10.2.2 Selecting measurement range for 1/1- and 1/3-octave analysis – Range
For the 1/1 Octave or 1/3 Octave functions you can
select the input ranges specified in Appendix C, named
as Normal and Low.
The selection of the input range is made in the Range
screen of the Measurement list.
For the 1/1.&Dose or 1/3.&Dose functions the input range is set to Normal and
you cannot change it.
Note: The ranges at the above screens correspond to the microphone with the sensitivity
within the declared range 25 ÷ 37 mV/Pa (see Appendix C). If microphone sensitivity is other
than 25 ÷ 37 mV/Pa, the range will be automatically changed.
10.2.3 Logging of 1/1- and 1/3-octave spectra – Logging
Spectra are always logged together with the Summary results in a logger file with
the Integration Period step. The first condition should be fulfilled, namely the
Logger must be switched on (path: <Menu> / Measurement / Logging /
Logger Setup / Logger: On).
The Leq and Lpeak results from the 1/1-octave or 1/3-octave analysis can also
be logged in the logger file with the step defined by the Logger Step parameter
(path: <Menu> / Measurement / Logging / Logger Setup). To enable spectrum
saving in the logger file, check the Peak Spectrum or Leq Spectrum position in
the Logger Results list (path: <Menu> / Measurement / Logging / Logger Res.)
with the â—„ / â–º key.
10.2.4 Setting parameters of 1/1- and 1/3-octave analysis – Spectrum
For the 1/1-octave or 1/3-octave analysis functions, the
additional position (Spectrum) appears in the
Measurement list.
The Spectrum position enables selecting the pre-
weighting broadband frequency filter and the LEQ
detector for the octave or third octave analysis.
Following weighting filters are available for the 1/1 and 1/3-octave analysis:
• A according to IEC 651 and IEC 61672-1:2013 for Class 1,
• C according to IEC 651 and IEC 61672-1:2013 for Class 1,
• Z according to IEC 61672-1:2013 for Class 1,
• B according to IEC 651 for Class 1.
Filter characteristics are given in Appendix C.
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