Abstract
The National Voluntary Laboratory Accreditation Program (NVLAP) administered by the National Bureau of Standards (NBS) established a program in September 1982 to accredit laboratories that provide acoustical testing services. The Acoustics Laboratory Accreditation Program (Acoustics LAP) covers 50 national and international test methods for which laboratories can apply for accreditation. The test methods cover procedures for measuring the properties of acoustical materials, sound power and sound pressure level measurements, and field measurements of noise produced by products. Applicant laboratories are evaluated through on‐site visits by experienced assessors and by participation in proficiency testing programs administered by NVLAP. Proficiency testing programs are currently in operation for test methods ASTM C423 and ASTM E90. Seven laboratories are currently accredited for various test methods and additional laboratories are in the process of being evaluated for accreditation.
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