The Relative Operation - UNI-T UT8805E Manual

dB Rel
Done
The operating method of dB
In dB operation, the instrument will work out the dBm value of next reading, and count the deference
between this dBm value and the saved set dB value, as formula shown below:
dB = 10xLog10 [(Reading2/RREF)/0.001W] - dB relative value
The set range of dB is -200 dBm ~ +200 dBm. The default dB value is 0dBm.
The dB relative value
Input a value in operating interface by direction button and save it as dB relative value.
The dB relative value is saved in volatile memory, and will be auto deleted after power off.

2.8.5 The Relative Operation

The relative operation is applied to relative measurement. The reading is the difference between the
measuring value and the set value.
→ [Relatively] → [On] to enter the interface of Figure 2-46.
Press
Menu of relative operation
Function menu
Relatively
Relatively
Done
The relative operating method:
The result of relative measurement will be displayed in relative operation.
The primary measurement value = measured value – set value
Relative operation is allowed in the measurements of DC/AC voltage, DC/AC current, resistance,
frequency, cycle, capacitance and temperature.
~ 8000Ω
Set the relative value of dB
Save current settings and return to previous menu
Figure 2-46 Interface of relative operation
Options Description
On/Off Turn the relative function on or off
Can be set by direction buttons
Save current settings and return to previous menu
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UT8805E Benchtop Digital Multimeter