A new wattmeter for traceable power measurements at audio frequencies

Author

Pickering, J.R. ; Wright, P.S.

Author_Institution

Metron Designs Ltd., Norwich, UK

Volume

44

Issue

2

fYear

1995

fDate

4/1/1995 12:00:00 AM

Firstpage

429

Lastpage

432

Abstract

This paper describes the development of a wattmeter designed for traceable power measurements to 30 kHz and above. A description is given of a technique, which uses the three rms values of voltage, current and sum of voltage and current-to-measure power. The resulting system is based around an analog signal processor, which provides signal ranging and isolation. The design of the signal processor includes several unique aspects. Traceability is achieved by characterization of each stage of the system; this, together with the overall measurement uncertainties, is reported. The results of comparisons with other standards are given

Keywords

analogue processing circuits; measurement errors; measurement standards; power measurement; signal processing equipment; wattmeters; 30 kHz; analog signal processor; audio frequencies; current-to-measure power; isolation; measurement uncertainties; rms values; signal isolators; signal processor; signal ranging; summing amplifier; traceability; traceable power measurement; wattmeter; Current measurement; Frequency measurement; Instruments; Power measurement; Signal design; Signal processing; Switched-mode power supply; Voltage; Voltmeters; Wattmeters;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.377871

Filename

377871