CV-A2
6.6. Pulse Width Control 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, and the resulting video is read out. 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 fist HD after the trailing edge of the trigger. It can result in <1H jitter if
the trigger is not synchronized to H.
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 “Pulse Width Controlled”
TR = 2
Polarity and other functions
Input:
Ext. trigger to pin 5 on 6 pin connector (or pin 11 on 12-pin connector).
Ext. HD to pin 6 on12-pin connector. (If used).
Important notes on using this mode.
•
With HC=0 the start of exposure will start synchronized to the internal H signal. The start
may be shifted max 1H. To avoid this shift (1 H jitter), synchronize the camera to an
external HD and make sure that the trigger pulse aligns to the HD as shown in fig. 18.
With HC=1 the exposure will start immediately.
•
The duration of the trigger can be >1H to <2seconds.
•
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.
1H=53.1
µ
s.(1920 clk)
No equalize and serration pulses.
Table showing the figures for the different modes.
Scan mode
A
B
C
CCD array line #
D
Effective video
E
Max frame rate
fps
Remarks
Full
3H
20H
8 to 1227
1220H
18H
15
1/2 Partial
21H
36H
314 to 923
610H
29H
28
1/3 Partial
21H
36H
415 to 822
408H
29H
40
1/6 Partial
21H
36H
517 to 720
204H
29H
70
V binning
3H
20H
26+27 to 1212+1213
594H
18H
30
Fig. 20. Pulse Width Control trigger mode
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