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Chapter 15
Tone Assessment Option BZ-7231 –
1/3-octave Method
15.1
General
Tone Assessment Option BZ-7231 includes tone assessment according to selected methods.
The software module includes an ‘FFT based’ as well as a ‘1/3-octave based’ method. It allows
assessment of tones on-site.
The result of the tone assessment is the adjustment to be added to the LAeq as described in the
relevant standards for calculating rating level.
BZ-7231, when used with Frequency Analysis Software BZ-7223, Logging Software BZ-7224,
and Enhanced Logging Software BZ-7225, allows you to:
•
Assess tones in a measured 1/3-octave spectrum according to ISO 1996:2007, Annex D
•
Assess tones in a measured 1/3-octave spectrum according to Italian Law, “Ministero
dell’ambiente, Decreto 16 marzo 1998”, hereafter referred to as “Italian Law”
BZ-7231, when used with FFT Analysis Software BZ-7230, allows you to:
•
Assess tones in a measured FFT spectrum according to ISO 1996:2007, Annex C
•
Use the “Generate tone at cursor” feature to generate a pure tone on the headphone output
of the Hand-held Analyzer, for comparison to the actual noise
This section will focus on tone assessment based on the 1/3-octave method. Please refer to
User Manual BE 1778: “FFT Analysis Software BZ-7230 and Tone Assessment Option
BZ-7231, for use with Hand-held Analyzers Types 2270 and 2250” for detailed information
about tone assessment based on FFT spectra.
Tone Assessment Option BZ-7231 brings results to the user on-site as well as preparing for
post-processing and reporting back at the office. Documentation can be completed using
Measurement Partner Suite BZ-5503, or the measured data can be exported for post-processing
by Evaluator Type 7820 or other post-processing software such as Microsoft® Excel®.
Check the About screen to see whether you have a license to run the Tone Assessment option.
(To access the About screen, tap the Help icon
then tap About.)