Tektronix CSA7404B, User Manual

Page: 96 / 438

Acquiring Waveforms
3- 28
CSA7000B Series & TDS7000B Series Instruments User Manual
H
Single Sequence. In addition to the Run/Stop Button, which can always stop
an acquisition, the SINGLE button (or Single Sequence control) will
automatically stop acquisition when one complete acquisition sequence is
completed. See step 4,
Set the stop mode,
on page 3--30, or access the online
help from the Run/Stop control window for more information.
Untriggered Roll.
Untriggered roll mode displays newly acquired data points at
the right edge of the waveform record while moving older waveform data points
to the left. To stop acquiring data push
RUN/STOP (see Figure 3--6).
Use untriggered roll to continuously observe a slow process, knowing that you
can always see the most recent view of that process. Math and measurements
work after you push STOP.
Untriggered Roll with Single Sequence.
Untriggered roll mode with single
sequence displays newly acquired data points at the right edge of the waveform
record while moving older waveform data points to the left. Acquisitions
automatically stop after a complete waveform record is acquired (see
Figure 3--6). Use untriggered roll with single sequence to observe data for later
viewing.
Acquisitions
continue
Complete waveform record
Acquisitions
stop
Acquisitions
start
New data points
Acquisitions
start
New data points New data points
Old data continues
Old data
Old data
Untriggered roll with single sequence
Untriggered roll
Figure 3- 6: Roll mode
Global Controls. Like the horizontal controls, the acquisition controls apply to all
active channels; for example, channel 1 cannot acquire in Sample mode while
channel 2 acquires in Envelope mode. You cannot stop channel 4 from acquiring
(if turned on) while other channels continue to acquire.