Acquisition and waveform setup
R&S
®
RTO6
122User 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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