MONITORING INSTRUMENT FOR DC RESISTANCE OF ELECTRIC CIRCUIT

摘要

PURPOSE:To forecast the progressive state of secular deterioration in respective parts of an electric circuit by detecting a consumption degree of tools and a wiring in the electric circuit from an increment degree of a resistance value of the electric circuit. CONSTITUTION:A first resistance 1 wherein the resistance value is k.R and a second resistance 2 wherein the resistance value is r1 are connected in series with a circuit being a monitor object wherein a DC reference resistance is R, a DC voltage (v) is impressed on these DC circuits. Next, an abnormality deciding circuit 3 is connected with the first and the second resistance series circuits 1, 2, and when the voltage (v) of both terminals is below a deciding level, the abnormality of the circuit being a monitor object is decided.