Redlake MASD 1.4i, User Manual

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Mega Plus
®
Model 1.4i
4.9 Timing Waveforms
4.9.1 Exposure Timing
The start and stop of exposure time are synchronized with the falling edge of LINE DATA VALID.
The exposure time interval, whether generated internally or externally, is sampled at the falling
edge of LINE DATA VALID. Any start or stop exposure command occurring less than 250
nanoseconds before the falling edge of LINE DATA VALID may go undetected. This means that
the camera will not respond to the start or stop command until another line has been processed.
All exposure events are quantized in steps of one line time or 139.4 µsec. This normally has no
effect on exposure because one or two line times (0.1 to .2 ms) is a small percentage of the total
10 to 500 millisecond exposure time.
NOTE : Any asynchronous input pulse must be wide enough to be seen by at least one horizontal
SYNC, which occurs once every 139.4 microseconds. A pulse width of less than 139.4
microseconds may be missed.
Figure 4-9. Exposure Timing Waveform
91000050-002 Revision A 4-11 USER’S MANUAL