SPC Charts - X Chart Control Limits

Element Name	Description
Control Limits	Use this dropdown list to select the control limits type: None. If this option is selected, the analysis will not generate any control limits on the X chart. Use defined UCL and LCL If Use defined UCL and LCL option is selected, the analysis will look for variables named _UCL and _LCL for each characteristic (where '' is the name of the characteristic) and use the values in the respective variables as the Upper control limit and Lower control limit values. Each time the value in the _UCL or _LCL variable changes moving downward in the column, the system will create a new set on the X chart. If a value in the _UCL or _LCL variable is blank, the system will use the previous valid value found in the respective column. If no valid values are found in the _UCL variable, the Calculated UCL will be used as the X chart UCL value if you select the Calculate if defined limits are blank checkbox. If it is not selected, the chart will not have a UCL. If no valid values are found in the *_LCL variable, the Calculated LCL will be used as the X chart LCL value if the Calculate if defined limits are blank checkbox is selected. If it is not selected, the chart will not have a LCL. Calculate UCL and LCL Calculate UCL . If Calculate UCL option is selected, UCL value will be computed for the X chart and there will be no LCL. Calculate LCL. If Calculate LCL option is selected, LCL value will be computed for the X chart and there will be no UCL.
Check Control Limits	Select this checkbox to raise an alarm when a control limit violation is found.
Calculate if defined limits are blank	Select this checkbox to calculate the control limit under the following circumstances: Use defined UCL and LCL option was selected in the Control Limits checkbox above. The variable with the defined UCL or LCL has blank or invalid values.
Process Sigma Multiplier	Use this miniscroll to select a user defined process sigma multiplier for calculating the control limits on the X chart.
Control Limit Label type	Use this dropdown list to choose the Control limit label type from the following: Number only Text only Text and number None
Upper Control Limit label name	Use this text box to enter a label for the Upper Control limit when Text only or Text and number options are selected.
Lower Control Limit label name	Use this text box to enter a label for the Lower Control limit when Text only or Text and number options are selected.
Control Limit violation name	In this text box, enter the Control Limit Violation name to be used in the generated alarms spreadsheet and on the X chart legend. This name will be the added in graphs legends and spreadsheet results.

Control Limits

Use this dropdown list to select the control limits type:

None. If this option is selected, the analysis will not generate any control limits on the X chart.
Use defined UCL and LCL
- If Use defined UCL and LCL option is selected, the analysis will look for variables named *_UCL and *_LCL for each characteristic (where '*' is the name of the characteristic) and use the values in the respective variables as the Upper control limit and Lower control limit values.
- Each time the value in the *_UCL or *_LCL variable changes moving downward in the column, the system will create a new set on the X chart.
- If a value in the *_UCL or *_LCL variable is blank, the system will use the previous valid value found in the respective column.
- If no valid values are found in the *_UCL variable, the Calculated UCL will be used as the X chart UCL value if you select the Calculate if defined limits are blank checkbox. If it is not selected, the chart will not have a UCL.
- If no valid values are found in the *_LCL variable, the Calculated LCL will be used as the X chart LCL value if the Calculate if defined limits are blank checkbox is selected. If it is not selected, the chart will not have a LCL.
Calculate UCL and LCL
Calculate UCL . If Calculate UCL option is selected, UCL value will be computed for the X chart and there will be no LCL.
Calculate LCL. If Calculate LCL option is selected, LCL value will be computed for the X chart and there will be no UCL.

Check Control Limits

Select this checkbox to raise an alarm when a control limit violation is found.

Calculate if defined limits are blank

Select this checkbox to calculate the control limit under the following circumstances:

Use defined UCL and LCL option was selected in the Control Limits checkbox above.
The variable with the defined UCL or LCL has blank or invalid values.

Process Sigma Multiplier

Use this miniscroll to select a user defined process sigma multiplier for calculating the control limits on the X chart.

Control Limit Label type

Use this dropdown list to choose the Control limit label type from the following:

Number only
Text only
Text and number
None

Upper Control Limit label name

Use this text box to enter a label for the Upper Control limit when Text only or Text and number options are selected.

Lower Control Limit label name

Use this text box to enter a label for the Lower Control limit when Text only or Text and number options are selected.

Control Limit violation name

In this text box, enter the Control Limit Violation name to be used in the generated alarms spreadsheet and on the X chart legend. This name will be the added in graphs legends and spreadsheet results.