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6.3. External Trigger Mode
External trigger mode of CV-M10 allows 2 different driving modes:
1 Edge Pre-select mode. (Asynchronous reset and exposure start by an ext. trigger)
2 Pulse Width Control mode. (Exposure control by the low period of the ext. trigger)
For both there are two trigger modes. H reset and H non-reset. H non-reset mode allows input of synchronized external
trigger and external HD.
The trigger input is AC coupled, so there is a maximum pulse width for the trigger pulse about 1 msec. The signal level must
be 4.0V p-p +/- 2.0V on the input, which is non-terminated. The trigger input can be changed to 75 ohm by shorting JP10. See
instructions in "8. Jumper Settings".
6.3.1. Edge Pre-select Trigger Mode
This trigger mode can operate in H reset mode or H non-reset mode.
In H reset mode the falling edge of the trigger will immediately reset the internal HD and start the exposure. The trigger input
should be >2 µsec. to <1 msec. If the camera is synchronized to an external HD, there are some requirements to the phase
between the ext. HD and the Ext. trigger. The falling edge of the trigger should be within 4.4 msec. from the falling edge of
the ext. HD. Otherwise the jitter will be too high. (See fig. 6.3)
In H non-reset mode the exposure will start at the first internal HD after the trigger. The trigger input should be >64 µsec. to
<1msec. An external trigger pulse initiates the capture, and the exposure time (accumulation time) is governed by the fixed
shutter speed set up by the rear panel DIP-switches, (internal switch for BX version.) or via RS-232C. The resulting video
signal will start to be read out after the selected shutter time. The WEN pulse indicates the start of valid video signal. Refer
to timing charts for details. A new trigger pulse must not be applied before the video read out has been finished.
To use this mode
Set: SW1-4 on BX rear to OFF for random trigger. For RS select trigger mode.
JP12 on PK8206 (BX ver.) or PK8190 (RS ver.) OPEN for Edge Pre-select
JP13 on PK8206 (BX ver.) or PK8190 (RS ver.) OPEN for H Reset
JP13 on PK8206 (BX ver.) or PK8190 (RS ver.) Short for H Non Reset
SW1-1 through SW1-3 on rear and SW1 on (BX) PK8206 for exposure time
Note: For CV-M10RS the selection of Edge Pre-select, Pulse Width Control H Reset and H non-reset cannot be done by
RS232C.
(See chapter 7 and 8 for details)
6.3.2. Pulse Width Control Trigger Mode
This trigger mode can operate in H reset mode or H non-reset mode.
In H reset mode the exposure will start immediately at the falling edge of the trigger. (The internal H will not be reset). The
exposure will end and the internal H will be reset at the rising edge of the trigger.
In H-non-reset mode the trigger and HD is synchronized. The exposure will start at the first HD pulse after the falling edge
of the trigger. The exposure stops at the trigger rising edge. The trigger pulse can be anything between >1H and <625H. To
avoid jitter, the camera should be synchronized to an external HD. There are some requirements to the phase between the
ext. HD and the Ext. trigger. The falling and rising edge of the trigger should be within 4.4 µsec. from the falling edge of the
ext. HD. (See fig. 6.3)