B&K 2250 Light Manual de usuario Pagina 159

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APPENDIX A
Setup Parameters
151
A.11 Tone Assessment
Table A.12 Tone Assessment Parameters
*
*. Requires Tone Assessment Option BZ-7231. Available for microphone input only.
Parameter Values Comment
Tone Assessment On
Off
Set Tone Assessment to On to enable tone
assessment functionality, then select the Tone
parameter above the spectrum to display the
results
Tone Standard ISO 1996:2-2007 ISO 1996:2-2007, Annex D is the objective
method for assessing the audibility of tones in
noise – simplified method. This method uses
1/3-octave spectra
Adjustment 0.0 to 20 dB This is the adjustment you should add to L
Aeq
if audible tones are found in the spectrum. The
resulting adjustment can be read below the
spectrum
Low Freq. Last Band 12.5 Hz to 315 Hz Set the frequency for the last band of the low
frequency range of the assessment. Default is
125 Hz
The low frequency range is from the lowest
measured frequency band to the value of the
Low Freq. Last Band parameter
Middle Freq. Last Band 160 Hz to 20 kHz Set the frequency for the last band of the
middle frequency range of the assessment.
Default is 400 Hz
The middle frequency range is from one band
higher than the Low Freq. Last Band
parameter to the value of the Middle Freq.
Last Band parameter
Level Difference Low 0.1 to 100.0 dB Set the required level difference for detecting
a tone in the low frequency range.
Default is 15 dB
Level Difference Middle 0.1 to 100.0 dB Set the required level difference for detecting
a tone in the middle frequency range.
Default is 8 dB
Level Difference High 0.1 to 100.0 dB Set the required level difference for detecting
a tone in the high frequency range.
Default is 5 dB
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