Acquisition and Waveform Setup
R&S
®
RTM20xx
24User Manual 1317.4726.02 ─ 01
Decimation Mode..........................................................................................................24
Wavef. Arithmetic..........................................................................................................24
Nx Single.......................................................................................................................25
No. of Averages............................................................................................................25
Limit Freq......................................................................................................................25
Waveform Rate.............................................................................................................25
Record Length...............................................................................................................26
Roll................................................................................................................................26
Sample Mode................................................................................................................26
Interpolation..................................................................................................................27
Decimation Mode
Decimation reduces the data stream of the ADC to a stream of waveform points with
lower sample rate and a less precise resolution if the oscilloscope captures more samples
than the waveform memory can save.
"Sample"
The oscilloscope acquires the input data with a sample rate which is
aligned to the time base (horizontal scale) and the memory depth. Usu-
ally, most signals are displayed optimally with this acquisition mode if
all trigger conditions are met.
"Peak Detect"
The minimum and the maximum of n samples are recorded as wave-
form points, the other samples are discarded. Thus the instrument can
detect fast signal peaks at slow time scale settings that would be missed
with other acquisition modes.
"High Resolu-
tion"
The average of n captured sample points is recorded as one waveform
sample. Averaging reduces the noise, the result is a more precise
waveform with higher vertical resolution.
Remote command:
CHANnel<m>:TYPE on page 286
Wavef. Arithmetic
Waveform arithmetic builds the resulting waveform from several consecutive acquisitions
of the signal (envelope and average) or by other operations on the captured data. The
arithmetic works with all sample modes and decimated waveforms.
"Off"
No arithmetic is applied.
"Envelope"
The minimum and maximum values are saved in addition to the normal
waveform samples. The resulting diagram shows two envelope wave-
forms below and above the normal waveform: the minimums (floor) and
maximums (roof) representing the borders in which the signal occurs.
The envelope is refreshed with each acquisition and it is reset each time
the waveform parameters are changed.
Reference for Waveform Setup
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