B&K 2250 Light Uživatelský manuál stáhnout pdf (Strana 99)

Chapter 10

1/1- and 1/3-octave Frequency Analysis

(Optional Modules)

2250 Light has two optional Frequency Analysis modules, these are:

• 1/1-octave Frequency Analysis Software for 2250 Light BZ-7131 enables you to make

1/1-octave measurements and broadband sound level measurements simultaneously

• 1/3-octave Frequency Analysis Software for 2250 Light BZ-7132 enables you to make

1/3-octave measurements and broadband sound level measurements simultaneously

Check the About Menu to see whether you have the right license to run the frequency analyzer

you require. The About Menu is accessed from the built-in help – tap on the shortcut bar,

then select About. See Chapter 9 for instructions on installing the license for the frequency

analyzer.

10.1 Setting up the Instrument

The frequency analyzer measures the following spectrum parameters 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 are saved in the project together with the measured sound level meter (broadband)

parameters.

In addition, the instantaneous spectra L

and L

are always available.

1) Select the FREQUENCY ANALYZER 1/1-OCTAVE or FREQUENCY ANALYZER

1/3-OCTAVE 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

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B&K 2250 Light Uživatelský manuál Strana 99