JAI CV-M10 External Trigger Mode, Edge Pre-select Trigger Mode, Pulse Width Control Trigger Mode

CV-M10BX/CV-M10RS

6.3. External Trigger Mode

External trigger mode of CV-M10 allows 2 different driving modes:

1Edge Pre-select mode. (Asynchronous reset and exposure start by an ext. trigger)

2Pulse Width Control mode. (Exposure control by the low period of the ext. trigger)

For both there are two trigger modes. H reset and H non-reset. H non-reset mode allows input of synchronized external trigger and external HD.

The trigger input is AC coupled, so there is a maximum pulse width for the trigger pulse about 1 msec. The signal level must be 4.0V p-p +/- 2.0V on the input, which is non-terminated. The trigger input can be changed to 75 ohm by shorting JP10. See instructions in "8. Jumper Settings".

6.3.1. Edge Pre-select Trigger Mode

This trigger mode can operate in H reset mode or H non-reset mode.

In H reset mode the falling edge of the trigger will immediately reset the internal HD and start the exposure. The trigger input should be > 2 ∝ sec. to < 1 msec. If the camera is synchronized to an external HD, there are some requirements to the phase between the ext. HD and the Ext. trigger. The falling edge of the trigger should be within 4.4 msec. from the falling edge of the ext. HD. Otherwise the jitter will be too high. (See fig. 6.3)

In H non-reset mode the exposure will start at the first internal HD after the trigger. The trigger input should be > 64 ∝ sec. to

<1msec. An external trigger pulse initiates the capture, and the exposure time (accumulation time) is governed by the fixed shutter speed set up by the rear panel DIP-switches, (internal switch for BX version.) or via RS-232C. The resulting video signal will start to be read out after the selected shutter time. 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 been finished.

To use this mode

Set:	SW1-4 on BX rear to OFF for random trigger. For RS select trigger mode.
	JP12 on PK8206 (BX ver.) or PK8190 (RS ver.) OPEN for Edge Pre-select
	JP13 on PK8206 (BX ver.) or PK8190 (RS ver.) OPEN for H Reset
	JP13 on PK8206 (BX ver.) or PK8190 (RS ver.) Short for H Non Reset
		Ext.Trigger		2.0µs~1ms
	SW1-1 through SW1-3 on rear and SW1 on (BX) PK8206 for exposure time					4.±1.0V(pp)
Note:		Ext.HD	A A		A=4.4µAS
	For CV-M10RS the selection of Edge Pre-select, Pulse Width Control H Reset and H non-reset cannot be done by
	RS232C.
	(See chapter 7 and 8 for details)

6.3.2. Pulse Width Control Trigger Mode

This trigger mode can operate in H reset mode or H non-reset mode.

In H reset mode the exposure will start immediately at the falling edge of the trigger. (The internal H will not be reset). The exposure will end and the internal H will be reset at the rising edge of the trigger.

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 trigger. The exposure stops at the trigger rising edge. The trigger pulse can be anything between > 1H and < 625H. 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 of the trigger should be within 4.4 ∝ sec. from the falling edge of the ext. HD. (See fig. 6.3)

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