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36
Fig.3.10 Amplitude menu
1) Reference Level
Reference level is display on the up-left of the screen, which is signed as “ Ref ” . The default value of “ Ref ” is
98.8dBµV.
NOTE:
The smallest value of reference value is changed according to the different attenuator setting. The details will
be introduced in next section.
User can set the unit of reference to dBm, dBmV, dBµV, mV, V, µV or nV in the instrument. The exchange formula
between different units is shown as following table.
Table3.1 Exchange formula from other units to dBm
Formula
Source value
New value
dBm = dBµV - 108.8
68.8 dBµV
-40 dBm
dBm = dBmV - 48.8
8.8 dBmV
-40 dBm
dBm = 20*log(mV) – 48.8
2.778 mV
-40 dBm
Table 3.1 only lists the formula to dBm, you can deduce the others.
Three methods to change reference level:
a. Input by number key: After inputting the number, the unit menu will appear. Choose the unit user need to finish
the reference level input.
b. Input by “Up/Down” cursor: The change step of this method is the amplitude that one grid corresponds to.
c. Input by Knob. The change step of this method is the amplitude that 1/10 grid correspond to.
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