224 PI-MAX/PI-MAX2 System Manual Version 5.F
choices of Shutter Type (Hardware Setup|Controller/Camera tab card) are
"Electronic" and "None". When "Electronic" is selected, 6 msec is inserted to allow
time for the phosphor to decay: this choice is appropriate for a P43 phosphor. No
time is inserted when "None" is selected: this choice is appropriate for a P46
phosphor.
Shutter Mode: PI-MAX intensifier mode in which the photocathode is biased on at
during the exposure time and is biased off before the array is read out.
Timing Mode: A timing mode determines how data acquisition is synchronized with an
experiment. The timing modes associated with a PI-MAX system are: Free Run,
External Sync, External Sync with Continuous Cleans, and Internal Sync.
Vertical Shift Time (µs): Reports the speed (in microseconds) at which a single row will
be shifted vertically. This information is based on the value in the Vertical Shift box.
The higher the value in that box, the longer the vertical shift time. This information
appears for the Frame Transfer and Kinetics modes.
Vertical Shift: Determines the speed of the image transfer from the exposed area of an
array to the masked area. Setting a lower value increases the shift speed. A higher
value gives a slower shift. If the shift is too fast, not all of the charge will be
transferred. If too slow, image smearing will be increased due to the exposure that
takes place while the transfer is in progress. The default value gives good results in
most measurements.
Window Size: Specifies the height of the window for Kinetics mode and should be equal
to the height of the unmasked area of the array. This value must be 1 or greater.
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