B&K 2250 Light Manual do Utilizador descarregar pdf (Página 179)

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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 L

Aeq

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.)

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B&K 2250 Light Manual do Utilizador Página 179