Parker EME
Setting up Compax3
192-120114 N5 C3I22T11 June 2008 255
4.3.9.5 Measurement of frequency spectra
In this chapter you can read about:
Functionality of the measurement.................................................................................... 255
Leak effect and windowing .............................................................................................. 256
Please note that you require a licence hey (see page 250, see page 248) 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
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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, inde-
pendently of the scanning frequency (fA) and of the number of measurement va-
lues used (N).
The spectra of scanned signals are only defined for frequencies, which are an inte-
ger multiple of this frequency resolution.
Interpretation of the frequency spectrum
±100mA
20ms Æ 50Hz
50mA/Div
Frequency Spectrum comulative
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