Electricity: measuring and testing – Magnetic – With compensation for test variable
Patent
1983-06-20
1985-11-12
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With compensation for test variable
324233, 324243, G01R 3312, G01N 2772
Patent
active
045530947
ABSTRACT:
Method and apparatus for measuring conductivity of test materials at a measurement temperature and displaying material conductivity at standard temperature by compensating the measured conductivity for conductivity changes due to the measurement-standard temperature differential. This is accomplished by developing a first periodic signal having a period which varies as a direct linear function of material conductivity C.sub.T at the measurement temperature, and a second periodic signal having a period which varies as a function of the product of measured conductivity C.sub.T, the measurement/standard temperature differential .DELTA.T and a conductivity constant .beta. characteristic of non-ferrous metals having a given base metal. Standard conductivity C.sub.S is then determined in accordance with the equation C.sub.S =C.sub.T (1 +.beta.C.sub.T .DELTA.T) as a combined function of the periods of the first and second signals, and is displayed in percent IACS at 20.degree. C.
REFERENCES:
patent: 3525931 (1970-08-01), Aisenberg
patent: 3651398 (1972-03-01), Urmenyl
patent: 4095180 (1978-06-01), Brown
K. J. Law Engineers, Inc.
Strecker Gerard R.
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