P&A Audiometric Services do ours - they have always been prompt and
reliable - will find address, but they are on web.
Nick Aubrey <[log in to unmask]> on 08/01/2004 14:12:44
Please respond to Occupational Health mailing list
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Subject: Re: Audiometer calibrations
following on from that, could anyone recommend an organisation that
undertakes calibration of audio equipment?
regards
Nick
-----Original Message-----
From: Sam Davies [mailto:[log in to unmask]]
Sent: 08 January 2004 13:56
To: [log in to unmask]
Subject: Audiometer calibrations
I have received a very comprehensive response which I have forwarded as I'm
sure others performing audios will find it of interest.
Regards
Samantha Davies
Occupational Health Adviser
Trinity Mirror Midlands
Tel - 0121 2363366 Ex 3099
----- Forwarded by Samantha Davies/HUMAN RESOURCES/MG_REG on 08/01/2004
13:51 -----
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08/01/2004 13:37 Subject: Audiometer
calibrations
MS26 refers to EN26189 which recommends:-
1) Daily ---- a listening check for clicks, tone switching transients,
distortion etc at 3 levels on all of the frequencies used for testing.
2) At least weekly ---- do an audiogram on someone who has thresholds
better than 25dB on each normal test frequency. Any deviation exceeding
10dB from the last test suggests an objective calibration test ( 3) below)
is required.
3) At 3 monthly intervals --- Check the frequency accuracy for each
frequency used. Check the level accuracy on each frequency and ear using
measurement instrumentation.
4) At 2 yearly intervals --- Check frequency accuracy, harmonic distortion,
level accuracy, on/off ratio and rise/fall times, condition of earphones
and cables, using measurement instrumentation.
Now, I have to admit I don't know of anyone in an occupational health dept.
who follows the above regime. EN26189 or BS 6655 as it was known, was
published back to 1986 (it was probably drafted a few years prior to that)
and modern electronics are much more stable than they used to be.
With Asra you can easily do 2) above by selecting a 3 frequency list and
doing a test on yourself or a biologic simulator. This will take no more
than 3 minutes. If you save the audiogram you produce you will be able to
click on the passive button and retrieve as many of your previous short
test audiograms as you want for comparison with the new one.
If each point is within 10dB, then according to the standard you can
continue to use the audiometer. You will also be able to listen for any
clicks etc during this test if you do it on yourself, thus satisfying 1)
above.
By doing a full calibration annually you are stretching the 3 monthly
recommendation but compressing the 2 yearly one.
Given the stability of modern PC based units I believe that to be entirely
reasonable.
Please let me know if I can help further, and if you think this reply would
be useful to other users of audiometric equipment, please post the reply to
the list.
Regards
Eric Greig
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