BRUEL & KJAER 4297 User Manual page 10

2 Sound Intensity Calibrator Type 4297 – User Manual
Type 4297 is intended for use with Brüel & Kjær Sound Intensity Probes Type 3599 or 3654 (or
earlier Types 3545, 3548, 3583, 3584 or 3595) with a Sound Intensity Microphone Pair Type 4197
(or earlier Type 4181). The microphones must be used with ¼" preamplifiers, and a 12 mm spacer.
Note that Type 4297 can be used up to 6.3 kHz without a spacer to check the pressure-residual
intensity index.
The Sound Intensity Calibrator can be used for calibration of sound pressure sensitivity. To do
this, the microphones are both positioned in the calibration chamber. There is no need to
dismantle the probe and both microphones are exposed to exactly the same sound pressure
(amplitude and phase).
The broad-band pink noise sound source is provided for measurement of the pressure-residual
intensity index spectrum. This is used to assess the accuracy of sound intensity measurements.
A calibration chart is supplied that states the levels that should be detected during calibration.
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The wrist strap has a protection plug attached. This is designed to be placed inside the
Please note:
calibrator to prevent dust and dirt entering the acoustic chamber when the instrument is
not in use. The rubber gasket can be cleaned with a clean dry cloth. To remove specks of
grease or other sticky substances, use a a cloth slightly dampened with pure alcohol.
Fig.1.1 Sound Intensity Calibrator Type 4297