Fixed Limit Control Charts in Excel

Use a Fixed Limit Control Chart to Input Historical Control Limits or Spec Limits

The Fixed Limit chart works just like any other control chart except that it uses historical control limits or specification limits that you input instead of calculated control limits.

Here is an example of a Fixed Limit Control Chart created using QI Macros for Excel.

Fixed Limit Control Chart

The Fixed Limit control chart can help you evaluate a process using historical control limits or specification limits. To create a Fixed Limit control chart simply:

  • Select one or more columns or rows of data.
  • Click on the Fixed Limit Control Chart.
    QI Macros Fixed Limit Control Chart
  • Enter the fixed Upper Limit (UL) and Lower Limit (LL).
    input historical or fixed control limits
    The Center Line (CL) will be calculated as midway between the two.

    If the Lower Limit is zero, you will be asked to enter the Center Line as well. This is mainly for attribute data which may have a lower limit of zero, but the Center Line is not centered between the upper and lower limits.
To create a Fixed Limit Control Chart using QI Macros...
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