10 1/1-OCTAVE AND 1/3-OCTAVE ANALYSER
The instrument operates as the 1/1-octave or 1/3-octave analyser 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 10/15 centre frequencies from 16 kHz down to 31.5 Hz/1.0 Hz; in base two system for
Sound/Vibration measurements) and 1/3-octave (with 31/45 centre frequencies from 20 kHz down to
20 Hz/0,8 Hz; in base two system for Sound/Vibration measurements) digital pass-band filters are working in
real-time with the weighting filters (Z, A, B or C - for sound measurements; HP or HPE- for vibration
measurements) and the RMS/LEQ detector (Linear, Fast or Slow - for sound measurements; Linear - for
vibration measurements). 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.
Note: TOTAL RMS (LEQ) results are measured with their own weighting filters (A, C and Z - for sound
measurements; HP, HP3 and HP10 – for vibration measurements) regardless of settings made in
profiles for the Level Meter measurements. Spectra are always linearly averaged. Thus, the Total
values for 1/1 Octave or 1/3 Octave analysis can be different from those obtained for profiles (if
RMS 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.
Spectra can be examined on a display in the
Spectrum view.
The read-out of spectrum values can be done
using a vertical cursor.
Besides results for bands three Total values
are measured and displayed as additional
three bars on the spectrum plot. Parameters
for Total values (e.g. filters) are set by default
and cannot be changed.
10.1 SELECTING THE 1/1 OCTAVE OR 1/3 OCTAVE FUNCTION
To select the 1/1-octave or 1/3-octave
analysis function, open the
Measurement Function screen, select the
1/1 Octave or 1/3 Octave position and press
<ENTER>.
Note: The 1/3 Octave function is optional and should be unlocked by entering an activation code in
the text editor screen, which is opened after first attempt to select this option. Once unlocked this
option 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!
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