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6.4.4. Frame Delay Readout PWC
This trigger mode operates in H non-reset mode. In H non-reset mode the trigger and HD is
synchronized. The exposure will start at the first HD pulse after the falling edge of the external
trigger signal. The exposure ends 0.5 H after the HD following the rising edge of the external
trigger signal. The trigger pulse must be longer than >1H. To avoid jitter, the camera should be
synchronized to an external HD. There are some requirements to the phase between the ext. HD
and the Ext. trigger. The falling and rising edge off the trigger should be within 8
µ
sec. before
the falling and rising edge of the ext. HD pulse and not later than 2
µ
sec after the falling and
rising edge of the HD pulse (see fig. 14.). The EEN pulse indicates the actual exposure time.
The resulting video signal will first start to be read out after the input of an external VD signal.
The readout delay should not be to long due to visible dark current noise generated in the CCD
sensor. The WEN pulse indicates the start of valid video signal. Refer to timing charts for details.
A new trigger pulse must not be applied before the video read out has finished.
Mode setting and all other settings can be done via RS 232C control if rear switch SW1-10 is ON.
Mode setting and some other settings can be done by switch if rear switch SW1-10 is OFF.
For details: refer to “7. Configuring the Camera”.
To use this mode:
RS
SW1-
Set function: Trigger mode to “Frame Delayed readout PWC”
TR=5
1, 2, 3 ON
Polarity and other functions
Input:
Ext. trigger in on pin 5 on 6-pin con. (Or 11 on 12 pin). 4.0 Vp-p ±2.0V.
Ext VD on pin 7 on 12 pin con. (Or 1 on 9 pin ). 4.0 Vp-p ±2.0V.
Ext. HD in on pin 6 on 12-pin connector. 4.0 Vp-p ±2.0V.
(If used).
Important notes on using this mode
•
The start of exposure will start synchronized to the internal H signal. The start may be
shifted max 1H. To avoid this shift (1H jitter), synchronize the camera to an external HD
and make sure that the trigger pulse aligns to the HD as shown in fig. 14.
•
The trigger pulse width should be >2H to <2000H.
•
External sync system should follow the camera scanning system.
•
A new trigger must not be applied before WEN is high.
Fig. 18. Vertical timing for Frame Delay readout PWC
