R&S RTO6, Руководство пользователя

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Acquisition and waveform setup
R&S
®
RTO6
122 User Manual 1801.6687.02 ─ 05
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")
●
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 RTO6-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 20
MSample/s. At 50 s, the resulting record length limit is 1000 MSample.
If the acquisition time is
>
50 s, the record length limit is effective, and the maximum
sample rate depends on the acquisition time:
Sample rate
≤
1000 MSample / Acquisition time .
If the acquisition time is <50 s, the maximum sample rate in roll mode depends on the
number of active channels:
Sample rate = 20 MSample/s / Number of active wfms .
The corresponding maximum record length is:
Record length
≤
20 MSample/s * Acquisition time / Number of active wfms .
Thus, the roll mode switches off, or it does not activate automatically if:
●
The record length exceeds the limit at acquisition times
>
50 s.
●
The sample rate exceeds the limit.
●
Too many waveforms are active.
Remote command:
TIMebase:ROLL:ENABle
on page 1331
TIMebase:ROLL:STATe?
on page 1331
Start roll time
The instrument can activate the roll mode automatically if the Acquisition time exceeds
the value given here.
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