B-Alert in AcqKnowledge 4.4.1 and earlier: Attempting to record data after disabling the “Use B-Alert Definition File” option generates an “acquisition cannot continue” error message.
Note that this issue is common only to AcqKnowledge versions 4.4.1 and earlier.
This issue can occur under the following circumstances:
Launch AcqKnowledge and create a B-Alert graph.
Select B-Alert > Set Up Data Acquisition > Length/Rate and verify that a definition file has been assigned.
Uncheck the “Use B-Alert Definition File” box and close the acquisition setup dialog.
A “Brain state definition file is required for one of the selected channels” message appears. Dismiss this dialog by clicking OK.
Click the Start button.
A second message appears: “There is an error with calculation channel C0. The acquisition cannot continue.”
This error occurs because when a definition file is assigned, calculation channels C0-C7 are automatically enabled to accommodate the Brain State Gauge data. If the “Use B-Alert definition file” is subsequently disabled, these calculation channels remain active even though the definition file is no longer being referenced. If this issue occurs, the following work-arounds are available:
A. Enable the “Use B-Alert Definition File” option and rerun the acquisition.
B. If the definition file is not to be used, disable calculation channels C0-C7 prior to recording:
Select B-Alert > Set Up Data Acquisition > Channels and click the “Calculation” tab.
Uncheck the “Acquire” box for channels C0-C7 and rerun the acquisition.
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