Pulse Width Control Mode - JAI CV-A2 Operation Manual

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:
Input:
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.
No equalize and serration pulses.
Table showing the figures for the different modes.
A
Scan mode
Full 3H 20H
1/2 Partial 21H 36H
1/3 Partial 21H 36H
1/6 Partial 21H 36H
V binning 3H 20H
Trigger mode "Pulse Width Controlled"
Polarity and other functions
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).
B C
CCD array line #
8 to 1227
314 to 923
415 to 822
517 to 720
26+27 to 1212+1213
Fig. 20. Pulse Width Control trigger mode
CV-A2
D E
Effective video
1220H 18H
610H 29H
408H 29H
204H 29H
594H 18H
- 14 -
TR = 2
1H=53.1µs.(1920 clk)
Max frame rate Remarks
fps
15
28
40
70
30