BNC 1420 - Video Microscope - Manual (Page 31)

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Trigger
Time
RAM Buffer
Disk Buffer
Stored video
Stored video
Time
Pre-trigger (top) and post-trigger (bottom) recording
For pre-trigger recording, you save the video sequence occurring before
the trigger, stored in the RAM buffer. With post-trigger recording you
save the video sequence occurring immediately after the trigger and
temporarily stored in the disk buffer. The disk buffer is normally larger
than the RAM buffer.
6.5 Starting and stopping recording
The video recording panel at the bottom of the screen allows you to
control the recording duration and trigger mode.
The video recording panel
To record a post-trigger movie, click record at the bottom left. Click stop
to stop recording. The duration of the movie is selected by the slider bar,
the full duration determined by the disk buffer size.
Clicking the Unlimited radio button allows you to record beyond the disk
buffer duration, but at the risk of dropped frames.
To record a pre-trigger movie, click the Save buffer now button. This will
save the image sequence in the RAM buffer