Filter
Top Products
58 PI-SCX System Manual Version 2.E
58
Note: If EXT SYNC is still active (in Figure 25, this means that if it is still LOW) at the
end of the readout, the hardware may interpret this as a second sync pulse, and so on.
Figure 25. Timing Diagram for the External Sync Mode (- edge trigger)
External Sync with Continuous Cleans
Another timing mode available with the ST-133 controller is called Continuous Cleans.
In addition to the standard "cleaning" of the array, which occurs after the controller is
enabled, Continuous Cleans will remove any charge from the array until the moment the
External Sync pulse trigger edge is received.
Figure 26. Continuous Cleans Operation Flowchart
Once the External Sync pulse trigger edge is received, cleaning of the array stops as soon
as the current row is shifted, and frame collection begins: a delay time of up to one row
shift can be expected. With Normal Shutter operation the shutter is opened for the set
exposure time. With PreOpen Shutter operation the shutter is open during the continuous
cleaning, and once the External Sync pulse trigger edge is received, the shutter remains
open for the set exposure time, then closes. If the vertical rows are shifted midway when
the External Sync pulse trigger edge arrives, the pulse is saved until the row shifting is