Get An Introduction to Electrical Instrumentation and PDF

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

In practice, there are limitations to this principle. 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.

If two, or more, inductors have to be used in a circuit they should be arranged for minimum coupling, that is their axes should be arranged at 90° to each other. 7 SELECTION This introductory chapter began by posing a number of questions relating to the selection process that can be adopted to ensure the performance of a measurement in a satisfactory manner. Although the preceding pages cannot have answered these questions completely, hopefully they will have made the reader pause and wonder whether, in the past, he has always made measurements with sufficient forethought.

Scheme [14] are for the temperature to be maintained at 2QoC ± 2°C (or 23°C ± 2°C) and the relative humidity to be between the limits of 35 per cent and 70 per cent. The effects of variations in atmospheric pressure on the performance of electrical instruments are in general small, except in the measurement 'of high voltages by sphere-gap breakdown where they are of extreme importance and must be allowed for. However, the facility to measure atmospheric pressure in a calibration room for eleCtrical instruments should not be overlooked as it may constitute an undetected systematic error in a particular measurement.

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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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