B&K 2250 Light Manual do Utilizador descarregar pdf (Página 169)

CHAPTER 14

Reverberation Time Software (Optional Module)

157

14.3.2 Spectrum

The Spectrum tab shows the reverberation time spectrum from a position, or the room average

reverberation time, or both. The sound level is displayed during measurements.

Fig.14.7

Spectrum tab

Status Field

The Status Field on the Spectrum tab is the same as on the Overview tab.

Spectrum Graph

The Spectrum graph is the same as in the Frequency Analysis software: Two 1/1-octave, or 1/3-

octave spectra, superimposed with cursor readouts. The displayed frequency range is automatically

adjusted for the measured frequency range.

Small smileys are set below each frequency band with a potential problem. The smileys are

also available at the cursor readouts. Tap the smiley at the cursor readout to get detailed

information about the warning.

The Spectrum Parameter selectors above the graph selects which spectra to display. You can

choose to display: T20@Pos, T30@Pos, EDT@Pos, T20, T30 or EDT. If you only want one

graph you can set the other to Off.

In addition to choosing which parameter to display, you can choose to Display Sound Level –

this will display the Z-weighted spectrum LZF together with the A- and C-weighted broadband

levels – see Fig.14.8. When displaying LZF you can tap the LZF selector and select Display

Reverberation Time to display the reverberation time spectra.

When starting a measurement the graph will automatically display the sound level spectrum,

when finished it will display the reverberation time spectrum.

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B&K 2250 Light Manual do Utilizador Página 169