SIGLENT
SSA3000X User Manual 31
2.2.1.3 V/R Ratio
Set the ratio of VBW to RBW. This value is different while measuring different kinds of signals:
Sine signal: use 1 to 3 (for faster sweeps)
Pulse signal: use 10 (to reduce the influence on the amplitude of transient signals)
Noise signal: generally use 0.1 (to obtain the average of noises)
Table 2- 12 V/R Ratio
2.2.1.4 Average Type
Chooses one of the following averaging type: log power (video), power (RMS), or voltage
averaging. When trace average is on, the average type is shown on the left side of the display.
1. Log Power
Selects the logarithmic (decibel) scale for all filtering and averaging processes. This scale is
"Video" because it is the most common display and analysis scale for the video signal within a
spectrum analyzer. This scale is excellent for finding CW signals near noise.
2. Power Average
In this average type, all filtering and averaging processes work on the power(the square of the
magnitude) of the signal, instead of its log or envelope voltage. This scale is best for measuring
the true time power of complex signals.
3. Voltage Average
In this Average type, all filtering and averaging processes work on the voltage of the envelope of
the signal. This scale is good for observing rise and fall behavior of AM or pulse-modulated signals
such as radar and TDMA transmitters.
2.2.2 Trace
The sweep signal is displayed as a trace on the screen.
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