Andor Technology iXon Ultra 897 User Manual page 75

SETTING THE AQUISITION
You may select a Vertical Shift Speed (the speed with which charge is moved
Vertical Shift Speed
down the CCD-chip prior to readout) from a drop-down list box on the CCD Setup
Acquisition Dialog Box. The Vertical Shift Speed you select will affect the
minimum exposure and cycle times available. Note: Using a fast Vertical Shift
Speed can lower the well depth of your CCD, increase noise, and cause a drop in
charge transfer efficiency. Please consult the On Line Help for further details on
this, including Vertical Clock Voltage Amp.
The CCD-chip is continually being scanned to prevent its becoming saturated with Keep Cleans
dark current. Scanning involves moving charge from the CCD-chip into the shift
register and then emptying the shift register. If the scan is being used simply to
clean the CCD-chip (i.e. it is a keep-clean scan), the charge that is emptied from the
shift register is not stored in memory and is, in effect, discarded.
While running an Accumulate or Kinetic acquisition, use the Keep Clean Text box
to enter a minimum number of Keep Cleans between each scan in the series.
Section 4 . 5
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