Folks,
It was pointed out that my quote from SEMI S2-0200e is incorrect. I would
like to restate my question to include the correction. I apologize for any
inconvenience my error has caused. My corrected question is as follows.
.........................
Can anyone cite a reference document / standard that determines if there is
a minimum dBA sound level variation above an expected ambient environment
that is suitable for a pulsing alarm.
In my review , I have found that SEMI S2-0200E Environmental, Health, and
Safety Guideline
for Semiconductor Manufacturing Equipment states in Para. 27.1
".......Equipment should be designed to
control exposures to sound pressure levels equal to or greater than 80 dBA
continuous or intermittent sound
pressure level, and 120 dB instantaneous (impulse) sound pressure level."
Further, 29 CFR 1910.95 " Occupational noise exposure" states " . 2.) If
the variations in noise level involve maxima at intervals of 1 second or
less, it is to be considered continuous. " Are there any industry standards
that recommends a pulse level variation?
Your input on this subject is greatly appreciated.
Best Regards, Paul J Smith
Teradyne, Inc.,
Boston, MA 02111
paul.j.sm...@teradyne.com
Voice 617-422-2997
Fax 603-843-7526
Paul J Smith
10/19/2001 09:56 AM
To: "SEHS Grapevine" <s...@semi.org>, emc-p...@majordomo.ieee.org
cc:
Subject: Re: What is minimum dBA measured difference above ambient noise
for pulsing alarm. (Document link: Paul J Smith)
Folks,
Can anyone cite a reference document / standard that determines if there is
a minimum dBA sound level variation above an expected ambient environment
that is suitable for a pulsing alarm.
In my review , I have found that SEMI S2-0200E Environmental, Health, and
Safety Guideline
for Semiconductor Manufacturing Equipment states in Para. 27.1
".......Equipment should be designed to
control exposures to sound pressure levels equal to or greater than sound
pressure levels equal to or greater
than 80 dBA continuous or intermittent sound pressure level, and 120 dB
instantaneous (impulse) sound pressure level."
Further, 29 CFR 1910.95 " Occupational noise exposure" states "
............ 2.) If the variations in noise level involve maxima at
intervals of 1 second or less, it is to be considered continuous. " Are
there any industry standards that recommends a pulse level variation?
Your input on this subject is greatly appreciated.
Best Regards, Paul J Smith
Teradyne, Inc.,
Boston, MA 02111
paul.j.sm...@teradyne.com
Voice 617-422-2997
Fax 603-843-7526
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