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SECTION III OPERATION MANUAL
Utrecht
- 43 - Ref 002
6. SPECTRUM
6.1. Harmonic Analysis
This function displays the results of Fast Fourier Transformation (FFT) calculations in
numeric and graphic mode.
Graphs are auto scaled in order to ensure maximum resolution.
The top line provides information on the selected input (U1, I1, U2, I2, U3, I3), its absolute
value and the synchronization frequency.
The bottom line provides details of the selected harmonic component and its absolute and
percentage values. The equivalent bar graph is identified by a flashing cursor.
Fig. 15: Harmonic Analysis
Use LEFT and RIGHT keys to select the required bargraph, and the SELECT key to
choose the required input signal (U1, I1, U2, I2, U3, I3).
6.2. Mains Signaling and Interharmonic Analysis
If a signal decomposition with Fourier transformation results with presence of a frequency that is
not integer multiple of fundamental, this frequency is called interharmonic frequency and
component with such frequency is called interharmonic.
35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110
Hz
harmonicfundamental 2
nd
harmonic
group
interharmonic
group
harmonic
group
Fig. 15a: Detail of interharmonics spectra
44


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