Patent ID: 8878547

Claim:
A method of monitoring insulation resistance between a high-voltage power net and a low-voltage power net, the high-voltage power net and the low-voltage power net being included within a vehicle, the low-voltage power net being grounded to a first ground and the high-voltage power net being grounded to a second ground, the second ground floating relative to the first ground, the method comprising: generating a test signal in a digital format; converting the test signal in the digital format into an analog test signal; applying the analog test signal to the high-voltage power net; converting the analog test signal applied to the high-voltage power net into a digital reference signal; measuring an output frequency response of the high-voltage power net to the analog test signal applied to the high-voltage power net while the high-voltage power net is active; and comparing the output frequency response to a frequency domain representation of the digital reference signal to determine whether a desired insulation resistance is provided between the high-voltage power net and the low-voltage power net.