Just to confirm _ are these values the SPL at the ear? If not, where? ? The room? To comply with test standards the ear phones must proviide suffiicient attenuation to suppress the background noise. The quality of headphones determines room background noise. Another option I would like to ask is whether active head phones such ass bose are acceptable for testing in noisier environments? Sue
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-----Original Message-----
From: Karen Shea <[log in to unmask]>
Date: Wed, 9 Jan 2008 14:17:29
To:[log in to unmask]
Subject: Re: [OCC-HEALTH] Ambient noise levels during audiometry
Hi
Even sillier but I thought that the maximum was 30db(A) and it is important to monitor noise and log on tests that they where not completed in a sound proof booth. Also you have to look at the type of audio cups. There is apparently HSE guidance on this please see what I could find
Appendix 1: Maximum permissible ambient sound pressure levels (from ISO 8253-2)
The ambient SPLs given in the table below are the maximum that should be present when testing down to 250 Hz and to 0 dB HL. In practice, it is more realistic to aim to test down to 10 dB HL, in which case 10 dB can be added to these figures.
Mid-frequency
(Hz) Maximum permissible level (dB SPL)
31.5 60
40 53
50 46
63 41
80 36
100 32
125 25
160 18
200 12
250 10
315 8
400 6
500 5
630 5
800 4
1000 4
1250 4
1600 5
2000 5
2500 3
3150 1
4000 -1
5000 1
6300 6
8000 12
Regards
Karen
Karen Shea
MSc, RGN, OHN Dip, MIOSH
Occupational Health Manager
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-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]] On Behalf Of Glenn Raybone
Sent: 09 January 2008 14:09
To: [log in to unmask]
Subject: Re: [OCC-HEALTH] Ambient noise levels during audiometry
hello
can I ask a daft question regarding this?
So if you are doing audio's (without a booth) you can have up to 50dB background noise and the result will still be valid? Do you have to compensate on the result for this background noise?
Do you record/assess the background noise at the time of the test?
Regards
Glenn
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