By W.J.M. Moore
ISBN-10: 0863411126
ISBN-13: 9780863411120
This publication provides the elemental concept of the present comparator, tools of development resulting in excessive ratio accuracies and the working ideas of some of the purposes
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Extra resources for The current comparator
Example text
This assembly is then enclosed in a copper box and the amplifier connected as shown. This toroidally shaped copper box contains the enhanced core. The primary and secondary ratio windings may now be installed and an error-free transformer will be obtained. The feedback amplifier will always supply such a a) b) no dc Fig. 19 (a) Peak detector circuit (b) Typical magnetising current waveforms, with and without DC in IP 48 Fig. 19 This magnetising current does not impose ampere-turns on the inner core because it passes through the same number of turns N in the opposite sense.
3 The voltage induced in a uniformly distributed winding on the toroid approximates a sinusoidal function of the dipole orientation /?. To explain these results, it must be noted that, first, the core is constructed from magnetic material of very high initial permeability (/x/^0 ^ 50 000) and, 20 Background and fundamental theory second, that core cross-section is small compared with the toroid diameter (inside diameter/outside diameter (ID/OD) ^ 0-9). From the first it follows that, regarding the magnetic field distribution outside the core, it may be concluded that the magnetic potential is almost the same everywhere in the close vicinity of the core.
Proc. IEE, part B, May 1961, pp. 339-43 20 O. Petersons. ' IEEE Trans. Instrumentation and Measurement, IM-15( 1-2), pp. March-June 1966, pp. 62-71 21 T. M. Souders. ' IEEE Trans. Instrumentation and Measurement, IM-21(4), November 1972, pp. 1 Introduction The design of a current comparator involves many judgments and compromises. Current level, frequency range, sensitivity, accuracy, availability of material, ease of manufacture, and cost are all factors to be considered. In this chapter the way in which the design of the various components of a comparator may be affected by these factors is examined.
The current comparator by W.J.M. Moore
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