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Waveform setup
R&S
®
RTA4000
72
User Manual 1335.7898.02 ─ 08
Offset
Same as "Offset" in the "Vertical" menu, see
Copy to offset
Same as "Copy to offset" for active broadband single-ended probes, see
on page 64. The offset value is also shown in the "Channel
<n>" menu.
ProbeMeter
®
Same as "ProbeMeter
®
" for active broadband single-ended probes, see
Info
Same as for active single-ended probes, see
AC coupling for power rail probes
For the required 50
Ω
input termination, the usual AC coupling is not available. There-
fore, you can enable AC coupling directly in the R&S
RT-ZPR probe, which removes
DC and very low-frequency components.
To enable AC coupling, use the channel menu or the short channel menu.
Remote command:
5.5
Acquisition setup
During an acquisition, the R&S
RTA4000 captures the signal and converts it to digital
samples. The digital samples are processed according to the acquisition settings. The
result is a waveform record that is displayed on the screen and stored in memory.
The number of waveform samples in one waveform record is called the record length.
The rate of recording waveform samples - the number of waveform samples per sec-
ond - is the sample rate. The higher the sample rate, the better is the resolution and
the more details of the waveform are visible.
A sufficient resolution is essential for correct reconstruction of the waveform. If the sig-
nal is undersampled, aliasing occurs - a false waveform is displayed. To avoid aliasing
and accurately reconstruct a signal, the sample rate must be at least 3 to 5 times the
fastest frequency component of the signal.
There are several ways to adjust and control acquisition:
●
Use the controls in the Trigger functional block of the front panel to start and stop
acquisition. See
Chapter 6.1, "Trigger controls"
●
Use shortcuts to adjust the acquisition mode, and to perform a single acquisition.
●
Use the comprehensive menu to adjust all acquisition settings.
► To start or stop acquisition, use the [Run Stop] and [ Single] keys in the Trigger
section at the front panel.
Acquisition setup