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

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

Example text

1. The permanent magnet system has over the years been considerably reduced in size due to the improvements in magnet design as better materials have become available. The coil may be air cored or mounted on a metal former; if the latter is present it will contribute to the damping of the instrument (eddy currents) but will add to the inertia of the movement. 1. Moving coil instrument scale length of the instrument can be increased from 1200 to 240 0 or even 3000 enabling a better resolution of reading to be obtained for the same measurement range.

In general these effects are made small by using short connections of suitable conductor. This problem is particularly relevant at high frequencies when considerable skill must be exercised to overcome their effects. (viii) Insertion errors Almost any insuument when connected into a circuit will change the conditions that existed in the circuit prior to its inclusion. It is therefore important to ensure that this disturbance is insignificant otherwise incorrect readings will be produced, that is, an error in addition to those inherent in the instrument will be added to the measurement.

Vii) Strays and residuals Among the possible effects of age is a build-up of deposits on surfaces. Such conditions can affect contact resistances, and surface leakage resistance. The first of these may be of consequence in the values of the lowest decade of a resistor box while the second is of importance between the terminals of an instrument with a high input resistance. While these forms of error may be monitored and allowed for by the calibration process, they may be reduced to negligible proportions by correct maintenance.

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