5
Sound Level Meter Software for Type2250-L – BZ-7130
SLM Module
Fig. 2
The large numeric
display – ideal for a
spot noise
enforcement check
Type2250-L comes with Sound Level Meter Software for Type 2250-L
included. Type2250-L is a versatile broadband sound level meter that
complies with the latest international standard (IEC 61672–1) as well
as previous international and national standards.
All quantities are measured simultaneously. For example, A and C
frequency weighted levels are measured at the same time and F, S and I
time weightings are applied in parallel, and Peak levels are also
measured. Full statistics are also computed on-the-fly.
Combine t h i s
with the dynamic range exceeding 120 dB and never miss a beat!
You get all the parameters in one attempt, under- range is non-existent
and you will have difficulties provoking an overload.
A full compliment of
occupational health sound parameters are provided simultaneously,
complying with national and international standards. The detailed list of
available parameters can be found in the specifications section. You
choose what you want on the display, but, at any time – during or after
the measurement – all other parameters can be inspected and reported.
1/1- and 1/3-octave Frequency Analysis Software for Type2250-L – BZ-7131 and BZ-7132
Fig. 3
Example of 1/1-octave
frequency analysis.
Note that two spectra
are displayed
simultaneously
1/1-octave Frequency Analysis Software for Type2250-L BZ-7131, and
1/3-octave Frequency Analysis Software for Type 2250-L BZ-7132 are
optional software modules that enable real-time measurements in 1/1- or
1/3-octave bands over a wide frequency range.
This makes it a simple
matter to obtain spectra in order to, for example,
select hearing protection,
qualify heat and ventilation systems, or assess tonality.
The following frequency ranges are available:
•1/1-octave spectra (centre frequencies 16 Hz to 8 kHz)
•1/3-octave spectra (centre frequencies 12.5 Hz to 16 kHz)
Each band provides unrivalled dynamic range from the noise floor in that
particular band to 140 dB. That is, a dynamic range generally in excess
of 135 dB. Spectra can be A-, B-, C- or Z-weighted. Five spectra are
measured and stored and, in addition, two instantaneous spectra are
available for display, for example, a minimum and maximum spectrum,
t h a t can be superimposed on the display. All the broadband
quantities measured by Sound Level Meter Software BZ-7130 are
computed in parallel with the frequency analysis.
Tone Assessment – BZ-7231
Fig. 4
Tone Assessment
BZ-7231 shoeing
1/3-octave bands with
audible tones over a
set limit (identified by
the blue dots)
Tone Assessment (optional application) identifies any 1/3-octave bands
with audible tones above a set limit. The assessment is based on the
band’s prominence versus adjacent bands. The adjustment is the penalty
to add to L
Aeq
.
Annoying tones in the spectrum may be assessed according to the
ISO 1996 standard. The level of each 1/3-octave band is compared to
the level of its neighbours, and all tones as well as the overall penalty
(adjustment) are indicated. The search parameters are user adjustable to
suit national requirements.
(16 Seiten)
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