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26 SSA3000X User Manual
The corresponding icon “PA” will be 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 and Watts. The default is dBm。
The conversion relationships between units are as follows.
dBm = 10log
Volts
2
R
×
1
0.001W
dBV = 20log
Volts ×10
6
1uV
dBmV = 20log
Volts ×10
3
1mV
Watts =
Volts
2
R
Wherein, R denotes the reference resistance. Value is 50Ω
2.1.3.5 Scale
Set the logarithmic units per vertical grid division on the display. This function is only available
when the scale type is set to “log”. In use process pay attention to the following points:
By changing the scale, the amplitude range available is adjusted。
The range of the amplitude that can be displayed
Minimum: reference level –10 × the current scale value;
Maximum: 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- 8 Scale
Scale≥1，Step=1 dB
Scale<1，Step=0.1 dB
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