9
4.3 Strobe
Set NRM/ASM switch to ASM mode and make sure the FRM/FLD switch on rear panel is set to FRM mode in
order to achieve full frame resolution. The strobe application is similar to high-speed shutter application except
the strobe pulse must occur in the dark and no shutter is required. The advantage to use strobe is that a full
frame resolution of video will be obtained. This will not happen when high-speed shutter is applied; a progressive
scan or full frame CCD camera must be utilized. The relationship between external VD and strobe pulse signal is
shown in figure 10 below. Make sure to fire strobe pulse between 1H and 8H when internal VD is at 0V or GND,
where 1H = 63.5
µ
sec. After strobe pulse is fired, camera will output only two vertical sync signals. The two sync
signals allow the user to capture the following valid fields. Therefore, the camera will not have any vertical sync
or video if there is no reset pulse on external VD pinout.
Figure 11. Strobe Timing
