Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1978-08-04
1981-04-28
Karlsen, Ernest F.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
324 64, 324118, G01R 2702, G01R 2714
Patent
active
042648602
ABSTRACT:
Apparatus for measuring a resistor in function of the amplitude of a direct current or the frequency and the amplitude of an alternating current. When the direct current equipment of this apparatus is used, the direct current signal flowing through the resistor is generated from an adjustable direct current generator and produces between terminals of the resistor a direct voltage signal which is chopped and amplified into a recurrent rectangular signal having a predetermined frequency and an amplitude proportional to the resistance value of resistor and included within a predetermined measurement interval. When the alternating current equipment of this apparatus is used, a first alternating current signal flowing through the resistor is generated from an adjustable frequency generator, an adjustable amplitude attenuator and a voltage-to-current converter. The first alternating current signal produces between terminals of the resistor an alternating voltage signal which is amplified and tuned in dependence upon the selected amplitude and frequency and also one of resistance value measurement ranges so as to produce a second alternating voltage signal having an amplitude proportional to the resistance value of resistor and included within the measurement interval. The recurrent voltage signal or the second alternating voltage signal rectified and filtered is transmitted to a display device including the measurement interval which is independent of the selected amplitudes, frequency and measurement range, for indicating the resistance value of the resistor as a function of the selected parameters of the respective current signal.
REFERENCES:
patent: 2297543 (1942-09-01), Eberhardt et al.
patent: 2871446 (1959-01-01), Wann
Moerschell et al., "Spreading Resistance Probe", IBM Tech. Dis. Bull., vol. 13, No. 11, Apr. 1971, p. 3365.
Allen et al., "An AC Silicon Resistivity Meter", Rev. of Sci. Instruments, vol. 32, No. 7, Jul. 1961, pp. 824-828.
Moffitt, L. R., "A Versatile . . . ", Conference: Proc. of the 9th Annual Rocky Mountain Bioengineering Symposium and the 10th Int. ISA Biomed. Sci. Instrum. Sym., vol. 9, Omaha, Neb., 1-3 May 1972, pp. 15-20.
Karlsen Ernest F.
Saffitz Abraham A.
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