CV-A1
6.8. Long Time Exposure Mode
The exposure time is the interval between 2 external VD pulses sent to the VD input. The exposure starts after the input of a VD, and it ends after the next VD input, which again starts a new exposure. The interval between the external VD pulses (exposure time) can be from V to ∞. Thermal and dark current noise will increase by accumulation time, therefore the exposure time is not recommended to exceed 2 seconds (or 30 V periods). The external applied sync system should follow the camera scan system.
The long time exposure is a continuous process where each external VD pulse will synchronize the camera, stop an exposure, start a new exposure and read out the previous accumulated video signal.
A WEN pulse indicates that the resulting video is being read out.
To use this mode: |
|
|
Set function: | Trigger mode “Long Time Exposure” | TR = 4 |
| Polarity and other functions |
|
Input: | Ext. VD to pin 7 on |
|
| Ext. HD to pin 6 |
|
Important notes on using this mode.
•Depending of the temperature, it is not recommended to use integration time >2 sec.
No equalize and serration pulses.
No equalize and serration pulses.
Fig. 23. Long time exposure
- 14 -