15
4 Measuring
Each filter level accentuates certain specific noise elements.
Suitability of filter levels
Filter
level
Frequen-
cy
Noise
Select for
1
low
muffled
z
Large pipe diameters
z
Plastic piping
z
Floors
.
.
.
.
.
.
z
Small pipe diameters
z
Metal pipes
8
high
clear
The filter levels also allow frequency ranges of different widths
to pass.
Width of frequency range in the individual filter levels
Filter
level
Low
<
Frequency
>
High
1
2
3
4
5
6
7
8
Note:
The filter level influences the device's internal cal-
culation of the minimum sound level. It is therefore
important only to compare measurement values that
have been calculated at the same filter level.
