Hi Brian,
Usually you can disassociate a DAQmx task with a custom scale by selecting <No Scale> in the Custom Scaling drop down box. This appears on the Task settings screen where you setup Maximum and Minimum values and so on. You can access this by double clicking on the DAQ Assistant.
In order to delete the custom scale altogether, remove the scale from the Scales menu in Measurement and Automation Explorer. Right click on the scale and click Remove to delete the scale from memory.
Hope this helps!
Abhinav T.
Applications Engineer
Abhinav T.
Applications Engineering
National Instruments India
LabVIEW Introduction Course - Six Hours
Getting Started with NI-DAQmx
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