Chapter 4 Functions of the Front Panel of EMI
RIGOL
RSA3000E User Guide
4-19
Measurement Settings
Meas
Provides the frequency scan measurement function.
Meas Setup
Avg Setting
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, the instrument will not stop
sweeping until the sweep count has reached N only when the scan sequence is
"Scan Only" and the instrument performs the single sweep. Except "Scan Only",
when other scan sequences are started, if the selected trace type is "Average",
"Max Hold", or "Min Hold", the measurement will stop after a specified number
of times of measurement is executed.
Table 4-15 Average Count
Parameter
Remarks
Default
1
Range
1 to 10,000
Unit
None
Knob Step
1
Left/Right Arrow Key Step
1
Up/Down Arrow Key Step
1
2.
Avg Type
Selects the average type to "Log", "RMS", or "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
+
×
−
=
(4-8)
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. As the voltage
result is in proportion to the square root of the average of the square of the
voltage, it is also called the root mean square. The formula is shown as
follows:
