Pulnix TM-7200 Instrukcja Obsługi Pobierz pdf (Strona 19)

OPERATION

TM-7200/TM-6200 High Resolution Digital CCD Camera Page 11

There are three modes to control the asynchronous reset and shutter speed, External Pulse Width Mode,

Internal Fast Reset Mode and Internal Slow Reset Mode.

3.1.2 (a) External Pulse Width Mode

The TM-7200/TM-6200 can be reset with external reset pulse (VINIT). Set the dial switch to “9”.

Apply a pulse width control VINIT signal generated from an external event trigger to the camera The

internal reset pulse will be latched to HD and at 9th HD timing from the external pulse leading edge

(negative going edge). The CCD discharge pulse will be generated to clear the images. The internal

VINIT will be generated at the following edge (positive going edge) of the external pulse, resetting the

internal timing including the video sync. The shutter speed is the same as the external pulse width, but

the integration delays 9H from the leading edge.

FIGURE 3. External Pulse Width Mode

For the progressive format, one frame of video output will start from the rising edge of the pulse width

control. The camera will output the same video from memory when VINIT is kept high (5V), then

update the image upon receiving the next pulse. At async mode with external pulse input high, the video

output will be disabled as the camera continues discharging the CCD image providing black video only.

This feature is especially important in capturing moving objects at the precise location of the ﬁeld of

view, such as belt conveyer, fast event observation and still image capturing.

10H

Internal Vinit

Transfer Gate

Pulse

Discharge

Pulse

Composite

Video

Exposure Time

External

Pulse

Width

9.5H

(Vinit)

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 39 40

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Pulnix TM-7200 Instrukcja Obsługi Strona 19