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Title: The measurement of total harmonic distortion
Author: Hopkin, A. J.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1983
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This thesis discusses the design of an instrument that will measure Total Harmonic Distortion (T.H.D.) over the range 20 hertz to 100 kilohertz and which has completely automatic frequency tuning over the entire frequency range. The first chapter outlines the categories of instruments available to perform signal analysis and introduces the topic of T.H.D. Chapter 2 is a review of the essential theory necessary for an understanding of active filters, including the subject of network sensitivity. Chapters 3 to 6 deal with the circuitry used to attenuate the fundamental frequency component by the required amount. Chapter 3 is a comparison of the different types of frequency rejection or notch filters, and Chapters 4 and 5 discuss alternative methods of tuning the filter parameters and how automatic filter tuning may be obtained. Chapter 6 details how the remaining attenuation is achieved in a stage following the notch filter. The circuitry used to amplify the harmonic components to a suitable level for measurement and the display circuitry are discussed in Chapter 7, and Chapter 8 deals with amplitude and frequency range selection. The noise performance of the instrument is considered in Chapter 9, and in Chapter 10 the practical considerations and performance of the prototype instrument are given.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available