Trigger Width Exposure Mode - GigE VA Series User Manual

VA GigE series
8.6.2

Trigger Width Exposure Mode

When the Trigger Width mode is selected, the exposure time is controlled by the external trigger signal.
The camera generates a shutter signal to clear pixels when an external trigger signal is applied. The exposure
time begins when the shutter signal falls and continues until the tpd (Photodiode Transfer) signal falls. As Figure
8.10 shows, there is an Exposure Start Delay (refer to Table 8.3) between the rise of the external trigger signal
and the rise of the shutter signal. There is difference between the width of the external trigger signal and the
exposure time as much as the t value of the shutter signal and Transfer Pulse Offset value (t , t ).
sub pd 3p
You can calculate an actual exposure time by using the following formula:

Exposure Time = Trigger Width + t + t - t
3p pd sub
Figure 8.10 Real Exposure with Trigger Width Exposure Mode
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