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SIGLENT
SSA3000X User Manual 25
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 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
Parameter
Explanation
Default
Explanation
Range
10dB
Unit
0 ~ 51 dB
Knob Step
dB
Direction Key Step
1dB
Related to
Preamp, Ref level
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.
The corresponding icon ―PA‖ will appear at the left side of the screen when the preamplifier is
turned on.
2.1.3.4 Units
Set the unit of the Y-axis to dBm, dBmV, dBuV, Volts(RMS) and Watts. The default is dBm。
The conversion relationships between units are as follows.
dBm = 10lg
Volts
2
R
×
1
1mW
dBμV = 20lg
Volts
1μV
dBmV = 20lg
Volts
1mV
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