Photon Focus MV1-D2080(IE) Series, Руководство пользователя, Страница: 57 / 119

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 4.4.4). 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
d
−
iso
−
input
which is results from the
signal isolator. This signal is clocked into the FPGA which leads to a jitter of t
jitter
. The pulse is
then delayed by t
trigger
−
delay
by the user defined value which can be configured via camera
software. After the trigger offset time t
trigger − offset
the exposure is stopped.
4.4.5 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.
4.4.6 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. 4.30.
4.4.7 Strobe Outputs
There are two isolated outputs on the power supply connector that can be used to trigger
external devices, such as a strobe device or another camera (see also Section 5.2.3 and Section
6.10):
ISO_OUT0 / Strobe: The strobe output can be used both in free-running and in trigger mode.
It is triggered by the internal trigger. The pulse width can be adjusted with
Strobe_PulseWidth and There is a programmable delay Strobe_Delay available to adjust the
strobe pulse to your application.
ISO_OUT1: This output is connected to the PLC Q1 output (see also Section 6.10).
The ISO outputs need a separate power supply. Please see Section 5.2.3, Fig. 4.26
and Fig. 4.27 for more information.
.
4.4 Trigger and Strobe 55