JJF 1281-1990O.T.N. of the Primary Standard for Audiometric Zero Level of Bone Conduction (English PDF)

JJF 1281-1990 is the English-translated version of 骨导听力零级基准操作技术规范.

JJF 1281-1990 is the Chinese metrological standard "O.T.N. of the Primary Standard for Audiometric Zero Level of Bone Conduction". It was issued by the State Administration of Petroleum and Chemical Industries. It is obsolete: it has been replaced by JJF 1281-2011.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — all pages — is available in the English PDF.

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