CV-A2
6.7. Frame-delay read out Mode
In this mode the exposure starts from the leading edge of the trigger pulse. It stops at the
trailing edge of the trigger pulse. (Like PWC mode.) The accumulation is H synchronous. The
accumulation starts at the first HD pulse after the leading edge of the trigger, and it stops after
the first HD after the trailing edge of the trigger. It can result in <1H jitter if the trigger is not
synchronized to H.
The resulting video is read out after an external VD pulse is applied. (Delay < 2sec.)
This mode will operate with full and partial scanning and with vertical binning modes. If partial
scanning and binning is selected at the same time, partial scanning will have priority.
An EEN pulse will indicate the active accumulation time, and a WEN pulse indicates that the
resulting video is being read out.
To use this mode:
Set function:
Trigger mode “Frame-delay read out”
TR = 3
Polarity and other functions
Input:
Ext. trigger to pin 5 on 6 pin connector (or pin 11 on 12-pin connector).
Ext. VD to pin 7 on 12-pin connector.
Ext. HD to pin 6 on12-pin connector. (If used).
Important notes on using this mode.
•
The exposure will start synchronized to the internal H signal, the start of exposure may
be shifted max 1H. To avoid this shift (jitter), synchronize the camera to an external HD
and make sure that the trigger pulse aligns to the HD as shown in fig. 18.
•
The duration of the trigger can be>1H to<2000H.
•
A new trigger must not be applied before WEN is high.
•
In trigger modes there are no continuous VD out, only after each trigger input.
Table showing the figures for the different modes.
Binning
(CCD array line #)
Effective
video lines
Normal
8 to 1227
1220H
V binning
26+27 to 1212+1213
594H
Fig. 21. Frame Delay read out mode
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