JAI CV-A1-20 operation manual Pulse Width Control Mode, Pulse Width Control trigger mode

CV-A1-20

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 can be either H synchronous or H asynchronous. HC=0 or HC=1. In H synchronous mode the accumulation starts at the first HD pulse after the leading edge of the trigger. It can result in <1H jitter if the trigger is not synchronized to H. In H asynchronous mode the accumulation starts immediately after the leading edge of the trigger. (The internal H is not reset.)

This mode will operate with full and partial scanning and with all binning modes. Partial scanning together with binning will work, but it is not described, and no timing diagrams are documented. 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
	“H accumulation”	HC=0 or HC=1
	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. 17. With HC=1 the exposure will start immediately. Refer to fig. 18 and fig. 19.

•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.

1H = 83.6 ∝s

No equalize and serration pulses.

Table showing the figures for the different modes.

	A	B	C	D	E	Max frame rate	Remarks
Scan mode			CCD array line #	Effective video		fps
Full	10H	14H	4 to 1038	1035H	18H	11
1/2 Partial	17H	33H	271 to 783	513H	25H	20
1/3 Partial	17H	33H	357 to 697	341H	25H	28
1/6 Partial	17H	33H	442 to 612	171H	25H	46
H binning	10H	14H	4 to 1038	1035H	18H	11
V binning	10H	14H	18 to 1019	501H	18H	22
V+H binning	10H	14H	18 to 1019	501H	18H	22

Fig. 21. Pulse Width Control trigger mode

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