Teledyne Princeton Instruments Nano-XF, System Manual

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34 Nano-XF System Manual Issue 5
6.2.3 Mode 6: Periodic Interval Triggering
This section provides information about Mode 6 operation.
6.2.3.1 Self-Trigger Overview
When the camera is in trigger periodic interval mode, the camera self-triggers on a
repeated cycle as long as the trigger mode is enabled. The interval is a user-defined
value. In periodic pulse mode, triggering the camera responds to a software 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 maximum pulse rate is related to the minimum time between triggers which is
approximately equal to the integration time plus the readout time.
6.2.3.2 Periodic Pulse Timing Sequence
Figure 6-7 illustrates the timing sequence in periodic pulse trigger mode. While waiting
for a trigger the sensor is continually being flushed of charge. 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 be pre-programmed with the
desired integration time. During the integration period, the sensor continues to be
flushed of charge. When the integration time expires the image is read from the sensor.
Figure 6-7: Mode 6: Periodic Interval Trigger Timing
6.2.3.3 Periodic Interval Timing Parameters
See Figure 6-7 .
• T
sd
(Strobe Delay)
This interval defines the delay from the receipt of trigger to the issue of the
Strobe Pulse.
The delay is under software control and is programmable from 1

s to 1 second
in 100 ns increments.
• T
sw
(Strobe Width)
The Strobe pulse Width is nominally 100

s.
The strobe polarity is under software control.
4
4
11
-0
11
6
_
0
16