Figure 3. External Pulse Width Mode - Pulnix TM-7200 Operation Manual

OPERATION
FIGURE 3.
TM-7200/TM-6200 High Resolution Digital CCD Camera
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 H
(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.
External Pulse Width Mode
External
X
Pulse
Width
(Vinit)
Hd
Internal Vinit
Transfer Gate
Pulse
10H
Discharge
Pulse
Composite
Video
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.
and at 9th H timing from the external pulse leading edge
D D
9.5H
X
Exposure Time
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