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109

Chapter 10

1/1- or 1/3-octave Frequency Analysis

(Optional Module)

Frequency Analysis Software BZ-7223 enables you to make 1/1-octave or 1/3-octave

measurements and broadband sound level measurements simultaneously.

Check the About screen to see whether you have the license to run the Frequency Analyzer. (To

access the About screen, tap the Help icon then tap About.) See Chapter 9 for instructions

on installing the license for the Frequency Analyzer.

10.1 Setting up the Analyzer

The Frequency Analyzer measures the following spectrum parameters together with full

spectral statistics during timed measurements:

•L

Xeq

•L

XFmax

•L

XSmax

•L

XFmin

•L

XSmin

where X is the frequency weighting A, B, C or Z.

These spectra and the spectral statistics are saved in the project together with the measured

sound level meter (broadband) parameters.

The spectral statistics can be viewed as L

XYN

percentile spectra, where Y is the time weighting

F or S and N can be one of 7 defined percentiles.

In addition, the instantaneous spectra L

and L

are always available.

1) Select the Frequency Analyzer project template. (See section 3.3.1 for more details on

templates.) The project template is displayed at the top of the screen, if it does not display

Frequency Analyzer, tap the Project Template Bar at the top of the screen and select

Frequency Analyzer from the drop-down that appears.

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B&K 2250 Light Manual do Utilizador Página 121