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December 1967

The New Standard for Audiometers: Where Is It?

Arch Otolaryngol. 1967;86(6):601-602. doi:10.1001/archotol.1967.00760050603001

THE MOST recent standard for pure-tone audiometers for general diagnostic purposes issued by the American Standards Association (now the United States of America Standards Institute or USASI) is dated 1951. For at least seven years a writing group has been preparing a revision which will consolidate the specifications for diagnostic, screening, and speech audiometers in a single unified up-to-date document. The new standard is still under consideration in the Subcommittee on Bioacoustics in USASI, however, because of disagreement as to the reference zero level to be used for the calibration of pure-tone audiometers.

The writing group was unanimously in favor of adopting the new international (ISO) reference zero levels, issued in 1964, but in the full committee several important groups, including the Industrial Medical Association, several of the heavy industries and some insurance groups, objected to the ISO scale and have held firm for the old ASA-1951 levels. Meanwhile several

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