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TIMING CHART OF EXTERNAL TRIGGER SHUTTER - MODE 1 (NON-RESET MODE)
For setting the shutter speed using TRG width
No HD/VD input (Internal synchronization)
External trigger shutter operation
1
1
*
Trigger
2
*
Exposure time
4
*
Interrnal VD
Video out
1
WEN
250H (XC-ST50/ST30)
293H (XC-ST50CE/ST30CE)
1: This is a signal input from external equipment.
*
2: Exposure time Te
*
3: Normal operation is engaged when the high period exceeds 1/3 sec. After that, the external trigger shutter
*
operation is engaged when the trigger pulse goes "low". In this case, the area between the falling edge of
a trigger pulse and the subsequent 50 ms period is an external input inhibition area. During the trigger
inhibit period, an input trigger may be missed.
4: An internal VD signal is output by setting the INT/EXT switch on the rear panel to INT.
*
5: During external trigger shutter operation, an image is output when an internal VD signal falls after a trigger
*
pulse falls (as shown by 1 and 2 in the figure). However, if the time (T in the figure) between the falling
edges of a trigger pulse and internal VD signal is under 10 µs, an image is output when the internal VD
signal or the next internal VD signal falls (as shown by 3 in the figure). (In this case, an image is output
when the next internal VD signal falls.) An image and WEN signal are always output together. For more
details, refer to the WEN signal.
6: When the external trigger shutter mode changes to normal operation mode, one WEN signal is output.
*
Note
: An image is superimposed when the next exposure ends before the previous image is output.
2
2
*
Te
Exposure time
Te
5
T : T = 10 µs or more
*
2
Te = Trigger width + 97 µs (XC-ST50/ST30)
Te = Trigger width + 120 µs (XC-ST50CE/ST30CE)
3
*
Normal operation
1/3 s or more
6
*
XC-ST50/50CE
XC-ST30/30CE
Mode transition
External input
External trigger
inhibition area
shutter operation
(50 ms)
3
2
*
Exposure
time
Te
5
T : T = Under 10 µs
*
3
19