Photon Focus MV1-D1280-L01-1280-G2-12, User Manual, Page: 53 / 139

5.2 Trigger and Strobe
t
trigger − offset
results then from the synchronous design of the FPGA state machines and from to
requirement to start an exposure at a fixed point from the start of the read out of a row. The
exposure time t
exposure
is controlled with an internal exposure time controller.
The trigger pulse from the internal camera control starts also the strobe control state machines.
The strobe can be delayed by t
strobe
−
delay
with an internal counter which can be controlled by
the customer via software settings. The strobe offset delay t
strobe
−
delay
results then from the
synchronous design of the FPGA state machines. A second counter determines the strobe
duration t
strobe
−
duration
(strobe-duration). For a robust system design the strobe output is also
isolated from the camera electronic which leads to an additional delay of t
d
−
iso
−
output
Table 5.4
gives an overview over the minimum and maximum values of the parameters.
5.2.5 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.
5.2.6 Strobe Output
The strobe output is an isolated output located on the power supply connector that can be
used to trigger a strobe. The strobe output can be used both in free-running and in trigger
mode. Strobe settings:
Strobe_Delay Programmable delay delay from the active input trigger edge to the rising edge
of the strobe output signal.
Strobe_PulseWidth Width of the trigger pulse in
µ
s. A setting of 0 turns off the strobe output.
Strobe_Invert Inverts the strobe output signal. Strobe_Invert=False: strobe signal active high,
Strobe_Invert=True: strobe signal active low.
The strobe output needs a separate power supply. Please see Section 7.7, Fig.
5.14 and Fig. 5.15 for more information.
5.2.7 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. 5.17.
.
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