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Title: Theory And Traceability Of The Wavetek 9100 Active Impedance Function
Author: Peter Crisp
Source: 2000 Measurement Science Conference
Year Published: 2000
Abstract: Modern multi-function calibrators have to support a very wide range of calibration products ranging from simple analogue meters to complex multi-function DMMs. The range and functionality are so diverse that it is becoming increasingly difficult to support the cost-effective calibration of these instruments using simple calibration standards. To be able to address the workload effectively, the Wavetek 9000 and 9100 Multi-product calibrators feature active impedances to source the resistance and capacitance functions. Active impedance offers several advantages over conventional passive standards, these are wider range, variable output, programmability and the ability to remove the effects of connecting lead impedances. The latter is particularly important as much of the UUT workload are two terminal devices. This paper examines the theory of operation of the active impedance function, its traceability methods and uncertainty considerations.

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