Patent ID: 11899050
Assignee: WOBBEN PROPERTIES GMBH
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H  Y | IPC G  H

Claim 4:
5. The method as claimed in claim 1, comprising:
repeating multiplying each measurement point of the at least one series of measurements by the test function and summing the plurality of products while varying the test frequency in a first test loop, wherein:
the test frequency is varied within a first frequency range in the first test loop to detect the low-frequency oscillation having the oscillation frequency, and
the oscillation frequency is detected with a first accuracy; and

repeating multiplying each measurement point of the at least one series of measurements by the test function and adding the plurality of products while varying the test frequency in a second test loop, wherein:
the test frequency is varied within a second frequency range in the second test loop; and
the second frequency range is selected depending on the oscillation frequency detected in the first test loop to detect the oscillation frequency with a higher accuracy than in the first test loop.