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SIGLENT
SSA3000X User Manual 21
2.1.2.6 Last Span
Set the span to the previous span setting.
2.1.2.7 X-Scale
Set the scale type of X-axis to Lin or Log.
In Log scale type, the frequency scale of X-axis is displayed in the logarithmic form.
If the scale type of X-axis is in the logarithmic type form, the scale type will be switched into Lin when
turning on Meas.
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.
2.1.3.1 Ref Level
Set the maximum power or voltage can be currently displayed in the window. The value is displayed at
the upper left corner of the screen grid.
The maximum reference 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
Table 2-6 Ref Level
Parameter
Explanation
Default
0 dBm
Range
-100 dBm ~ 30 dBm
Unit
dBm, dBmV, dBuV, V, W
Knob Step
In Log scale mode, step = Scale/10
In Lin scale mode, step = 0.1 dB
Direction Key Step
In Log scale mode, step = Scale
In Lin scale mode, step = 1 dB
Related to
Attenuator, Preamp, Ref Offset
2.1.3.2 Attenuator
Set the front attenuator of the RF input in order to ensure big signals (or small signals) to pass through
the mixer with low distortion (or low noise).
Ref <= ATT – PA - 20dBm
Input attenuation can be set up for automatic and manual two kinds of patterns.
◆ Automatic mode attenuation value according to the state of preamplifier and value of the current
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