19

XC-ST50/50CE

XC-ST30/30CE

1/3 s or more

µs or more

Video out

WEN

External trigger shutter operation

Mode transition state

External input

inhibition area

(50 ms)

External trigger

shutter operation

µs

1

2

3

1

2

3

250H (XC-ST50/ST30)

293H (XC-ST50CE/ST30CE)

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)

*

1: This is a signal input from the outside.

*

2: Exposure time Te

Te = Trigger width + 97

µs (XC-ST50/ST30)

Te = Trigger width + 120

µs (XC-ST50CE/ST30CE)

*

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

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. (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.