STC-A33A
User Guide
24
Rev 1.0
D. H Reset Mode
Normally, the video noise appears when the start of the trigger signal is applied before finishing the video out of the previous
frame. This noise is caused by the SUB pulse, which is activated to clear all residual charges on the CCD prior to a new
e
xposure. By selecting “H reset mode”, the camera automatically holds the actual activation of the trigger until the next
horizontal blanking period. By doing this, the SUB pulse is activated during the horizontal blanking period and the noise in the
image can be avoided.
Note: Due to the principal of this operation, there can be a maximum 1H of delay of the actual trigger signal.
Next HD
Video out
SUB pulse
Internal HD
CCD exposure
Trigger signal
(Rising edge)
Noise
Normal SUB pulse timing
