20
XC-ST70/70CE
TIMING CHART OF EXTERNAL TRIGGER SHUTTER - MODE 1 (NON-RESET MODE)
For setting the shutter speed using DIP switch
HD/VD input
•
Continuous HD/VD input
*
1: This is a signal input from the outside. The period of a continuous VD signal is prescribed as one field. Be
sure to input both HD and VD signals.
*
2: As shown in the table on page 7, exposure time Te is determined by the setting of a DIP switch.
*
3: The normal operation state 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 image is output when an external VD signal falls 10 ms or more after a trigger pulse rises (shown by
2
and
3
in the figure). If the time (T in the figure) between the falling edges of a trigger pulse and external
VD signal is under 10 ms, an image is output when the external VD signal or the next external VD signal
falls (as shown by
1
in the figure). (In this case, an image is output when the next external VD signal falls.)
An image and WEN signal are always output together. For more details, refer to the WEN signal.
Note
: An image is superimposed when the next exposure ends before the previous image is output.
1/3 s
*
1
Trigger
*
1
External HD
Video out
WEN
*
1
External VD
(Continuous
VD)
External trigger shutter operation
*
3 Normal operation
Mode transition state
External input
inhibition area
(50 ms)
External trigger
shutter operation
*
4 T : T = Under 10 ms
*
4 T : T = 10 ms or more
*
4 T : T = 10 ms or
more
*
2 Exposure time
Te
*
2 Exposure time
Te
*
2 Exposure
time
Te
250H (XC-ST70)
293H (XC-ST70CE)
250H (XC-ST70)
293H (XC-ST70CE)
1
2
3
1
2
3
