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Prerequisites
1
Power on the instrument and set up the horizontal and vertical
controls and triggering.
Enable roll mode
2
Click the Horiz toolbar button to open the
Horizontal/Acquisition Setup control window. Select the
Acquisition tab.
3 Click Roll Mode Auto to enable roll mode. The resolution,
record length, horizontal scale, and number of active channels
on are dependent variables. Therefore, the fastest horizontal
scale setting when Roll mode starts is 40 ms/div, the record
length is 500 (resolution is 2 ms), the acquisition mode is either
Sample or Peak Detect, and 1 or 2 channels must be on. As the
record length or the number of on channels grows, the time per
division required to enter Roll mode is slower.
Note
Envelope and Average acquisition modes inhibit roll mode. Hi
Res roll mode starts when the resolution is 4 ms or greater.
Enable single sequence
roll mode
4
Push the SINGLE button to start and acquire enough points to
satisfy the acquisition mode (when the waveform makes it to
the left edge of the screen). The acquisition mode must be either
Sample or Peak Detect.
Turn off roll mode
acquisitions
5
To stop acquisitions in roll mode:
 If you are not in Single Sequence, push RUN/STOP to
stop roll mode.
 If you are in Single Sequence, roll mode acquisitions
stop automatically when a complete record is acquired.
Disable roll mode
6
Click the Horiz toolbar button to open the
Horizontal/Acquisition Setup control window. Select the
Acquisition tab.
7 Click Roll Mode Off to disable roll mode. Roll mode is also
disabled when you set the horizontal scale to 200 ms per
division or faster. At record lengths greater than 500 points, the
time per division to turn off roll mode becomes slower.
Note
Switching to Envelope or Average acquisition mode will
also turn off roll mode.
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