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By B.A. Gregory

ISBN-10: 0333293843

ISBN-13: 9780333293843

ISBN-10: 1349164828

ISBN-13: 9781349164820

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Extra info 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

5 except in the case of an ammeter, the meter resistance will need to be 1In of the circuit resistance. 5. 0001 Summation of Errors To establish the limit of uncertainty for a particular instrument all the above factors must be taken into account and a summation of the errors made. d. 5 per cent of full scale. 005 A. 19. Measurement of resistance using an ammeter and a voltmeter Thus it should be apparent that the more instruments involved in the performance of a measurement the greater the uncertainty that is likely to be in the value of the measured quantity and the totalising of construction/calibration errors is of considerable importance since, in most cases, these will account for the major part of the total error in a measurement.

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. By replacing the optical magnification system with a low drift, high gain differential input amplifier (see p.

C. signals will not pass through the transformer. 5 WAVEFORM Signals that alternate or vary with time in a simple regular manner, result from many natural situations: for example, vibration, sound, sea waves, etc. They are also encountered when measurements are to be made on many electrical or electronic systems, examples being power supply networks and communication systems. 30) where v is the instantaneous value of the voltage, Vm is the maximum value of the voltage, w is the frequency in radians per second and t is time in seconds.

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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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