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Download e-book for iPad: An Introduction to Electrical Instrumentation and by B.A. Gregory

By B.A. Gregory

ISBN-10: 0333293843

ISBN-13: 9780333293843

ISBN-10: 1349164828

ISBN-13: 9781349164820

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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

Sample text

Commercial liquid-crystal displays are normally limited to arrays of a few numerals, for their slow operating speed and threshold problems make them apparently unsuitable for use in larger arrays. ). Gas-discharge display devices utilise the light output of a cold-cathode discharge emanating from the excitation of gas atoms under electron bombardment. Thus a characteristic of the glow discharge is the bright glowing sheath, the socalled negative glow, that faithfully surrounds the cathode. This property was utilised in the original cold cathode numerical indicator 'Nixie' tubes, in which thin numeral (0 to 9) shaped cathodes were stacked one behind the other and surrounded by an anode structure the front of which was in the form of a gauze with good optical transmission.

2S (1979) 20-4 8 E. Huggins, Microprocessors and Microcomputers, their use and programming (Macmillan, London and Basingstoke, 1979) 9 G. F. , 12S (1978) 10 J. c. E. 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.

6. Limits of intrinsic error of instruments expressed as a percentage of the fiducial value (extracted from BS 89: Part 1: 1970). OS error per cent per cent per cent per cent per cent per cent per cent per cent per cent Digital instruments The accuracy specifications of digital instruments are normally written independently by the manufacturers of each instrument. The accepted method of presenting the specification is in two parts, namely (a) a percentage of the input (or reading); and (b) a resolution error equated to a number of digits in the least significant decade.

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An Introduction to Electrical Instrumentation and Measurement Systems: A guide to the use, selection, and limitations of electrical instruments and measurement systems by B.A. Gregory


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