Patent ID: 11946959
Assignee: MTD PRODUCTS INC
Field: Control (Instruments)
Classification: CPC G  A | IPC G

Claim 11:
12. The demarcating system according to claim 1, wherein each of the series of test voltage waveforms has substantially a same shape, but a different respective frequency, the frequencies of the series of test voltage waveforms being distributed over a frequency range;
wherein analyzing the series of corresponding current waveforms comprises determining a resonant frequency, f0 within the frequency range;
wherein the resonant frequency is such that a voltage waveform of substantially the same shape as the test waveforms and having the resonant frequency will generate a corresponding current waveform having a maximum amplitude as compared with current waveforms that are generated by voltage waveforms of the same shape as the test waveforms and have other frequencies within the frequency range.