Svantek SVAN 106, Руководство пользователя

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SVAN 106 User MANUAL
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10. 1/1 AND 1/3 OCTAVE ANALYSER
The instrument operates as 1/1 Octave or 1/3 Octave analyser in a very similar way to the Level Meter
mode and, in addition, 1/1-octave or 1/3-octave analysis is performed in parallel with the Level Meter
operations. All 1/1-octave (with the centre frequencies from 2 kHz down to 0,5 Hz; in base two system) and
1/3-octave (with the centre frequencies from 2,50 kHz down to 0.40 Hz; in base two system) digital pass-
band filters work in the real-time with the HP weighting filter (type 1 according to the IEC 61672-1 standard;
the filter characteristics are given in Appendix D) and the linear RMS detector.
The results of 1/1 Octave and 1/3 Octave
analysis (also called spectrum analysis)
can be examined by the user on a display
in the Spectrum presentation mode. The
availability of this mode can be switched on
or off by the user (path: <Menu> / Display /
Display Modes ).
..
1/1 Octave and 1/3 Octave spectrum for all centre frequencies of pass-band filters together with three
Total Values measured with selected by the user weighting filters are presented in the switched on
Spectrum mode.
10.1. Selection of 1/1 Octave or 1/3 Octave analysis mode
In order to select the 1/1 Octave or
1/3 Octave analysis mode the user has to
enter the Function list by pressing the
<Menu> push-button, then - select the
Function text and press the <ENTER>
one.
<ENT>
Notice: It is not possible to change the current function during the measurements.
The instrument displays in this case for about 2 seconds the text: ”Measurement in
Progress”. In order to change the current measurement function the instrument must be
stopped!
10.2. Setting the parameters of 1/1 Octave and 1/3 Octave analysis -
The execution of 1/1 Octave or 1/3 Octave analysis depends on settings of the General Settings list:
Measure Period and Repetition No.. Other parameters are setting up by default: weighing filter (HP),
frequency range (from 0,5 Hz up to 2 kHz for 1/1-octave analysis and from 0.40 Hz up to 2,50 kHz for 1/3-
octave analysis) and measurement range (126 m/s
2
). In every 1/1 octave or 1/3 octave bandpass the RMS
result is measured.