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By B.A. Gregory

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Extra 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

It must be accompanied by a statement of the uncertainty or the possible limit of error associated with the measurement. Tolerance and uncertainty From the above definitions the accuracy of a measurement must be quoted as a tolerance or uncertainty in measurement. 7 S1. 2 S1 were obtained, a narrowing of the band within which the true value must lie is possible. 7 S1. 17. zn - ---,--------i 1 1 1..... 17. Band diagram for quoted resistance measurement n the value of the resistor must be given to one-hundredth of an ohm otherwise ambiguities arise.

Such conditions can affect contact resistances, and surface leakage resistance. The first of these may be of consequence in the values of the lowest decade of a resistor box while the second is of importance between the terminals of an instrument with a high input resistance. While these forms of error may be monitored and allowed for by the calibration process, they may be reduced to negligible proportions by correct maintenance. Of a more random nature are the effects of the impedance (resistance, inductance and capacitance) of the connections between a measurand and an instrument.

Baldwin, Fundamentals of Electrical Measurements (Harrap, London, 1961) 2 S. Stein and J. Jay Jones,Modern Communication Principles (McGraw-Hill, New York, 1967) 3 E. C. Bell and R. W. Whitehead, Basic Electrical Engineering and Instrumentation (Crosby Lockwood Staples, London, 1977) 4 N. M. Morris, Digital Electronic Circuits and Systems (Macmillan, London and Basingstoke, 1974) 52 AN INTRODUCTION TO ELECTRICAL INSTRUMENTATION 5 D. Moralee, Floppy discs, the storage medium for microprocessor systems, Electronics Power, 24 (1978) 637-41 6 K.

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