B&K 2250 Light Manual do Utilizador descarregar pdf (Página 255)

APPENDIX A

Setup Parameters

243

Automatic Gain Control

†

Off

To ease identification of sound sources, the gain can

be automatically adjusted to keep the average level

within a 40 dB range. When playing back the recorded

signal, you will then hear clearly the whole signal

content, whether the level has been 20 dB or 140 dB.

Set Automatic Gain Control to On to convert the

recorded signal. The recorded signal is stored as a

16-bit .WAV file.

Set Automatic Gain Control to Off for recording the

signal with a fixed gain – then set Resolution = 24 bit

(recommended) to cover the full 120 dB dynamic

range (from max. input level and down) or select

Resolution = 16 bit and specify the Peak Recording

Level to fit the signal.

Note: If the sound contains very high levels at low

frequency, then a fixed gain is recommended

Resolution 24 bit

16 bit

Set Resolution to 24 bit to cover the full dynamic

range. Set Resolution to 16 bit to cover up to 96 dB

from Peak Recording Level and down.

Note: You will only be warned about overload in the

recorded signal if Automatic Gain Control is On or if

Resolution is 24 bit or if Peak Recording Level is set to

its maximum value

Note: 24-bit recording not possible in BZ-7227

Peak Recording Level 145 dB

135 dB

125 dB

115 dB

105 dB

95 dB

85 dB

75 dB

For Automatic Gain Control = Off and Resolution = 16

bit the recorded wave file has a dynamic range of up to

96 dB. When playing back on the analyzer, the

dynamic range of the output is approx. 75 dB. When

playing back on a PC it might be even lower. Set Peak

Recording Level to fit the signal.

The values for Peak Recording Level take the

sensitivity of the attached transducer into account. The

values shown in the list here are nominal values for a

Type 4189 or 4190 microphone.

Hint: Monitor the L

peak

value during a trial

measurement before selecting the Peak Recording

Level

Note: For recording in 2-channel templates the Peak

Recording Level will automatically be set in

accordance with the Input > Range Setting parameter

(i.e., High Range or Low Range)

Table A.13 (Cont.) Signal Recording parameters

Parameter Values Comment

1 2 ... 250 251 252 253 254 255 256 257 258 259 260 ... 331 332

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