SIGLENT
SSA3000X User Manual 25
is adjusted under a constant maximum mixing level in order to fulfill the following condition:
LRef <= aRF-aPA-30dBm。
Table 2- 6 Ref Level
In Log scale mode, step = Scale/10
In Lin scale mode, step=0.1 dBm
In Log scale mode, step = Scale
In Lin scale mode, step=1 dBm
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).
LRef <= aRF-aPA-30dBm。
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 reference level automatic adjustment.
Open the preamplifier, maximum input attenuation can be set to 51db. When setting
parameters do not meet the above formula, can adjust the reference level.
You can modify this parameter using the numeric keys, knob or direction keys. For
more details, please refer to “Parameter Setting.
Table 2- 7 Attenuator
2.1.3.3 RF Preamp
Turn on or off the preamplifier located at the front of the RF signal path. When signal under
measurement is small, turning on the preamplifier can reduce the displayed noise level; there for,
you can distinguish small signals from the noise.
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