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SIGLENT
118 User Manual
The corresponding icon “PA” will appear at the left side of the screen when the preamplifier is turned on.
7.2.3.4 Units
Set the unit of the Y-axis to dBm, dBmV, dBuV, dBuA, Volts (RMS) or Watts. Default is dBm.
The conversion relationships between units are as follows.
Where, R denotes the reference impedance. The default value is 50Ω and can be adjusted by pressing
“Correction -> RF input”. The “75 Ω” impedance is just a numeric value, not a real impedance. Setting
the RF input to 75 Ω will not change the actual input impedance. A 75 Ω feed-through adapter is required
to match 75 Ω circuits to the 50 Ω input of the analyzer.
7.2.3.5 Scale
Set the logarithmic units per vertical grid division on the display. This function is only available when the
scale type is set to “log”.
● By changing the scale, the displayed amplitude range is adjusted.
● The Minimum range: Reference level –10 × current scale value.
● The Maximum range: The reference level.
Table 7-8 Scale/Div
Parameter
Explanation
Default
10 dB
Range
0.1 dB ~ 20 dB
Unit
dB
Knob Step
Scale>=1, 1 dB,
Scale<1, 0.1dB
Direction Key Step
1-2-5 sequence
Related to
Scale Type
7.2.3.6 Scale Type
Set the scale type of the Y-axis to Lin or Log. The default is Log.
● In Lin mode, the vertical Scale value cannot be changed. The Display area is set for reference level
of 0%.
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