Recommend Link
  
Formula Frequencies (Hz) Low Fence (dB) High Fence (dB) Better Ear Ratio
AAO 1979 500, 1000, 2000, 3000 25 92 5 : 1
AAOO 1959 500, 1000, 2000 25 92 5 : 1
NIOSH-FECA
1972
1000, 2000, 3000 25 92 5 : 1
NIOSH-1997
See About Calculator
1000, 2000, 3000, 4000 25 92 5 : 1
British Society 
of Audiology
500, 1000, 2000, 4000 25 92 5 : 1
Wisconsin
(CHABA*)
1000, 2000, 3000 35 92 4 : 1
Oregon 500, 1000, 2000, 4000, 6000 25 92 5 : 1
Ireland 500, 1000, 2000, 4000 20 100 4 : 1

 

To add additional equations or report errors, please contact: 

* CHABA:  Committee on hearing, bioacoustics, and biomechanics for the
National Academy of Sciences---National Research Council.

Kevin Kavanagh Copyright  2003.   All rights reserved.      Webpage last updated: 08/16/2013        Search Website

 

 

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