SPC Control Limits in Sample Definitions

Selecting Control Limits

Under Sample Definition Settings, click to select one or more Control Limits from the list (these are often selected in pairs – one for an upper limit and one for a lower limit). Any selected Control Limits will be available to include on the control charts and will also be included in the automatic evaluation of out of control conditions of the sample data.

When a new project is created, the default Control Limit options are created, but they can be modified, added to or removed. Keep in mind that each Control Limit is associated with a particular control chart. For example, XBar UCL is associated and can only be used with the XBar Chart. This is because the calculation used to determine the XBar UCL value is specific to only the XBar Chart.

After all the desired settings have been defined, select Save to commit all the changes or Cancel to undo any changes that have been made.  After a Sample Definition has been created, samples based on them may begin to appear or can be manually added depending on the Interval setting.

For more information

See: What is a Control Limit?