Acquisition and waveform setup
R&S
®
RTP
143User Manual 1337.9952.02 ─ 12
5.2.2 Zoom settings
The zoom settings are described in Chapter 7.1, "Zoom", on page 272.
5.2.3 Roll settings
Access: "Menu" > "Horizontal" > "Roll" tab.
In this dialog, you can define the roll mode.
Roll mode
Selects, if the roll mode is set automatically by the instrument or if it is turned off.
In roll mode, the instrument shows the waveforms immediately, without waiting for the
complete acquisition of the waveform record. If the time base is slow - at long time
scale values - the roll mode saves waiting for the waveform display. The instrument
displays newly acquired waveform points at the right edge of the display and moves
the waveform to the left.
The roll mode has following restrictions:
●
Roll mode disables persistence
●
History is not available
●
Event actions are not possible
The instrument activates the roll mode automatically if the following conditions are ful-
filled:
●
Acquisition time exceeds the defined "Minimum acquisition time"
●
Waveform arithmetic is disabled ("Off")
●
Only one waveform per channel is active
●
All channel waveforms are set to the same decimation mode, and only to one of
these values: "Sample", "Peak detect", or "High res"
●
All mask tests are disabled
●
Fast segmentation is disabled
●
Event actions are disabled
●
FFT is disabled
●
All serial buses are disabled
●
All digital channels are disabled (MSO option R&S RTP-B1)
●
No CDR jitter data is acquired
●
No zone trigger is active
The roll mode depends also on sample rate and record length. In roll mode, the sample
rate limit is 2 MSa/s. At 50 s, the resulting record length limit is 100 MSa.
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