User`s manual

MegaPlus
®
Model ES 1.0
3.4.3 Continuous
The camera will take pictures at 30 fps in dual channel mode and 15 fps in single channel mode.
The frame rate is fixed and is not varied by the exposure setting. The camera can be
synchronized to an external trigger source through the TRIGGER input on the rear panel of the
camera or the EXPOSE input of the AIA interface connector. The trigger input frequency must be
between 29.5 and 30.5 Hz. If the camera is not externally triggered, its frame rate will be 29.5
fps. When multiple cameras are driven from the same trigger source, they will be synchronized to
each other within ± 100 nanoseconds. The digital video output is paused for one line time at the
time the exposure starts for the next frame. See continuous mode timing diagram in Chapter 4
for details.
The exposure time range is between 125 microseconds and 33 milliseconds in dual channel
operation. Maximum exposure time increases to 66 milliseconds in single channel mode.
3.4.4 Controlled
The start and exposure time of each image is controlled directly by the user. Control is
accomplished by the EXPOSE input pins in the AIA interface connector or the Trigger input on
the rear panel of the camera. The exposure time is equal to the time the EXPOSE input signal is
true. The frame rate is inversely proportional to the exposure plus readout time. The exposure
time is unlimited, but at room temperatures, dark field non-uniformities become noticeable with
exposure times greater than 100 milliseconds.
3.4.5 Trigger
Each exposure is started by a signal connected to the EXPOSE input pins of the AIA interface
connector or the Trigger input on the rear panel of the camera. The exposure command sets the
exposure time. An exposure starts 20 microseconds (± 100 nanoseconds) after the active edge
of the trigger pulse and ends at the exposure time selected by the EXE command. The active
edge of the trigger pulse is selected using the TRM command.
The EXPOSE input sets the start time for each frame of video. The camera will ignore additional
EXPOSE signals until it completes the current exposure. The trigger mode of operation is used
to capture a single image or a sequence of images.
91000064-004 Revision A 3-3 USER’S MANUAL