An Introduction to Electrical Instrumentation and by B.A. Gregory

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By B.A. Gregory

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Additional info 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

A more precise method of evaluating the randomness of a set of observations is to calculate the standard deviation for the distribution. Since the sum of the deviations for all the points in a distribution will be zero, the standard deviation for a set of observations is obtained by calculating the square root of the mean of the sum of the squared deviations that is a = [ (x ; x)~] t x where is the mean value, x is an individual value, and N is the number of values. 2 per cent. 6745a. 20 the curve A would have a a of 1 while for curve B a = 3.

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.

2) in which there are no bearings and where the control torque is derived from the twisting of the suspension ribbon. This latter method is claimed to be advantageous as it eliminates bearing friction. 2. 'Long scale' moving coil instrument Except in some inexpensive instruments, the pointer is normally of a lightweight construction being in the form of a fine blade. 1). The weight of the pointer is normally counterbalanced by weights situated diametrically opposite its centre of mass. To damp the movement a combination of electrical eddy current effects, the passage of the movement plus vanes through the surrounding air, and friction in the bearings is used.

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