14
4 Measuring
4.3
How to influence the quality of the measurement result
Various factors can affect the quality of a measurement.
z
If possible only measure when the amount and intensity of
in-
terference noise
(e. g. open water pipes, vibrating machines,
talking) is
minimal
.
z
Check and see if
selecting another filter level
delivers a
clearer result (see Section 4.3.1).
z
Hold the device
still during the measurement. Otherwise the
measurement values will be distorted.
If necessary use an
external microphone
which does not have
to be held steady (see Section 4.3.2) or
extend
the
probe tip
to allow easier access to the object of examination (see Sec-
tion 4.3.3).
z
Never measure just once.
Firstly familiarise yourself with the acoustic environment by
conducting several
test measurements
.
Repeat the actual measurement at various points around a
suspected leak to obtain an informative
series of measure-
ments
.
4.3.1
Changing the filter level
The device can be operated with eight different filter levels. The
selected filter level affects individual perception of the noise.
Note:
The filter level cannot be changed if the filter key is
locked (see Section 5.2).
