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SVAN 971 User Manual
63
11 1/1 AND 1/3 OCTAVE ANALYSER
The instrument operates as a real time
1/1 Octave
or
1/3 Octave
analyser (RTA) in a very similar way
to the
Level Meter
. Moreover, 1/1 Octave or 1/3 Octave
analysis is performed in parallel with the Level
Meter measurements. All 1/1-octave (with 10 centre frequencies from 16 kHz down to 31.5 Hz; in base
two system) and 1/3-octave (with 31 centre frequencies from 20 kHz down to 20 Hz; in base two system)
digital pass-band filters are working in real-time with weighting filters (
Z
,
A
,
B
or
C
) selected in the
Spectrum
window (
path: Menu / Measurement / Spectrum / Filter
) and the linear LEQ detector. This
enables a spectrum pre-weighting with one of the selected broadband frequency curves if required for
the application such as the provision of hearing protectors during the control of high workplace noise
levels.
Note: TOTAL LEQ results are measured with their own weighting filters (A, C, Z) regardless
of settings made in profiles for Level Meter calculations. Spectra are always linearly averaged.
Thus, TOTAL values from 1/1 Octave or 1/3 Octave analysis can be different from those
obtained for profiles (if the LEQ Integration was set as Exponential).
For each octave or one-third octave band, the RMS, Min or Max result is
calculated and presented as a bar on the spectrum plot. Results of 1/1 Octave
and 1/3 Octave
analysis (spectra) can be examined by the user on a display in
the
Spectrum
presentation mode.
Besides results for bands three
Total
values are measured and displayed as an
additional three bars on the spectrum plot. Parameters for Total values (e.g.
filters) are set by default and cannot be changed.
The read-out of the spectrum value can be done using a vertical cursor.
11.1 S
ELECTION OF THE
1/1 O
CTAVE OR
1/3 O
CTAVE FUNCTION
To select the
1/1 Octave
or
1/3 Octave
analysis function,
open the
Meas. Funct
window, select the
1/1 Octave
or
1/3 Octave
position
and press
<Enter>
.
<ENT>
Note: The 1/1 Octave and 1/3 Octave functions are optional and should be unlocked by
entering the activation code in the text editor screen, which is opened after first attempt to
select them. Once unlocked these options will be ready to use permanently.
Note: It is not possible to change the current function during a running measurement.
In this case, the instrument displays for about 2 seconds the message:
“Measurement in
Progress”. To change the current function, the measurement must be stopped!
11.2 C
ONFIGURING THE
1/1
OR
1/3
OCTAVE ANALYSER
11.2.1 General measurement settings for the 1/1 and 1/3 octave analysis
–
General Settings
Execution of
1/1 Octave
or
1/3 Octave
analysis depends on certain set of parameters, configured in the
Measurement
section.
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