ICP DAS USA IM-100 - Manual (Page 16)

Level Controlled Exposure Mode
led mode is selected, the length of the exposure is
determined by Ex-Trig signal alone. If the camera is set for rising edge
When level control
triggering, exposure begins when the Ex-Trig signal rises and continues
until Ex-Trig signal falls. If the camera is set for falling edge triggering,
exposure begins when Ex-Trig signal falls and continues until Ex-Trig signal
rises.
Figure 1-12: Level Controlled Exposure with rising edge triggering
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