The Dbm Operation; Db Operation - UNI-T UT8805E Manual

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.
→ [dBm] → [On] to enter the interface of Figure 2-44.
Press
Menu of dBm operation
Function menu Options
dBm On/Off
Resist
Done
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.
→ [dB] → [On] to enter the interface of Figure 2-45.
Press
Menu of dB operation
Function
Options
menu
dB On/Off
Resist
Figure 2-44 Interface of dBm operation
Description
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
Figure 2-45 Interface of dB operation
Description
Turn the dB function on or off
Can be set by direction buttons in the range of 50Ω
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UT8805E Benchtop Digital Multimeter