To find out if the measurements are drfting or changing from the previous HW Rev. of the productAnswered
In the same testing step of the same product, saying HW Rev. A, and HW Rev B, the mean value of the Rev B is different by more than 20% from that of Rev A, could WATS be able to give a warning to the users that this maybe a potential problem even the measurements in both of Rev A and B are still in the limits?
At the WATS UP conference we discussed to implement "more automatic" SPC using http://en.wikipedia.org/wiki/Western_Electric_rules.
In your case, would this help you get the warnings if we implemented a report running the Western Electric Rules?
You can perform deep trend analysis on measurement in WATS. In Test Step yield & analysis you can group your measurements by revision or other interesting header fields. For more information, watch the video in TSY-A-Details-View.
I am also looking for a feature that Alarms and Notifies the WATS user when a measurement "behaves strange" by moving away from its "normal" value fx when starting use of a new batch of (possibly bad) components. But measurement/unit still passing tests. To use it as an early warning.
It should be possible to define a range either % of tolerance fx when a measurement moves out of the inner 80% of the tolerance or when a Cp or Cpk value becomes too low to be notified by alerts.
To get the trend it could be a moving average with a definition of how many measurements the trend should be based on.
This could also be used in the Dashboard view. To monitor selected sensitive measurements. Presented with step/measurement name, not like the favorits in the present Cpk overview.
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