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TIMING CHART OF EXTERNAL TRIGGER SHUTTER - MODE 1
For setting the shutter speed using TRG width
HD/VD input
Continuous HD/VD input
External trigger shutter operation
1
1
*
Trigger
2
*
Exposure time
1
*
External HD
1
*
External VD
(Continuous
VD)
4
*
T : T = Under 65 s to under +10 s
EXT-VD
+10 s
–65 s
Video out
1
WEN
250H (XC-ST50/30)
293H (XC-ST50CE/30CE)
TRG
EXT-VD
EXT-VD
1: This is a signal input from the outside. Be sure to input both HD and VD signals in this case.
*
2: Exposure time Te
*
(The trigger width should be between 2 s and 1/4 s)
3: The normal operation state is engaged when the trigger high period exceeds 1/3sec. 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 trigger input inhibition area. During
the trigger inhibit period, an input trigger may be missed.
4: In all cases the WEN signal indicates when a valid image is available. Normally, an image is output after
*
the external falling edge. If the falling edge of the trigger is very close to the falling edge of the external VD,
there may be a delay of 1VD in the output. The period of uncertainty is when the falling edge of VD is
between 65 s before or 10 s after the falling edge of the trigger.
5: When the external trigger shutter mode changes into the 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
4
*
T : T = Under 65 s to under +10 s
2
65 s
10 s
Te = Trigger width + 97 s (XC-ST50/30)
Te = Trigger width + 120 s (XC-ST50CE/30CE)
(NON-RESET MODE)
3
*
Normal operation
1/3 s or more
Te
5
*
XC-ST50/50CE
XC-ST30/30CE
Mode transition state
External input
External trigger
inhibition area
shutter operation
(50 ms)
3
2
*
Exposure
time
Te
10 s or more
3
17