G - Physics – 01 – R
Patent
G - Physics
01
R
G01R 27/16 (2006.01) G01R 27/08 (2006.01) G01R 27/20 (2006.01) G01R 31/04 (2006.01) G01R 31/42 (2006.01)
Patent
CA 2141390
The invention relates to a method for measuring a resistance value in a network incorporated in an electri- cal apparatus, wherein the network has at least two accessible terminals, the network has at least two time constants differing mutually by at least one order of magnitude, and the resistance value can be related to the voltage applied to the terminal clips and the current flowing through the apparatus. Such control switches are poorly accessible. Direct measurement is time-consuming as a result of the large value of the time constants. These problems are diminished by applying a step-like change of the voltage to the terminal clips, measuring the current flowing through the terminal clips before the change has taken place and after the transient phenomenon related to the smallest time constant and caused by applying the change is damped, and calculating the first resistance value from the measured values of the current.
Fetherstonhaugh & Co.
N.v. Kema
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