Using CitectSCADA > Understanding Statistical Process Control > SPC Control Charts > Capability charts

Capability charts

The process capability chart is a frequency histogram and distribution of the sample data currently displayed (on the Mean chart). CitectSCADA automatically takes the data being trended, builds a distribution, adds the LSL and USL. It also calculates the Cp, Cpk, kurtosis, and skewness indices.

The process capability is defined in relation to the upper and lower specification limits (USL and LSL) for a given SPC Tag. These values are defined in SPC Tags and accurately represent the users requirements.

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