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 the control limits are input not calculated from the data. Most users use a fixed limit chart to evaluate a process using historical control limits or specification limits.

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

fixed limit control chart

To create a Fixed Limit control chart using QI Macros for Excel:

  • Select your data
  • Click on the menu QI Macros installs on Excels tool-bar and select Control Charts » Fixed Limit.
  • QI Macros will prompt you to enter the fixed Upper Limit (UL) and Lower Limit (LL):
  • upper control limit prompt

    lower control limit prompt

    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.

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