Sony XC-ST70 User Manual page 21

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-ST70)
293H (XC-ST70CE)
1: This is a signal input from the outside.
*
2: Exposure time Te
*
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 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 s, 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. (The falling edge of an internal VD signal is the same in phase as the
beginning of an equalizing pulse in a SYNC V area.)
6: 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 Te
5
*
T : T = 10 s or more
2
Te = Trigger width + 97 s (XC-ST70), Te = Trigger width + 120 s (XC-ST70CE)
3
*
Normal operation
1/3 s or more
6
*
XC-ST70/70CE
Mode transition state
External input
External trigger
inhibition area
shutter operation
(50 ms)
3
2
*
Exposure
time Te
5
*
T : T = Under 10 s
3
19