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SIGLENT
22 User Manual
2.1.3 Amplitude
Set the amplitude parameters of the analyzer. Through modifying these parameters, signals under
measurement can be displayed in a proper mode for easier observation and minimum error. Any change
of Ref Level, Attenuator Value, Preamp mode and Ref Offset will restart sweep.
2.1.3.1 Ref Level
Set the maximum power or voltage that can be currently displayed in the trace window. The value is
displayed at the upper left corner of the screen grid.
The maximum reference (Ref) level available is affected by the maximum mixing level; input attenuation
is adjusted under a constant maximum mixing level in order to fulfill the following condition:
Ref <= ATT - PA - 20dBm, where ATT = Attenuation value, PA = Preamplifier value
Table 2-7 Ref Level
Parameter
Explanation
Default
0 dBm
Range
-200 dBm ~ 20 dBm
Unit
dBm, dBmV, dBuV, dBuA, V, W
Knob Step
In Log scale mode, step = Scale/10
In Lin scale mode, step = 0.1 dBm
Direction Key Step
In Log scale mode, step = Scale
In Lin scale mode, step = 1 dBm
Related to
Attenuator, Preamp, Ref Offset
Note: the maximum reference level of different machine models may be different, please refer to the
data manual specifically.
2.1.3.2 Attenuator
Set the value for the internal attenuator of the RF input. So that the large signal can be low distortion
and the small signal can pass through the mixer with low noise.
Ref <= ATT - PA - 20dBm, where ATT = Attenuation value, PA = Preamplifier value
Input attenuation can be set up to auto or manual mode.
● Auto mode: the attenuation value is automatically adjusted according to the state of preamplifier
and the current reference level.
● The maximum input attenuation can be set to 31 dB. When the set parameters do not meet the
above formula, you can adjust the reference level.
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