Sony XC-ST51 Technical Manual page 15

Setting the shutter speed using trigger pulse width
HD/VD input
• Continuous HD input/Single VD input
External trigger shutter operation
1
1
Trigger*
Exposure time (Te)*
External HD* 1
1
External VD*
(Single VD)
T: T=10 µ sec to 100 msec*
Video out
WEN
*1 This is an external input signal. Make sure to input
both HD and VD signals in this case. Input the
signal so that the VD phase aligns with the HD
falling edge.
*2 Exposure time (Te)
Te = Trigger pulse width + 97 µ sec (EIA)
Te = Trigger pulse width + 120 µ sec (CCIR)
(The effective trigger pulse width for the external
trigger shutter operation is between 2 µ sec and 1/4
sec.)
*3 Normal operation is resumed when the trigger
pulse width is 1/3 sec or more. (During this period,
if you input VD signals continuously, an image
will be output.) The trigger falling edge restores
external trigger shutter operation. At this time, the
50 ms after the falling edge of the trigger pulse is
an external trigger input inhibition area. There is
no guarantee of operation for any trigger input in
this period.
XC-ST51/ST51CE
XC-ST50/ST50CE
XC-ST30/ST30CE
Trigger pulse width
2
4
1
250 H (EIA) 250 H (EIA)
293 H (CCIR) 293 H (CCIR)
*4 Input the external VD within the period of 10 µ sec
*5 When the external trigger shutter mode changes
Note
Make sure that the trigger signal and the VD signal
make up a pair.
An image is not output correctly when the next trigger
is input before the image for the previous trigger has
been output.
Mode transition state
3
Normal operation*
3
*
5
*
to 100 msec after the trigger falling edge (1 and
2 in the figure). There is no guarantee of
operation for any other input. If an invalid signal is
input, the input is changed to a valid signal and,
after several V signals, normal operation resumes.
into the normal operation mode, one WEN signal
is output.
Mode Settings
External input
External trigger
inhibition area
shutter operation
(50 msec)
2
Exposure time
(Te)* 2
µ
Min. 10 sec
2
250 H (EIA)
293 H (CCIR)
15