| 摘要 |
Provided is an insulation resistance measuring apparatus capable of highly precisely measuring an insulation resistance characteristic of a capacitive electronic part in a short period of time while being unaffected by various kinds of noises. A predetermined measurement voltage is applied to a capacitive electronic part, and a current flowing through the electronic part is measured in order to calculate an insulation resistance characteristic of the electronic part. A noise clipper circuit having a resistor and a switch connected in parallel with each other is connected on a path leading from a measurement power supply through the capacitive electronic part to a current detector. The switch is controlled to remain closed in an early stage of charging the capacitive electronic part. When charging the capacitive electronic part has progressed sufficiently, the switch is controlled to open.
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