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
Inasmuch as bridges can occur in the Honeywell system, only if step-downs are assigned, our programs are designed to avoid this feature. While we have never been forced to make such assignments, we recognize the possibility that they could occur, and if they do, especially in large numbers, bridges are possible, but not foreordained. Therefore we have studied methods of detecting and eliminating bridges. These have not been programmed, since we have not found them necessary. However, one method, built about the principle of mapping the chassis, has been flow-charted and can be programmed if needed. A second method, resting on a mathematical analysis of the formulas of lines, can also be shown capable of detecting intersections of wires and, hence, possible bridges.
S. STRICKERSummary: Co-ordinate use of d-c analyzers and transductors increases the efficiency of analyzers. By using the symmetrical component technique, phase currents and voltages in the branches of the network under test can be indicated directly. This is done by using a combination of transductors as a summation instrument. Furthermore, it is possible to solve simple stability problems on the d-c analyzer by using the step-by-step method of calculation.By the addition of transductors to d-c network analyzers it is possible to improve their performance and their range of applications. Methods were developed that allow the solving of the following problems on a d-c analyzer.
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