Use of Filters for Octave Band Analysis
1 Turn on the meter by selecting ‘A’ weighting or LIN
response and switch the filters to MAN.
2 Check the battery voltage and calibration of the sound
level meter.
3 Select the lowest filter frequency (31.5Hz) and the
100dB range.
4 Point the instrument towards the source of the sound to
be measured.
5 Progressively step down the ranges until a reading in
the upper two thirds of the meter scale is obtained.
6 Record the reading and select the next centre frequency.
Repeat the measuring procedure until the highest filter
frequency (16kHz) is reached.
It is possible to switch the filter OUT and back to MAN
again and still maintain the last selected centre
frequency.
7 With the results obtained an octave band plot can be
drawn. This plot gives the spectrum of the noise source
being measured, from which the nature and cause of the
noise can be determined and cured.
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Summary of Contents for GA112
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