JAI CV-M50IR - Manual (Page 11)

- 10 -
CV-M50IR
6.3.3. Start/Stop Trigger Mode
The Start /Stop trigger will work in 3 modes:
1. Interlaced with frame accumulation.
2. Interlaced with field accumulation.
3. Non-interlaced with field accumulation.
The exposure time is controlled by the interval between the ext. trigger pulse and the ext. VD signal. The
exposure starts at the first HD pulse after the falling edge of the ext. trigger, and stops at the rising edge
of the VD pulse. The range can be within 1/77 to 1/10,000 sec.
The Start/Stop mode is a continuous mode where the VD signal must be given continuously. It is not
possible to input ext. VD randomly.
For the interlaced modes 2 ext. trigger pulses should be applied for each frame. It is one for each field.
In this way it is possible to have different exposure time for the 2 fields within an interlaced frame.
The difference between interlaced frame accumulation or field accumulation can be explained as follow.
Both modes have 2 fields output in an interlaced frame. With frame accumulation the contents in the
ODD and EVEN sync. fields will come from sensing field 1 and 2 on the CCD sensor. With field
accumulation both ODD and EVEN sync. field will contain the signal from sensing field 1 and 2 added
together.
Non-interlaced with field accumulation needs only 1 trigger pulse for each field.
To use this mode
Set:
SW1-1,2 and 3 to ON for 1/10,000 sec.
SW1-4 to OFF for normal shutter.
SW1-5 to ON for frame accumulation or OFF for field accumulation.
SW1-6 to OFF for 2:1 interlaced or ON for non-interlaced.
Jumper JP R127 on the PK8054 board OPEN
Jumper JP8, JP9, JP10 on PK8057 to SHORT
Jumper JP7 on PK8057 to OPEN
Input: Ext. trigger to pin 5 on 6 pin multi connector. (Can not be 75 Ohm terminated.)
Ext. VD to pin 7 on 12 pin multi connector.
Ext. HD to pin 6 on 12 pin multi connector. (If used).
HD/VD 75 Ohm termination is done with SW2-1 and SW2-2 on PK8057 board.
Refer to Timing Chart and Cautions on next page.
Detailed switch and jumper setting is described in “7. Mode Setting”.
For connections see “5. Pin Assignment”.