In the SPC SQC analysis , if only one specification Limit is defined and i want the SPC analysis to ignore the other specification limit, ex: USL. How to do that?
It looks like a bug, that If we dont set the specification limit, the value defaults to zero while getting processed in the action block.
I tried setting nullnumber also but it doesnt work.
It takes the value as zero and generates the statistics results accordingly(CPK,PPK) . further it also generates alarms(False) based on this default value.
Ex: If LSL=96 and USL : NA then the SPC action blocks sets the value as 0 for USL and in the results if the datapoints are found to be say 98 it sets a alarm for its greater than 0 (USL), whereas it should have ignored it?
Further the CPK value generated is also found to be invalid because it considers the USL as 0.
(Atleast for the CPK value we can have work around to switch between CPL or CPU based on the one sided tolerance limit)
But can we disable the false alarm ?
Need help on the same.
-Karthik