G01R23/177 - CPC Classification Index

ClassID:

171578 ⎘

G01R23/177 - CPC Classification

Classification description:

Arrangements for measuring frequencies; Arrangements for analysing frequency spectra; Spectrum analysis; Fourier analysis Analysis of very low frequencies

Recent Application in this class:

20210341523

2021-11-04

Wind turbine and method for detecting low-frequency oscillations in an electrical supply grid

20210208186

2021-07-08

Wind turbine and method for detecting low-frequency oscillations in an electrical supply grid

20200149939

2020-05-14

Method for evaluating a frequency spectrum

20190310293

2019-10-10

Method for Detecting Normal Harmonics of Earths Electromagnetic Atmospheric Resonant Frequency First Harmonic of 15.3 Hz and Abnormal Frequencies Corresponding to Neurological Diseases

20190187195

2019-06-20

Signal processing method and material testing machine