Chapter 3 – Taking Measurements
Calibration
BB 1219 – 11
19
Integrating Sound Level Meter Type 2239 A
User Manual
6. Set the calibrator to emit a 1 kHz signal at 94 dB (see the
calibrator’s user manual for instructions). Type 4231 does
this automatically.
7. Press on the sound level meter to display the Cali-
bration Window, as shown in Fig. 3.2.
8. Check your calibrator’s documentation for the correct cal-
ibration level. Different values are usually listed for free-
field (IEC standard – usually 93.85 dB) and diffuse-field
(ANSI standard – usually 94 dB) calibrations. Pressure-field
calibrations are the same for both standards (usually
94 dB). In some cases, you may need to round to the
nearest tenth of a dB. For example, if your calibrator’s
Fig.3.1 Sound Level Calibrator Type 4231 fitted onto a sound level meter
bb221911.book Page 19 Tuesday, July 24, 2001 11:23 AM
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