LYNX Manual RA02
TO CAMERA
+ TRIGGER IN
- TRIGGER IN
R1
300
25 mA MAX
C A M E R A
Figure 2.37 - Hardware Trigger Electrical Connection
2.5.1
Standard Triggering - Programmable Exposure
When the standard triggering mode is enabled, the camera idles and waits
for a trigger signal. Upon receiving the external trigger signal, the camera
clears the horizontal and vertical registers, sends one 5 microseconds shutter
pulse to clear the pixels and starts integration. The exposure time for the
first frame can be programmed from 10 usec to 655 msec (in 10
microseconds increments) using the ‘spe’ (Set Pre Exposure) command.
There is a fixed additional delay of 5 usec (because of the shutter pulse)
between the rising edge of the trigger pulse and the beginning of the
integration – Figure 2.38. If the CC1 input is used - the duration of the CC1
trigger pulse can also be used to determine the first frame exposure time.
After the first frame has been exposed, the camera is free running, where the
frame rate determines the exposure time. The number of frames captured
after the trigger pulse goes high can be programmed from 1 to 250 frames,
or to be free-running – refer to the ‘std’ command. Along with the shutter
pulse, the camera sends one strobe pulse (200 microseconds duration) for
synchronization with an external strobe. This pulse is always present in the
external trigger mode.
CAUTION NOTE
1.
Enabling several trigger options at the same time will result in
an error – refer to Status LED section.
2.
For proper operation - if series of trigger pulses are used, make
sure that the timing interval between them is greater than the
corresponding frame duration – refer to section 2.1.4 Timing
Diagrams.
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