitable for AC/DC voltage measurement.
Press → [dB] → [On] to enter the interface of Figure 2-45.
Figure 2-45 Interface of dB operation
Menu of dB operation
Turn the dB function on or off
Can be set by direction buttons in the range of 50Ω
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