JAI CV-M91 operation manual Long time integration, Long time interlaced field integration

CV-M91

6.2.5. Long time integration

The exposure time is the interval between 2 ext. VD pulses sent to the VD input. (Pin No. 7 of the 12-pin connector). The exposure starts after input of the first ext. VD pulse, and ends after the next input of the next ext. VD pulse, which again starts a new exposure. The long time exposure is a continuous process where each external VD will synchronize the camera, stop the exposure, start a new exposure and read out the previous accumulated signal. The exposure time can be selected in intervals of complete vertical timing periods. (Interlaced frame: EIA 525H and CCIR 625H. Non-interlaced field EIA 262H and CCIR 312H).

Refer to “7. Configuring the Camera.”

To use this mode:
Set function:	Trigger mode to “Long Time integrationl”. SW 1-4 to OFF
	On PK8407: JP301 open, JP302 short, JP311 short.
	Accumulation to “Field” or “Frame”. SW 301-4 to OFF or ON
	Scanning to “Non-interlaced” or “Interlaced”. SW 1-5 to ON or OFF
	Shutter Speed to “OFF ”. SW 1-1 through 1-3 to OFF
	Other functions
Input:	Ext. VD to pin 7 on 12-pin connector
	(Ext. HD to pin 7 on 12-pin connector). Option

Important notes on using this mode.

•The exposure range is from 1 field to ∞. However it is recommended not to use exposure over 2 seconds due visible dark current signals.

•The ext. VD signal should follow the camera sync system and interlace setting.

•Requirements to HD/VD phase is shown in fig. 10.

Fig. 27. Long time interlaced field integration

Fig. 28. Long time interlaced frame integration

Fig. 29. Long time non-interlaced field integration

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