External Trigger Delay Function; Trriger Output; Global Exposure Timing Output; Programmable Timing Output - Hamamatsu Photonics C11440-10C Instruction Manual

C11440-10C Ver.1.2
9-5-5

EXTERNAL TRIGGER DELAY FUNCTION

In most case when a delay between the laser pulse emission and the exposure start is needed, a
delay unit is set between the laser and camera to control trigger timing. In each external trigger
mode of the camera, the delay time can be set to the trigger signal input to the camera by
commands. Therefore, a range of trigger can be arranged without a delay unit.
9-6

TRRIGER OUTPUT

The camera provides a range of trigger output signals to synchronize with an external
instrument, and the camera becomes the master and the external instrument the slave.
There are three different trigger output functions as follows. Please refer to Figure 9-3 to
Figure 9-13.
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Global exposure timing output

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Programmable timing output

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Trigger ready output

These three different trigger output functions can be selected by software command, and they
are output from PIN5 of timing I/O connector (Refer to Figure 13-2)
9-6-1 GLOBAL EXPOSURE TIMING OUTPUT
It shows the global exposure timing where all lines expose at the same time. There is a case
that one event is divided into two frames because the timing of the exposure in each line is
different for the rolling shutter. However, by using the Global exposure timing output the
global exposure becomes possible for the phenomenon that happens for this period. Global
exposure timing output shows the period where all lines expose at the same time.
9-6-2 PROGRAMMABLE TIMING OUTPUT
By using the programmable timing output, synchronizing external devices is simple. A system
that needs simple timing signal does not require a delay unit nor pulse generator. It is possible to
program and output a pulse that has an optional pulse width and an optional delay time to the
exposure start timing of the camera by command.
The setting range for delay time is 0 µs to 10 s, and the setting range for pulse width is 20 µs to
10 s.
9-6-3 TRIGGER READY OUTPUT
The trigger ready output is useful to make the frame intervals as short as possible in external
trigger mode. For example, when the camera is working in the edge trigger mode, the next frame
can start after the previous frame exposure is done. Thus, the camera can't accept a trigger for
the next frame during the exposure period. To reduce useless time to be as short as possible, it
is necessary to know the period when the camera can accept a trigger for the next frame. The
trigger ready output shows the trigger ready period when the camera can accept an external
trigger in the external trigger mode.
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