Represents the perception and response of human hearing. Normalized for equal
sound level throughout the audible frequency range. The scale is typically
referenced to 1 kHz noise level.

luck, 
Brian 

-----Original Message----- 
From: Rob Keller [ mailto:[email protected]] 
Sent: Tuesday, April 13, 2004 12:10 PM 
To: [email protected] 
Subject: Acoustic Pressure Test 



Greetings, 

I had a client who was running the Acoustic Pressure Test described in 
UL/CSA 60950-01-03.  The question he posed was concerning the A-wieghted 
sound that is suppose to be measured.  He wondered what is the 
difference between an A-weighted sound and a non A-weighted sound.  Does 
anyone have an answer? 


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