Teledyne Princeton Instruments Nano-XF, System Manual

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28 Nano-XF System Manual Issue 5
6.2 Available Trigger Modes (Trigger State is ON)
Triggered acquisition can be configured for a variety of different operating modes.
These triggered modes provide different methods of controlling the start of image
acquisition and the duration of the integration time. When the trigger state is OFF, the
camera is in continuous, free run or "video mode." When trigger state is ON, the user
can select from the following modes:
0 = Edge Triggering (Asynchronous Reset with Programmable Integration)
1 = Level Triggering (Asynchronous Reset with Pulse Width Controlled Integration)
6 = Periodic Interval Triggering (Self Trigger)
6.2.1 Mode 0: Edge Triggering
This section provides information about Mode 0 operation.
6.2.1.1 Asynchronous Reset with Programmable Integration Overview
In this mode the active edge (first edge) of EXT TRIG initiates the start of a
programmable integration time. At the end of the integration time the readout takes
place. After the readout, the system is ready for another EXT TRIG signal. See
Figure 6-2
Figure 6-2: Timing Diagram: Mode 0, Edge Trigger, Programmable Integration
6.2.1.2 Mode 0 Edge Triggering
In Edge mode triggering, the camera responds to a trigger edge by clearing the sensor
photosites and letting the sensor integrate for a preset length of time. At the end of the
integration time, the image data is read from the sensor.
The minimum time between triggers is approximately equal to the integration time plus
the readout time. Refer to
Table 6-5, Mode 0: Typical Readout (T
read
) Times , on page 30
for readout times for the Nano-XF:11000 camera.
6.2.1.3 Mode 0 Timing Sequence
In this mode, the sensor is continually being flushed of charge while waiting for a
trigger. When a trigger arrives via the rear panel, the photosites are cleared and a strobe
is issued out of the rear panel. At the end of the CLEAR cycle, a timer is started which
has been pre-programmed with the desired integration time. During the integration
period the sensor continues to accumulate charge. When the integration time expires
the image is read from the sensor.
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