INTRODUCTION
The instability tests performed by QC-CALC are:
- Single Point outside the 3 Sigma, Control, or Specification limit
- 2 Sigma Exception
- 1 Sigma Exception
- Center Line Exception
Center Line Represents
You have the option of specifying exactly what the Center Line represents. The two choices are either the Nominal or a Fixed Average. This choice does not affect the appearance of your graphs. It is used solely in the computation of Trend Detection. The Center Line tells QC-CALC where to begin the Sigma Zones.
STEPS
- Choose Tools > Options.
- Expand list on left to the Trend Detection - Instability, Cp, Cpk group.
- Choose the trends you would like QC-CALC to detect.
- Optionally specify Actions or Report and Log if desired.
- Click OK to save changes when finished all changes.
- Check the Tools - Trend Detection menu to turn on the Trend Detection functionality in general.
MORE INFORMATION
See related article on Actions and Report and Log features of trend detection.