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Chapter 7
Service and Repair
Sound Intensity Calibrator Type 4297 is designed and constructed to provide many years of
reliable operation. For repair, consult your local Brüel & Kjær service representative. Under no
circumstances should repair be attempted by persons not qualified in the service of electronic
measuring instrumentation.
Your local Brüel & Kjær service representative is able to replace the two-part black rubber gasket
that surrounds the intensity probe sound source. Following replacement of the gasket, your local
service centre will perform a test to ensure that the sound intensity probe can be correctly
positioned and that the calibration signal is properly applied.
If any other repair is necessary, the calibrator must be returned to the Brüel & Kjær Service Centre
at Nærum, Denmark.
Accredited Initial Calibration
When supplied new from the factory, your Sound Intensity Calibrator Type 4297 fully conforms
to the ISO 9000 Standard.
It is also possible to supply the unit with Accredited Initial Calibration, Pressure-Residual
Intensity Index Verification (part number 4297 CAI). The actual measured and documented
values will then be immediately available.
Accredited Calibration
It is recommended that you return your Sound Intensity Calibrator Type 4297 to the Brüel & Kjær
Service Centre at Nærum, Denmark, for Accredited Calibration (part number 4297 CAF) every
12 months. Your local service representative can arrange this for you.
Conformance Test
If documentary evidence of full conformance to the published specification is required, this can
be provided with new instruments (part number 4297 TCF).
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