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8 Menu
8.4.3.3 Filter basis
Here you can change the mode of curve of the frequency curve
for the
filter settings.
Coherence
The similarity of the frequencies is displayed.
Cross spectrum
The cross spectrum from the two channels is displayed.
Spectrum, Ka 1
The frequency spectrum of channel 1 is displayed.
Spectrum, Ka 2
The frequency spectrum of channel 2 is displayed.
8.4.3.4 Filtering method
Under “square” the signal is filtered exactly at the marked posi
-
tion.
Under “Hanning” a “soft transition” is created around the marked
position.
8.5
Measuring method
The “measuring method” function allows you to switch between
the standard measurement (= correlation measurement) and the
sound velocity measurement (see section 6).
8.6
Measuring parameters
The “measuring parameters” submenus allow you to set various
parameters which affect the measurement.
8.6.1
Noise suppression
“Noise suppression” is a function to reduce the negative impact
of temporary interference noise (vehicles, pedestrians).
With “noise suppression” it is assumed that optimal results can
be achieved at moments when the noise (signal) measured is
relatively small. This is when the permanent leak noise is by and
large free from interference.
