Sony XC-ST50CE Manuel technique - Page 19
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TIMING CHART OF EXTERNAL TRIGGER SHUTTER - MODE 1
For setting the shutter speed using TRG width
HD/VD input
• Continuous HD/VD input
External trigger shutter operation
1
1
*
Trigger
2
*
Exposure time
1
*
External HD
1
*
External VD
(Continuous
VD)
4
T : T = Under 65 µs to under +10 µs
*
EXT-VD
+10 µs
–65 µs
Video out
1
WEN
250H (XC-ST50/30)
293H (XC-ST50CE/30CE)
TRG
EXT-VD
EXT-VD
1: This is a signal input from external equipment. Be sure to input both HD and VD signals in this case.
*
2: Exposure time Te
*
(The trigger width should be between 2 µs and 1/4 s)
3: Normal operation is engaged when the trigger high period exceeds 1/3sec. 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 trigger input inhibition area. During the
trigger inhibit period, an input trigger may be missed.
4: In all cases the WEN signal indicates when a valid image is available. Normally, an image is output after
*
the external falling edge. If the falling edge of the trigger is very close to the falling edge of the external VD,
there may be a delay of 1VD in the output. The period of uncertainty is when the falling edge of VD is
between 65 µs before or 10 µs after the falling edge of the trigger.
5: When the external trigger shutter mode changes to 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
4
T : T = Under 65 µs to under +10 µs
*
2
65 µs
10 µs
Te = Trigger width + 97 µs (XC-ST50/30)
Te = Trigger width + 120 µs (XC-ST50CE/30CE)
(NON-RESET MODE)
3
*
Normal operation
1/3 s or more
Te
5
*
XC-ST50/50CE
XC-ST30/30CE
Mode transition
External input
External trigger
inhibition area
shutter operation
(50 ms)
3
2
*
Exposure
time
Te
10 µs or more
3
17