JAI CV-M532 operation manual Long Time Exposure Mode, Eia

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CV-M532

6.3.4. Long Time Exposure Mode

The Long time exposure will work in 3 modes:

1.Interlaced with field accumulation.

2.Interlaced with frame accumulation.

3.Non-interlaced with field accumulation.

The exposure time is the interval between 2 ext. VD pulses sent to the camera VD input. Each ext. VD pulse will reset and restart the internal VD in the camera as for ext. HD/VD input. So the camera is synchronized to the external HD/VD supply after each VD input.

An exposure starts after input of an external VD pulse, and ends after the next input of ext. VD, which again starts a new exposure.

The long time exposure is a continuous process where each external VD will synchronize the camera, stop an exposure, start a new exposure and read out the previous accumulated signal as interlaced or non-interlaced fields.

The exposure control can be done by feeding every Nth VD pulse from the external HD/VD supply to the camera. N is the wanted exposure time in number of fields. This is typically done in the frame grabber PC.

The range for long time exposure is from 1 V (a single field) to . However the dark current signal will increase by longer time, so >2 seconds are not recommended at normal ambient temperature.

To use this mode:

Set:

SW1-1, 2 and 3 to OFF

 

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 JP6 on PK8057 to CLOSE

Input:

Ext. VD pulses with the exposure interval to pin 7 on 12 pin multi connector.

 

Ext. HD to pin 6 on 12 pin multi connector.

 

75 Ohm termination is done with SW2-1 and SW2-2 on PK8057 board.

The timing for the external VD interval has to be as follow. (V is the time for a single field)

Interlaced with field accumulation.

1 V or more

Interlaced with frame accumulation.

2 V or integral number of 2V

Non-interlaced with field accumulation.

2 V or more

Note:The external HD/VD sync. generator, which supply the ext. VD an HD signals should follow the scanning standard for the camera setting.

 

EIA

Interlaced and field accumulation.

1 V = 262.5 H

Interlaced and frame accumulation.

2 V = 525.0 H

Non-interlaced and field accumulation.

2 V = 524.0 H

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”.

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Contents CV-M532 Declaration of Conformity Table of Contents General Standard CompositionMain Features Locations and Functions Type HR10A-7R-6PB Hirose male Seen from rear Pin Multi-connector DC-IN/SYNCPin Assignment External Trigger Mode Input/Output of HD/VD SignalNormal Shutter Mode Functions and OperationsEIA Non-interlaced / Field accumulation mode Edge pre-select mode for non-interlace onlyPulse Width Control Mode Pulse width control mode for non-interlace only Start/Stop Trigger Mode CV-M532 Long Time Exposure Mode EIACV-M532 Table for Shutter Time Mode SettingTable for SW 1 Setting SW2 on PK8057 Board Jumper Settings Pixel Clock OutputBoard PK8057 Side a Location of SW2 and JumpersBoard PK8054 Side B Adjustment of Video Signal Output Level VR4 VR3 VR5Head External AppearanceCCU Specifications Spectral SensitivityAppendix PrecautionsTypical CCD Characteristics Camera type CV-M532 Scanning system Users Mode Settings Users ModificationsUser’s Record Revision Revision E Serial No