JAI CV-M50IR - Manual (Page 12)

- 11 -
CV-M50IR
Cautions in the Start/Stop Trigger Mode.
1. The input of ext. VD signal must be given continuously to synchronize with int. VD signal. It is not
possible to input ext. VD signal randomly.
2. The exposure start may delay up to 1H max., when the falling edge of ext. trigger pulse is not
synchronized with the falling edge of ext. HD signal. To avoid this 1H jitter and delay, the falling edge
of the ext. trigger pulse should be synchronized within 4.4 usec. to the HD pulse. It can be the ext. HD
input or the internal HD output.
Shown under cautions in Edge Pre-select Mode page 7.
3. In this mode, the ext. trigger has to be TTL level (2.0 to 5.0 V). It cannot be 75 Ohm terminated. The
duration should be more than 1 H negative going. >64 µsec. and < 1 msec. The input is AC coupled.
4. If the ext. VD input and ext. HD input are from a source with TTL level, set SW2-1 and SW2-2 on
PK8057 board OFF for non-terminated. SW2-1 for ext. HD signal, SW2-2 for ext. VD signal. See “7.2
SW2 on PK8057 Board”.
5. Each scanning mode requires the following number of external trigger pulses:
- 2:1 interlaced: 2 external trigger pulses per frame
- Non-interlaced: 1 external trigger pulse per field
a) Interlaced mode (Frame accumulation mode)
b) 2:1 Interlaced mode (Field accumulation mode)
c) Non-interlace moded (Field accumulation mode)
t1 t1
Ext. VD
Exposure
time
Video
Ext.Trg.
Exposure
time
Video
Ext.Trg.
Ext. VD
time
Video
Ext. VD
Exposure
Ext.Trg.