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Session Topic: 1E, DC Voltage

   

Paper Title: Verifying Precision Voltage Dividers and High Resistance Ratio Bridges Using a Josephson Voltage Standard

   

Date & Time: MONDAY, August 5, 2002

 

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

   

Speaker: Neil Faulkner Fluke Precision Measurement

Email: neil.faulkner@fluke.com

   

Directly verifying the ratio accuracy of precision voltage dividers, which have a specification around 0.1 to 0.2 ppm at a division ratio of 10:1, is very challenging. A Josephson Voltage Standard (JVS) has the required uncertainty for the measurements but the output resistance of these dividers is high enough (>40 kOhm) that a direct measurement of the divider output with the JVS has high uncertainties. A method is described using a second low resistance divider yielding acceptable uncertainties with the JVS. The results of the measurements on two models of dividers are given. This method can also be used to verify high resistance ratio bridges. Also discussed are refinements that were made to the Fluke JVS in Everett, Washington to reduce the uncertainty of measurement at 1 V and below.

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