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6. Functions and operations
6-1. Input/output of HD/VD signal
a) Input of external HD/VD signal (Factory pre-set)
To input ext. HD/VD signal, make JP9/JP11 short-circuited, and JP12/JP13 open-circuited.
To change the termination of ext. HD/VD signal, it is neccessary to make the jumper JP8/JP10
short-circuited. All jumpers are located on PK8273 board. For details, please refer to 7-2-
3. Jumpers on PK8273 board.
Note : Factory pre-set is set at HD/VD input (TTL) .
b) Output of internal HD/VD signal
To output int. HD/VD signal, make jumper JP9/JP11 open-circuited, and JP12/JP13 short-
circuited. All jumpers are located on PK8273 board. Please refer to 7-2-3. Jumpers on
PK8273 board.
CAUTION
Int. HD/VD signal is effective only at 75 Ohm termination.
6-2. Ext. trigger/readout mode
Ext. trigger mode of CV-M40 allows 3 different driving modes, as follows.
Edge pre-select trigger
mode
Pulse-width control
mode
Frame-delay readout
mode
6-2-1. Edge pre-select mode
In this mode, the exposure starts at the falling edge of the external trigger pulse. The WEN
pulse originates from the camera.
The shutter speed is controlled by the SW1 switch on the rear panel of the camera and the RS
232C serial interface.
For details, refer to the timing charts section of this manual.
To use this mode, set up the camera as follows ;
CV-M40
:
Asynchronous reset by the external trigger pulse
Exposure period controlled by 8-step fixed shutter steps
:
Asynchronous reset by the external trigger pulse
Exposure period controlled by the pulse width of the external trigger pulse.
:
Asynchronous reset by the external trigger pulse
Exposure period controlled by 8 fixed shutter steps
Video readout timing controlled by rising edge of the external trigger
pulse.
8
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