JAI CV-A11 operation manual Long Time Exposure Mode, Long time exposure

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CV-A11

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).

To use this mode:

 

 

Set function:

Trigger mode to “Long Time exposure”

TR=4

 

Polarity and other functions

 

Input:

Ext. trigger to pin 5 on 6 pin connector (or 11 on 12 pin connector)

 

Ext. VD to pin 7 on 12 pin connector.

 

 

Ext. HD to pin 6 on 12 pin connector.

 

Fig. 20. Long time exposure.

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.

External sync system should follow the camera scanning system.

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

See Fig. 11 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-A11 CV-A11 Table of ContentsGeneral Main FeaturesStandard Composition Camera Housing and Dimensions Pin Multi-connector Trigger and RS232C Pin Multi-connector DC-IN/VIDEO OUT, EXT.HD/VDPin Assignment Video output Input and Output CircuitsTrigger input HD and VD inputBasic functions Functions and OperationsContinuous Operation Non triggered Input-output of HD/VD SignalsEdge Pre-select Mode.TR=1 External Trigger ModesImportant notes on using this mode Edge Pre-select ModePulse width control Pulse Width Control ModeFrame delay read out Frame-delay read out ModeLong time exposure Long Time Exposure ModeStart/stop mode Start/Stop ModeSmearless mode Smearless ModeReadout format Frame rate Effective lines Partial scan readout modeOther Functions RS-232C control Configuring the CameraUseful commands CV-A11 RS-232C command listCamera Control Tool for CV-A11 Selecting termination of HD/VD input signals Internal Switch and Jumper Settings1. HD/VD input-output selection Spectral Sensitivity SpecificationsAppendix WEN out on pin 6 on 6 pin connectorCV-A11 emulating CV-M10 interfacing Typical CCD Characteristics PrecautionsCamera type CV-A11 Revision Revision a Serial No …………… Users Record