Rigol DM3058 Bedienungsanleitung PDF herunterladen (Seite 71)

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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.

Open dB Measurement.

Status bar shows “dB”.

Save all changes, back to a higher level

menu.

The computation method of the dB:

dB =10xLog

[(Reading

/ R

REF

) / 0.001W] – (dB setting value)

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.

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Rigol DM3058 Bedienungsanleitung Seite 71