Figure 29. Timing Diagram: External Sync With Continuous Cleans - Princeton Instruments PI-MAX System Manual

Chapter 6
Further information about the sequence of events for External Synchronization is detailed
below based on Shutter Control setting, Clean Cycles, and Continuous Cleans
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Shutter Mode Operation

Figure 29. Timing Diagram: External Sync with Continuous Cleans

Ext Sync & Shutter Control = Normal
Normal clean cycles occur while waiting for the Start Acquisition command.
When it is received, a final clean cycle occurs and then the controller waits for
the Ext Sync to appear at its Ext Sync BNC. When it occurs, the photocathode is
biased on and signal of interest integration begins on the array. Dark charge
accumulates on the array in the time between the end of the last clean cycle and
the arrival of the Ext Sync.
Ext Sync & Shutter Control = PreOpen
Normal clean cycles occur while waiting for the Start Acquisition command.
When it is received, a final clean cycle occurs and the photocathode is biased on.
The controller waits for the Ext Sync to appear at its Ext Sync BNC. When it
occurs, the signal of interest integration begins on the array. Dark charge
accumulates on the array in the time between the end of the last clean cycle and
the arrival of the Ext Sync.
Ext Sync w/ Continuous Cleans & Shutter Control = Normal
Normal clean cycles occur while waiting for the Start Acquisition command. When it
is received, clean cycles continue to occur while the controller waits for the Ext Sync
to appear at its Ext Sync BNC. When it occurs, the current clean cycle goes to
completion, the photocathode is biased on, and signal of interest integration begins
on the array. Dark charge accumulation on the array is minimized during the time
between the receipt of the Start Acquisition command and the arrival of the Ext
Sync.
Ext Sync w/ Continuous Cleans & Shutter Control = PreOpen
Normal clean cycles occur while waiting for the Start Acquisition command.
When it is received, the photocathode is biased on and clean cycles continue to
occur while the controller waits for the Ext Sync to appear at its Ext Sync BNC.
When it occurs, the current clean cycle goes to completion, signal of interest
integration begins on the array. Ambient light and dark charge accumulation on
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