Chapter 2 – Operation
9Sound Calibrator Type 4231
User Manual
Table 2.1 Calibration levels for various sound fields and sizes of Brüel & Kjær microphones
(SPL at 94.0 dB level)
✐Please note:
• If you have increased the sound pressure level to 114 dB, by using the
level step button, please note that you should add 20 dB to the figures
in Table 2.1.
• A sound field correction may automatically be included in the
calibration routine of the sound level meter. If in doubt, consult the
instruction manual for your sound level meter. For Brüel & Kjær sound
level meters Type 2245, 2250, 2250-L and 2270, the correction is
included.
Sound
Field
Microphone
1 1/2 1/4 1/8
Free-field 93.70 dB 93.85 dB 94.00 dB
Random 94.00 dB
Pressure 94.00 dB
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