CV-M77
- 10 -
6.4. Trigger modes
The CV-M77 camera features 4 external triggering modes:
1 Edge Pre-Select. (EPS).
Asynchronous reset and exposure start by an ext. trigger pulse.
2 Pulse Width Control. (PWC).
Exposure control by the low period of the ext. trigger pulse.
3 Readout Delay EPS.
Triggered EPS exposure. Readout controlled by external VD signal.
4 Readout Delayed PWC.
Triggered PWC exposure. Readout controlled by external VD signal.
These external triggering modes operate with H non-reset. In H non-reset, the exposure will be
synchronized to the internal HD, and the exposure will start at the first HD after the negative
going edge of the trigger. Refer to fig. 13. The exposure stops 0.5 H after the last HD pulse.
To avoid the <1H exposure jitter caused by this delay, it is recommended to synchronize the
external trigger to HD as shown in fig. 14.
The trigger input can be TTL level or 75 ohm terminated by setting the specific S301 switch on
the PK 8308 board to OFF or ON (see switch settings). When 75 ohm terminated the signal input
level is 4.0 Vp-p ±2.0V.
Mode setting and all other settings can be done via RS 232C control if rear switch SW1-10 is ON.
Mode setting and some other settings can be done by switch if rear switch SW1-10 is OFF.
For details: refer to “7. Configuring the Camera”.
Important notes on using this mode
Number of effective pixels per line in trigger modes are
1016
(h).
Trigger
Exposure
EDGE PRE-SELECT
shutter time
Read out
int. HD
H non-reset
Fig. 13. H non –reset trigger
Fig. 14. External trigger and HD phase relation
