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4 Functionality
The timing of the rising edge of the trigger pulse until to the start of exposure and strobe is
equal to the timing of the camera controlled exposure time (see Section 4.6.3). In this mode
however the end of the exposure is controlled by the falling edge of the trigger Pulsewidth:
The falling edge of the trigger pulse is delayed by the time t
which is results from the
d iso input
signal isolator. This signal is clocked into the FPGA which leads to a jitter of t
. The pulse is
jitter
then delayed by t
by the user defined value which can be configured via camera
trigger delay
software. After the trigger offset time t
the exposure is stopped.
trigger offset
4.6.4 Trigger Delay
The trigger delay is a programmable delay in milliseconds between the incoming trigger edge
and the start of the exposure. This feature may be required to synchronize the external strobe
with the exposure of the camera.
4.6.5 Burst Trigger
The camera includes a burst trigger engine. When enabled, it starts a predefined number of
acquisitions after one single trigger pulse. The time between two acquisitions and the number
of acquisitions can be configured by a user defined value via the camera software. The burst
trigger feature works only in the mode "Camera controlled Exposure Time".
The burst trigger signal can be configured to be active high or active low. When the frequency
of the incoming burst triggers is higher than the duration of the programmed burst sequence,
then some trigger pulses will be missed. A missed burst trigger counter counts these events.
This counter can be read out by the user.
The burst trigger mode is only available when TriggerMode=On. Trigger source is determined by
the TriggerSource property.
The timing diagram of the burst trigger mode is shown in Fig. 4.40.
.
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