Method of measuring insulation resistance of capacitor and insulation resistance measuring apparatus of the same
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United States of America Patent
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Nov 4, 2003
Issued Date -
N/A
app pub date -
Oct 31, 2001
filing date -
Jul 25, 2001
priority date (Note) -
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status (Latency Note)
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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.
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