B&K 2250 Light Manual do Utilizador Página 44

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CHAPTER 4
Specifications
39
4.8 Self-generated Noise
Self-generated noise is given for nominal microphone Open Circuit Sensitivity.
4.8.1 Maximum Broadband Self-generated Noise
4.8.2 Typical Broadband Self-generated Noise
4.8.3 Typical Self-generated Noise Spectra
Typical spectra for self-generated noise are shown in Fig.4.25 and Fig.4.26.
Table 4.1
Maximum Broadband
Self-generated Noise
Maximum Noise
Frequency Weighting (dB)
A-weighting C-weighting
Z-weighting
a
a. 30 seconds L
Zeq
Z-weighting
a
Extended Low
Frequency
Microphone 16.1 15.0 16.8 16.8
Electrical 15.7 16.3 21.4 28.4
Total 18.9 18.7 22.7 28.7
Table 4.2
Typical Broadband
Self-generated Noise
Maximum Noise
Frequency Weighting (dB)
A-weighting C-weighting
Z-weighting
a
a. 30 seconds L
Zeq
Z-weighting
a
Extended Low
Frequency
Microphone 14.6 13.5 15.3 15.3
Electrical 12.5 13.1 18.1 25.5
Total 16.7 16.3 19.9 25.9
BE171211.book Page 39 Thursday, May 27, 2004 1:01 PM
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