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Session Topic: 1E, DC Voltage

   

Paper Title: A Weighted Ensemble Method of Evaluating Unexpected Drift in DC Voltage Standards

   

Date & Time: MONDAY, August 5, 2002

 

10:45am - 12:15pm PARALLEL SESSIONS - SESSION 1

   

Speaker: Glen Hilderbrand American Airlines

Email: glen.hilderbrand@aa.com

   

In our previous 1998 NCSL paper “Improved Uncertainty in 10 Volt DC Standard Cells Using an Ensemble and Modified Uncertainty Predictions”, we looked at improved uncertainty for DC voltage standards using an ensemble with weighted averaging. Control charting techniques were also demonstrated as a way to track for individual DC voltage standards. This paper is a follow up to the original paper. It presents a method for determining if a particular DC voltage standard is drifting in an unexpected way. This approach compares the individual DC voltage standards own projected curve fit to the value predicted by a weighted ensemble of the remaining voltage standards. This weighted ensemble of the remaining standards has significantly less uncertainty than the individual standard and therefore provides a useful basis for determining if that standard has drifted unexpectedly. Data for a group of DC voltage standards using this comparison is included in this paper to show the practical value of this method.

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