Comparison of International Standards
 
 
which deals with the maximum permissible ambient noise levels for audiometric test rooms.
 

     
   
  Why did I decide to compare the international standards?  
  Last year I prepared the procedure for calibration of speech audiometers (speech audiometry is carried out in a sound field in the Czech Republic). One of the most important things in this field is to have a quiet enough place where the testing can be performed. I found out that many of these rooms/booths in our country did not fit the criteria which were prescribed in the ISO 8253-2 standard.  
  I was curious about the differences between the ISO standards and the standards outside of the Europe. As I hadn't any information about maximum permissible ambient noise levels for audiometric test rooms in standards other than ISO 8253-1 and 2 so I decided to find out more about this problem.  
   
  First I would like to thank:  
  Mr. Tom Frank, USA  
  Mr. Michael Der, Canada - and his website  
  Mr. Erik Fry, Australia  
  Mr. Utz Richter, Germany  
  Ms. Janine Avison, UK  
  Mr. Timothy Sherwood, UK - and his website  
  Mr. Miloslav Gross, Czech Rep.  
   
 
 
   
   
  Note:  
  All values in the tables mean differences in dB SPL.  
  I'm very sorry that decimal commas (used in Czech rep.) are sometimes used in thetables instead decimal points.  
If I use "ISO" or "ANSI" or "AS" it means ISO 8253-1,2,3 or ANSI S3.1-1991/1999 or AS/NZS 1269.4:1998.  
 
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  References:  
   
  International Organization for Standardization, 1989. Acoustics. Audiometric test methods - Part 1: Basic pure tone air and bone conduction threshold audiometry. ISO 8253-1:1989  
  International Organization for Standardization, 1992. Acoustics. Audiometric test methods - Part 2: Sound field audiometry with pure tone and narrow-band test signals. ISO 8253-2:1992  
  American National Standards Institute, 1991. Maximum permissible ambient noise levels for audiometric test rooms. ANSI S3.1-1991  
  American National Standards Institute, 1999. Maximum permissible ambient noise levels for audiometric test rooms. ANSI S3.1-1999  
  Australian Standard/New Zealand Standard, 1998. Occupational noise management auditory assessment. AS/NZS 1269.4:1998  
  Ocupational Safety & Health Administration, OSHA Regulations, 1995? Audiometric test rooms. 1910.95AppD  
  Berry, B. F., 1973. Ambient noise limits for audiometry. NPL Acoustics Report Ac 60 (February 1973)  
  FRANK, T., 2000?. ANSI Update:maximum permissible ambient noise levels for audiometric test rooms. http://journals.asha.org/1059-0089/v9n2/frank.pdf  
  FRANK, T, DURRANT, J. D. , LOVRINIC, J. M., 1993. Maximum permissible ambient noise levels for audiometric test rooms. http://journals.asha.org/1059-0089/v2n1/033.pdf  
 
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