From this, these three simultaneous equations express the requirements at three temperatures 0.5SR sa +0.97R SO +0.99Rsc = 1.0 0.04i? sa -fO.60£ sb +0.92£ sc = 0.5 0.16i? sö +0.60£ sc =0.2 Therefore R sa =0.569, R^a =0.4X0.569 =0.228 R sb =0.481, JR 25& = 10X0.481=4.81 R sc =0.205, i?25C= 85X0.205 = 17.4The results of the calculated network fit the required nonlinear curve so well that, if plotted in Fig. 13, the two curves could not be readily distinguished from one another. The calculated maximum error is 2 C.This technique may not be usable in all nonlinear cases because of slope limitations. Frequently, a series resistance may be required to trim the network to the desired resistance value.Persons requiring circuitry for nonlinear temperature-sensitive systems and components, such as synchros, resolvers, tachometers, etc., should find the application interesting. Use of shunts, which have positive temperature coefficients, extends the possibilities of application, since re-versals, and both positive and negative slopes, are then realizable.The authors have used these techniques in the compensation of precision and semiprecision tachometers. A paper covering more advanced and varied nonlinear techniques and applications, such as multiscaled temperature-sensitive instrumentation, is being considered by the authors.
Reference
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