B&K 2250 Light Manual do Utilizador descarregar pdf (Página 161)

CHAPTER 14

Reverberation Time Software (Optional Module)

149

Fig.14.2 Typical RT measurement setup using a loudspeaker source

Fig.14.3 Typical RT measurement cycle for the interrupted noise method

Fig.14.3 shows a typical RT measurement cycle automatically performed by the analyzer,

where the different steps are described as follows:

1) After ‘Start’, there is a chosen ‘Escape Time’ which allows for vacating the measurement

site.

2) The noise generator is then switched on and waits for the chosen ‘Build-up’ time to allow

for a steady state to be reached.

3) The decay measurement starts. The level for the first second, or so, (labelled ‘About 1s’ on

Fig.14.3) is used to identify the excitation sound level as the 0 dB reference level.

4) The noise generator is switched off and the ‘Decay time’ starts.

5) The decay measurement ends when only the background noise level is measured

(automatically detected by the analyzer).

-1

-2

-3

-4

-5

-6

-9

-12

-18

-24

-30

-20 -10 0 dB

PowerAmplifier Type 2734

White

Pink

Generator

Remote

In Out

Level

PowerOn

Protect

Loudspeaker

Fuse

BalancedIn

230/115V AC / 650 W

OO I

2250

4292-L

2734

ZE-0948

DIRAC

110009

MP3

Player

060208

Start

Escape

Time

Build-up

Time

About 1s

Generator On

Decay time

Decay measurement

Sound Level

Time

1 2 ... 156 157 158 159 160 161 162 163 164 165 166 ... 331 332

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