Figure 22. Free Run {No Response} Timing Chart, Part Of The Chart In Figure 30; Figure 23. Free Run {No Response} Timing Diagram - Princeton PIXIS-XB System User Manual

Chapter 6 Advanced Topics 49
Free Run {No Response}
In the Free Run {No Response} mode the
camera does not synchronize with the
experiment in any way. The shutter opens as
soon as the previous readout is complete, and
remains open for the exposure time, t . Any
exp
External Sync signals are ignored. This mode
is useful for experiments with a constant light
source, such as a CW laser, an X-ray source,
or a DC lamp. Other experiments that can
utilize this mode are high repetition studies,
where the number of shots that occur during a
single shutter cycle is so large that it appears
to be continuous illumination.
Other experimental equipment can be
synchronized to the camera by using the
software-selectable output signal SHUTTER
{Normal} or NOT SCAN {Not Reading Out}
on the Hardware Setup|Controller Camera
tab { Trigger/Shutter expander} from the
LOGIC OUT connector. Shutter operation and
Figure 22. Free Run {No Response} Timing
Chart, part of the chart in Figure 30
the NOT SCAN {Not Reading Out} output
signal are shown in Figure 23.

Figure 23. Free Run {No Response} Timing Diagram

External Sync {Readout Per Trigger}
In this mode all exposures are synchronized to an external source. As shown in the flow
chart, Figure 24, this mode can be used in combination with Normal or PreOpen {Open
Before Trigger} shutter operation. In Normal Shutter {Normal} mode, the camera waits
for an External Sync pulse and then opens the shutter for the programmed exposure
period. As soon as the exposure is complete, the shutter closes and the CCD array is read
out. The shutter requires up to 8 ms or more to open completely, depending on the shutter
model.
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