RIGOL DM3058 - Manual (Page 71)

RIGOL
User’s Guide for DM3058/DM3058E 2-49
dB Measurement
The dB function applies to AC voltage and DC voltage measurements only.
Each dB measurement is different between the input signal and a stored relative
value, with both values converted to dBm.
Press
 dB, enter the menu shown below:
Figure 2-64 dB Setting
Table 2-19 dB Measurement Function Menu Function Description
Function Menu Settings Description
Default The default value is 0 dBm.
ON
Open dB Measurement.
Status bar shows “dB”.
Save all changes, back to a higher level
menu.
The computation method of the dB:
dB =10xLog
10
[(Reading 2 / R
REF
) / 0.001W] – (dB setting value)
R
REF
expressed measuring the resistance value in the actual electric circuit.
Range of the dB setting value: -120 dBm ~ +120 dBm. The default is 0 dBm.
NOTE:
 Input a value in dB setting interface by direction button, and then store
it as dB setting value.
 Settings of dB value are stored in volatile memory.