Acquisition and waveform setup
R&S
®
RTP
135User Manual 1337.9952.02 ─ 12
Figure 5-4: Waveforms acquired with different sample rates
To avoid aliasing, the sample rate must be set to a value 3 to 5 times the fastest fre-
quency component of the signal. A higher sample rate increases signal fidelity, increa-
ses the chance to capture glitches and other signal anomalies, and improves the
zoom-in capabilities.
5.1.2.2 Acquisition settings
The sample rate can be the same as the constant ADC sample rate, or higher, or
lower. To get a higher sample rate, interpolation as method of resolution enhance-
ment is used. To reduce the sample rate, decimation methods help: sample, peak
detect, high resolution and RMS.
As digital waveform data is stored in the memory, and the memory can save many
waveform records, further waveform arithmetic processing is possible: average and
envelope waveforms are resulting waveforms, created from a composite of sample
points taken from multiple acquisitions.
You can display up to three waveforms from one input signal and apply different deci-
mation and arithmetic to each waveform.
5.1.2.3 Acquisition control
You can run the R&S RTP in two ways:
●
Run Stop: the instrument acquires data until you stop it manually.
●
Single: the instrument samples and processes a specified number of acquisitions.
Basics
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