Svantek SV 971A, Руководство пользователя

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SV 971A User Manual
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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
◄
/
►
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.
<ENT>
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.