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Cp and CpK are called Process Capability. Cp and CpK are considered short-term potential capability measures for a process.

 

Cp and Cpk measure your consistency compared to your average performance. Cpk tells us what a process can do in the future, assuming it remains in a state of statistical control.

 

Process capability:

Cp = (USL - LSL) / 6σ

 

Process capability index:

CpK = min(u - LSL, USL - u)) / 3σ

 

USL = Upper alarm limit.

LSL = Lower alarm limit.

σ = standard deviation.

u = mean.

 

Meaning if no limit is set, no Cp and CpK data will be shown in the RMS statistics.

 

Updated: 12.01.2024.