By B.A. Gregory

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Additional resources for An Introduction to Electrical Instrumentation and Measurement Systems: A guide to the use, selection, and limitations of electrical instruments and measurement systems

Example text

Of the United States and their equivalents in other countries have expended considerable effort in determining the absolute value of electrical quantities (see appendix I). That is to say quantities such as the ohm, the ampere and the farad have been determined in terms of the fundamental quantities of mass, length and time with the greatest possible precision although uncertainty still exists in their exact values, even if it is only a few parts in 1 000000000. K. volt = 1 Australian volt, and 36 AN INTRODUCTION TO ELECTRICAL INSTRUMENTATION so on, hence performance of equipment and measurement of physical phenomena are made on a common basis.

Trans. electronic Devices, 22 (1975) 642-9 11 BS 5233: 1975 Glossary of terms used in metrology 12 A. Simpson, Testing Methods and Reliability, Electronics (Macmillan, London and Basingstoke, 1976) 13 BS 89: Part 1: 1970 Single purpose direct acting electrical indicating instruments and their accessories 14 British Calibration Service, General Criteria for Laboratory Approval (London, 1967) 2 Analogue Instruments An analogue device is one in which the operation and output are continuously variable and bear a fIxed relationship to the input.

Of greatest importance is its actual or true value. It must be realised that it is impossible to determine exactly the true value of any quantity: the value assigned to a quantity will always have a tolerance or uncertainty associated with it. In some instances this tolerance is very small, say 1 part in 10 9 , and the true value is approached but it can never be determined exactly. Nominal value The nominal value, usually of a component, is the one given it by a manufacturer, for example, a 10 kil resistor.

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