Parker EME
Setting up Compax3
192-120101 N11 C3I11T11 November 2007
201
4.4.9.5
Measurement of frequency spectra
In this chapter you can read about:
Functionality of the measurement....................................................................................................201
Leak effect and windowing ..............................................................................................................202
Please note that you require a
licence hey
(see page 196, see page 194) for
this application!
Functionality of the measurement
Measurement of the spectral analysis
System S
2
Signal u(t)
Controller & Signal Pocessing
Steuerung & Signal-
Verarbeitung
Amplitude spectrum
Amplitudenspektrum
V(f)
C3-Software-
Oscilloscope
Upload
System S
1
During the spectral analysis of scanned signals with the aid of the discrete Fourier
transformation, a so-called frequency resolution (Df) results, Df being =fA/N,
independently of the scanning frequency (fA) and of the number of measurement
values used (N).
The spectra of scanned signals are only defined for frequencies, which are an
integer multiple of this frequency resolution.
Interpretation of the frequency spectrum
±
100mA
20ms
50Hz
50mA/Div
Frequency Spectrum comulative
