Chapter 8 Gated Operation with a DG535 111
External Sync with Continuous Cleans
External synchronization can also use a function called Continuous Cleans (represented
by CC in the figure below). In addition to the standard “cleaning” of the array, which
occurs after the controller is enabled, Continuous Cleans will remove any charge that
integrates on the array after the Start Acquisition command has been sent to the ST-133
until the moment the External Sync pulse is received. As mentioned earlier in the manual,
values continuous cleans are entered on the Setup|Hardware …|Cleans/Skips tab
page. If the CCD has to wait more than a few seconds for the external trigger, it is
advisable to increase the number of cleans.
Figure 63. DG535: External Sync, PreOpen, Cont. Cleans, Exposure Time > 0 sec.
DG535 Gating Setup
In the WinX application, trigger, gating, and communication port parameters for the
DG535 are defined via the Setup|Pulsers|DG535 dialog box. The Triggers tab card
allows you to indicate whether the DG535 will use an internal trigger (occurring at X
frequency) to initiate an Ext. Sync trigger from its D output or whether the trigger source
will be a signal input at its Trig IN input.
Figure 64. DG535 Triggers tab
Gating parameters are set up via the Gating tab card and via the Repetitive Gating Setup
and Sequential Gating Setup dialog boxes that are accessed from this tab card. With
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