User guide

LBA-USB User Guide Document No: 11294 Page 47
Trigger Type
The Trigger panel in the Capture dialog box provides control over when an
image is actively captured by LBA-USB.
The selected trigger type governs which of the other Trigger settings become
active:
 CW – Select this trigger type if the laser under analysis operates in a continuous
wave manner, or pulses at a repetition rate that will appear to the camera as
continuous.
 Video Trigger – With this mode selected, the input from the camera is
continuously monitored, and when a laser pulse is detected, the frame is
captured.
The pulse detector has a programmable threshold that is settable in the Video
Trigger Level edit control. The level setting is always in raw digitizer counts.
The suggested second lowest level trigger level value typically will not detect
noise yet remains reasonably sensitive.
Processing
Select options for processing digitized frames of data within the Processing
panel.
This processing determines how each frame that is stored in the frame buffer will
be constructed. This processing occurs prior to calculating any numerical results.
The Processing options are applicable to both newly input frames from the
frame USB camera, and to recorded frames that are being post processed. Select
the source for reference frames from the drop down field immediately below the
Processing panel.