Method of measuring insulation resistance of capacitor and insulation resistance measuring apparatus of the same

Abstract

An object of the present invention is to easily, quickly and precisely measure an insulation resistance of an capacitor. An insulation resistance measurement apparatus of the present invention includes a variable/constant-voltage power source, voltmeter, intermittent circuit and constant-current supply circuit, constant-current sink circuit, test capacitor, current amplifier, and A/D converter and calculation processor. The intermittent circuit and constant-current supply circuit intermittently output a current based on a voltage supplied from variable/constant-voltage power source. When a constant voltage is intermittently applied to the test capacitor, the current flowing through the test capacitor is amplified by the current amplifier, and subsequently inputted to the A/D converter and calculation processor. The A/D converter and calculation processor convert an analog current measured value to a digital measured value, subject the value to a calculation processing and intermittently output an insulation resistance value. Thereby, the insulation resistance can precisely be measured in a short time.

Dependencies are inferred from the claim text.