RIGOL
User’s Guide for DM3058
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
The default value is dBm.
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:
You can either let the instrument automatically measure this value, or you can
enter a specified value.
Settings of dB value are stored in volatile storage.
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