Acquisition and waveform setup
R&S
®
RTE
182User Manual 1326.1032.02 ─ 20
There are different methods to define the recorded waveform point out of n sample
points:
"Sample"
One of n samples in a sample interval of the ADC is recorded as
waveform point, the other samples are discarded. The time between
the two adjacent waveform points is exactly the resolution. Very short
glitches might remain undiscovered by this method.
"Peak detect"
The minimum and the maximum of n samples in a sample interval are
recorded as waveform points, the other samples are discarded.
"High res"
The average of n sample points is recorded as one waveform sam-
ple. Averaging reduces the noise, the result is a more precise wave-
form with higher vertical resolution.
"RMS"
The waveform point is the root mean square of n sample values.
Thus, the RMS value reflects the instantaneous power. This arith-
metic mode is used to average a measured power waveform. Linear
averaging of power signals causes an error dependent on the noise
of the signal to be averaged.
Remote command:
CHANnel<m>[:WAVeform<n>]:TYPE on page 1114
Arithmetic
Waveform arithmetic builds the resulting waveform from several consecutive acquisi-
tions of the signal. The arithmetic works with interpolated and decimated waveforms.
The methods are:
"Off"
The data of only one acquisition is recorded according to the decima-
tion settings. In effect, no waveform arithmetic is processed.
"Envelope"
Detects the minimum and maximum values in a sample interval over
several acquisitions. Each acquisition is done in the "Peak detect"
decimation mode, and the most extreme values for all acquisitions
build the envelope. The resulting diagram shows two envelope wave-
forms: the minimums (floor) and maximums (roof).
Note: If you change from "Envelope" to "Off", make sure to set also
the "Decimation" to the required value.
"Average"
The average is calculated from the data of the current acquisition and
several acquisitions before. The method reduces random noise and
other heterodyne signals. It requires a stable, triggered and periodic
signal for correct function.
The number of acquisitions for average calculation is defined with
"Average count"
Remote command:
CHANnel<m>[:WAVeform<n>]:ARIThmetics on page 1114
Average count (N-single count)
Access:
●
TRIGGER > "Control" tab > "Average count (N-single count)"
●
[ACQUISITION] > "Average count (N-single count)"
Horizontal settings
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