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SIGLENT
SSA3000X User Manual 22
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.
Table 2-7 Attenuator
Parameter
Explanation
Default
20 dB
Range
0 ~ 51 dB
Unit
dB
Knob Step
1 dB
Direction Key Step
5 dB
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.
μ
μ
Wherein, R denotes the reference resistance. Default value is 50Ω, setting by “Correction -> RF input”.
The “75 Ω” resistance is just a numeric value, not a real resistance.
2.1.3.5 Scale
Set the logarithmic units per vertical grid division on the display. This function is only available when the
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