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
Vibration Galvanometer The construction of a vibration galvanometer  is slightly different from the steady state galvanometer in that there is no iron core, the coil is very narrow and the control constant is large. c. c. circuit. c. circuit will have little or no response to harmonics in the electrical signal. Vibration galvanometers may be constructed to have resonant frequencies up to 1 kHz, but are now normally only used at power-line frequencies. Electronic Galvanometer The practical limitations on the sensitive light spot galvano,meter are its susceptibility to vibration, it is relatively fragile (even allowing for the improvements in robustness obtained using taut band suspension), and the slow response exhibited as balance is approached.
In deriving such expressions simplifications and approximations are often made. 3) which is Rx =~ + [m+:r+q (~ - ;)] In practice this equation is usually approximated to Rx = QS/M which is very much easier to handle but provides an answer that has an error due to neglecting the result of the terms in the outer brackets. (iv) Calculation error The effects of this form of error are likely in most cases to be negligible if sufficient calculating power is used, for example, an 8 or 10-digit calculator generally makes this form of error insignificant in comparison with other errors.
Kent tech. , 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.