Chapter 2 Functions of the Front Panel of GPSA
RIGOL
RSA3000E User Guide
2-39
Meas Setup
Open the parameter setting menu of the function selected in the Meas menu.
Swept SA
1.
Avg Number
Specifies the number of counts (N) for Average, Max Hold, and Min Hold. For
Average, the greater the value of N, the smoother the trace is displayed.
In Average, Max Hold, and Min Hold modes, when performing the single
measurement, the instrument stops sweeping after the sweep count has
reached N.
Table 2-30 Swept SA Average Count
Parameter
Remarks
Default
100
Range
1 to 10,000
Unit
None
Knob Step
1
Left/Right Arrow Key Step
Up/Down Arrow Key Step
1
2.
Avg Mode
The average modes include "Log", "RMS", and "Scalar".
Log: In this mode, all filtering and averaging processes select the log unit
(dB). This average type is the most effective one for finding the low-level
signal that is close to the noise amplitude. The formula is shown as follow:
k
Newdata
OldAvg
1)
(k
NewAvg
+
×
−
=
(2-15)
In the above formula, the parameter unit is dB.
RMS: In this mode, all filtering and averaging processes work on the power
(the square of the amplitude) of the signal. This average type is best for
measuring the true time average power of complex signals. The formula is
shown as follows:
）
k
10
10
1)
(k
10log
（
NewAvg
10
Newdata
10
OldAvg
+
×
−
=
(2-16)
In the above formula, the parameter unit is dB.
Scalar: In this mode, all filtering and averaging processes work on the
voltage envelope of the signal. This average type is the most appropriate
one for observing the great envelope fluctuations of AM or pulse-modulated
signals such as radar and TDMA transmitters. The formula is shown as
follows:
