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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