| 摘要 |
PROBLEM TO BE SOLVED: To accurately measure insulating resistance of electronic part by dividing the measurement data of the leakage current into plural segments and eliminating a noise component on the basis of the approximation by the least squares method within each segment. SOLUTION: A direct current applying source 1 is connected to a measuring terminal 4a through a switch 2 and a current limiting resistor 3. The measuring terminals 4a, 4b can contact with an electrode of a capacitor 5 to be measured. The leak current of the capacitor 5 is sent from the measuring terminal 4b to a current detecting circuit 6 such as an OP amplifier, and detected by conversion to voltage. Output of the current detecting circuit 6 is sent to an analyzing device (CPU) 8 through an A/D converter 7. The current limiting resistor 3 increases a resistance value of the circuit when capacity of the capacitor 5 is large and the excessive current flows so as to limit the initial current at an allowable level or less. As a CPU 8, a high frequency analyzing device having a sampling frequency at about several 10μs is used, and the leakage current is accurately detected on the basis of the approximation by the least squares method.
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