SPC Charts - Specification Limits

Use this tab to define the following parameters:

Element Name Description
Specification Limits

In this dropdown list, choose whether specification limits will be disabled or specified:

  • None. The analysis will not generate any specification limits on the chart.
  • Use LSL, Nominal and USL
  • The analysis will look for variables named *_LSL, *_NOM and *_USL for each characteristic (where '*' is the name of the characteristic) and use the values in the respective variables as the Lower Specification Limit, Nominal and Upper Specification Limit.
  • Each time the value in the *_LSL or *_NOM or *_USL variable changes moving downward in the column, the system will create a new set on the chart.
  • If a value in the *_LSL or *_NOM or *_USL variable is blank, the system will use the previous valid value found in the respective column.  
Check Specification Limits Select this checkbox to raise an alarm if a specification limit violation is found.
Include Cpk in graph Select this checkbox to include the Cpk value on the graph, if specification limits are enabled.
Location of Cpk From this dropdown list, choose where to place the Cpk value:
  • Foot note
  • Main title
Include Ppk in graph Select this checkbox to include Ppk value on the graph if specification limits are enabled.
Location of Ppk dropdown From this dropdown list, choose where to place the Ppk value:
  • Foot note
  • Main title
Specification Limit label type From this dropdown list, choose the Specification limit label type on the chart:
  • Text only
  • Text and number
  • Number only
  • None
Upper Specification Limit label name In this textbox, enter the label for the Upper Specification limit when Text only or Text and number options are selected.
Lower Specification limit label name In this textbox, enter the label for the Lower Specification limit when Text only or Text and number options are selected.
Specification limit violation name In this textbox, enter the Specification limit violation name to be used in the generated alarms spreadsheet and on the chart legend.
Specification limit violation name In this textbox, enter the Specification limit violation name to be used in the generated alarms spreadsheet and on the chart legend.