JAI CV-A50, CV-A60 operation manual Long Time Exposure Mode, Long time exposure. Field accumulation

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CV-A50 / CV-A60

6.8. Long Time Exposure Mode

The exposure time is the interval between 2 ext. VD pulses sent to the VD input of the camera (Pin No. 7 of the 12-pin Hirose 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 on 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 (525H for EIA and 625H for CCIR).

To use this mode:

 

 

Set function:

Trigger mode to “Long time exposure”

TR=4

 

Accumulation to “Field” or “Frame”

FR=0, F=1

 

Scanning to “Interlaced”

SC=0

 

Shutter to “OFF”

SH=0

 

Polarity and other functions

 

Input:

Ext. VD to pin 7 on 12 pin connector.

 

 

Ext HD to pin 6 on 12 pin connector.

 

Fig. 23. Long time exposure. Field accumulation.

Fig. 24. Long time exposure. Frame accumulation.

Important notes on using this mode:-

•Exposure time range is 1/30 sec. to ∞. However, it is recommended not to use exposure over 2.0 sec. This is because visible dark current noise may appear on the video signal due to the long time exposure of the CCD image sensor.

•Ext. HD signal (TTL 2.0~5.0V) has to be input continuously.

•See Fig. 16 for the phase relationship between ext. HD and ext. VD pulses

•The EEN pulse is not provided when using this mode.

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Contents CV-A50 / CV-A60 Table of Contents CV-A50 / CV-A60General Main FeaturesStandard Composition Camera Housing and Dimensions Pin Multi-connector Trigger and RS232C Pin Multi-connector DC-IN/VIDEO OUT, EXT.HD/VDPin Assignment Input and Output Circuits Video outputTrigger input HD and VD inputFunctions and Operations Basic functionsInput-output of HD/VD Signals Continuous Operation Non triggeredCV-A50 / CV-A60 Vertical timing details for interlaced. Ccir Vertical timing details for interlaced. EIA External Trigger Modes Start/stop Mode. TR=5Edge Pre-select Mode Important notes on using this modePulse Width Control Mode Pulse width control CcirPage Long Time Exposure Mode Long time exposure. Field accumulationStart/Stop Mode Start/stop mode. Interlaced with frame accumulationOther Functions Configuring the Camera RS-232C controlCV-A50/60 RS-232C command list Timing and shutter related commandsCamera Control Tool for CV-A50/60 Selecting termination of HD/VD input signals Internal Switch and Jumper Settings1 HD/VD input-output selection Specifications CV-A50C CV-A50E CV-A60C CV-A60EAppendix Spectral SensitivityCV-A50 or CV-A60 emulating CV-M50 interfacing WEN out on pin 6 on 6 pin connector CV-A50/60 without sync on video outputPrecautions Typical CCD CharacteristicsUsers Record Camera type CV-A50/60
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