Operating Manual | 5 Performing measurements
SONASCREEN
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Revision: 1.0 | 2022-03-04
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5.3.3
Setting the frequency filter
Description
Tests with large radiating surfaces may lead to low-frequency noise effects. The large color
areas of these noise fractions may overlap the areas of the high-frequency sound sources.
This may affect precise detection of high-frequency sound sources.
To limit the noise fractions displayed in the beam picture, a frequency filter may be used to
set or select frequency bands. The following filter modes may be set for this frequency
filter:
Filter mode
Description
Manual
Lower and upper cutoff frequency may be entered in the input fields
or set by moving the two left-side handles of the slider.
Moving the right-side handle of the slider will move the cutoff
frequencies simultaneously while keeping the relative difference
between lower and upper cutoff.
Octave
In the picklist, a particular frequency may be selected as mid-band
frequency. The frequency band will cover one octave around the
selected mid-band frequency.
The frequency band may be extended by selecting several
frequencies in the picklist. In that case, the frequency band will start
half an octave below the smallest selected frequency and end half an
octave above the largest selected frequency.
3rd Octave
In the picklist, a particular frequency may be selected as mid-band
frequency. The frequency band will cover the selected mid-band
frequency plus one-third octave above and below.
The frequency band may be extended by selecting several
frequencies in the picklist. Then, the frequency band will start one-
third octave below the smallest selected frequency and end one-third
octave above the largest selected frequency.
