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                              HIGH RESISTANCE MEASUREMENTS


                                                      Karl-Peter Lallmann
                                                  Fluke Deutschland GmbH
                                                  Heinrich-Hertz-Strasse 11
                                                   34123 Kassel / Germany
                                                  Phone:++49 561 9594 651
                                                    Fax: ++49 561 9594 609
                                             E-mail: [email protected]



                                                              Abstract

This paper describes the accredited calibration methodology used in the Calibration Laboratory operated by
Fluke Germany. It is based on the use of a High-Ohms Resistance Bridge made by Measurement International
                                                                 
together with appropriate Resistance Standards from 10 k to 10 M from Guildline and Russian made
                                 
Resistance Standards from 100 M to 1G .  


                                                           Indroduction

The calibration of Standard Resistors in the range from 10 k to 1 G is based on the use of a High-Ohms Resis-
tance Bridge, model 6000B, made by Measurement International/Canada (MI) and the use of Standard Resistors
from 10 k to 1 G.
The Model 6000B from MI is a binary voltage divider which measures the ratio between the connected known and
unknown resistors with very low uncertainty. The ratio follows the following equation:

                                           RX V1 - V 2 V 1/E - V 2 /E r1 - r 2
                                      V=     =         =               =
                                           RN V 3 - V 4 V 3 /E - V 4 /E r 3 - r 4
The value of the unknown resistor is calculated as follows:

                                      R X = R N 

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