To find out if the measurements are drfting or changing from the previous HW Rev. of the product
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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?
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Hi Winnie,
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? -
Hi Henrik.
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.
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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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