Synopses & Reviews
The National Measurement Laboratories are the source of measurements standards and techniques for the scientific community and are dedicated to establishing and maintaining a consistent international system of units. This requires measurement standards and their dissemination with the lowest possible uncertainty to the scientific community and industry.
To accomplish this careful attention to detail is required in measurement systems designed to be as close to first principles as possible and attaining the best possible measurement resolution by eliminating disturbing influences such as extraneous electrical interference. the aim of this book is to offer guidance and best practice in electrical measurements applicable to any required accuracy level.
The book describes measurements and application of sensitive electrical circuits, with examples of the ultimate in noise-matching and interference elimination, in precise and accurate voltage, current and power measurements demonstrating the elegance, flexibility and utility of coaxial AC bridges. It also serves to up-date an earlier publication by one of the authors and includes more recent work on AC measurements of quantum Hall resistance to provide a primary quantum standard of impedance and the extension of coaxial networks to higher frequencies.
Synopsis
The book describes measurements and application of sensitive electrical circuits, with examples of the ultimate in noisematching and interference elimination, in precise and accurate voltage, current and power measurements demonstrating the elegance, flexibility and utility of coaxial AC bridges. It also serves to update an earlier publication by one of the authors and includes more recent work on AC measurements of quantum Hall resistance to provide a primary quantum standard of impedance and the extension of coaxial networks to higher frequencies.
Synopsis
The authors have between them more than 60 years of experience in making electrical measurements in National Measurement Laboratories. These laboratories are the source of measurement standards and techniques for science and engineering and are dedicated to maintaining the international system of units (SI) by establishing and disseminating the values of measurement standards with the lowest possible uncertainty. Careful attention to detail is required in designing measurement systems that eliminate electrical interference and are as simple and as close to first principles as possible. This book draws on their experience by offering guidance and best practice for designing sensitive electrical measurement circuits. In particular the book describes examples that demonstrate the elegance, flexibility and utility of balanced-current coaxial networks in obtaining the ultimate in noise-matching and interference elimination for precise and accurate voltage, current and power measurements. It also updates an earlier book on coaxial AC bridges by including recent AC measurements of quantum Hall resistance to establish a primary quantum standard of impedance and by extending impedance measurements in general to higher frequencies.
Table of Contents
The concept of a low-frequency coaxial network
Applications in sensitive and measurement circuitry
General principles of accurate impedance measurement
Impedance standards
Transformers
Sources, detectors, cables and connectors
Examples of bridges for impedance comparison
Bridges to measure the ratio of like impedances