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SPC control chart

Hi Gurus,

I have a issue where my control limits were not considered at the time of results recording automatically apart from the spec limits, The system is not showing as defect even though it is above the control limits.

Ex: if the upper and lower spec limits are 70 and 50, I have set the control limits as 67 and 53. I assume if I input the value 68 at the time of results recording, it should say a defect. But it is treating the characteristic as accepted.

Please let me know if I'm missing something,  I have made the following checks:

QGC2 control chart is active and the control limits, warning limits exist for the characteristics, The characteristic is having a SPC sampling procedure.



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1 Answer

  • Dec 30, 2014 at 07:21 AM

    Hi Pavan, where are you putting these control limits 53-67? Does this indicate to lower and upper plausibility limits respectively?

    I believe the main lower and upper specification limits are the main criteria to decide whether the reading is within tolerance range or not. Entering Plausibility Limits ensure that you are not putting the value that is too small or too large as compared to main tolerance range. It throws a warning message accordingly while result recording.


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