Sound Level Meter Types 2245 –
Instruction Manual
Page 55 of 110
4.8 Self-generated Noise
Self-generated noise is given for nominal microphone Open Circuit Sensitivity, with
Measurement settings > Input > Sound Field set to
Free-field
and no microphone
accessories selected.
4.8.1 Maximum Broadband Self-generated Noise
Table 4.1 Maximum broadband self-generated noise
4.8.2 Typical Broadband Self-generated Noise
Table 4.2 Typical broadband self- generated noise
4.8.3 Typical Self-generated Noise Spectra
Typical spectra for self-generated noise are shown in Fig. 4.13 to Fig. 4.14.
Fig. 4.13 Typical self-generated noise, 1/1-octave band
Microphone 16.0 14.8 14.8 16.8
Electrical 11.5 11.2 13.7 20.4
Total 17.3 16.4 17.3 21.9
Microphone 14.9 13.7 13.8 15.5
Electrical 9.8 9.5 12.2 18.8
Total 16.1 15.1 16.1 20.5
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