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Waveform Setup
R&S
®
RTB2000
49User Manual 1333.1611.02 ─ 03
Horizontal Position
Defines the trigger position, the time distance from the trigger point to the reference
point (trigger offset). The trigger point is the zero point of the diagram. Changing the
horizontal position, you can move the trigger, even outside the screen.
If you want to see a section of the waveform some time before or after the trigger,
enter this time as horizontal position. The requested waveform section is shown
around the reference point. Use positive values to see waveform sections after the trig-
ger - the waveform and the diagram origin move to the left.
The value is indicated in the information bar above the grid.
Remote command:
TIMebase:POSition on page 259
4.4 Acquisition Setup
During an acquisition, the R&S RTB2000 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 5.1, "Trigger Controls", on page 53.
●
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.
4.4.1 Shortcuts for Acquisition Settings
To adjust the acquisition mode, and to perform a single acquisition, you can use the
shortcuts on the top of the display. The labels show the current values.
Acquisition Setup
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