Sony XC-ST50 Technical Manual - Page 16

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Sony XC-ST50 Technical Manual
Setting the shutter speed using trigger pulse width
No HD/VD input (Internal synchronization)
External trigger shutter operation
1
Trigger*
1
Exposure
time (Te)*
Internal VD*
4
Video out
1
WEN
250 H (EIA)
293 H (CCIR)
*1 This is an external input signal.
*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. The trigger falling
edge restores external trigger shutter operation. At
this time, the 50 msec 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.
*4 The internal VD signals are output as long as there is
no external input and the HD/VD signal input/output
switch on the rear panel is set to INT.
XC-ST51/ST51CE
XC-ST50/ST50CE
XC-ST30/ST30CE
2
Exposure
2
time (Te)*
2
T: T=10 µ sec or more*
2
Normal operation*
3
Trigger pulse width
3
*
5
6
*
*5 In external trigger operation, the image is output
for the internal VD falling edge after the trigger
falling edge (1 and 2 in the figure). If the period
from the trigger falling edge to the internal VD
falling edge (T in the figure) is under 10 µ sec, it is
not defined whether the image is output for the
internal VD falling edge or the image is output for
the next internal VD falling edge. (3 in the figure
shows that the image is output for the next internal
VD). In this case, see WEN since the image and
WEN make up a pair. (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 not output correctly when the next trigger
is input before the image for the previous trigger has
been output.
Mode Settings
Mode transition state
External input
inhibition area
External trigger
(50 msec)
shutter operation
3
Exposure time
(Te)*
2
T: T=under 10 µ sec*
3
5
16