Thanks to all who commented.
Jim
__
James L. Knighten, Ph.D.
EMC Engineer
Teradata Corporation
17095 Via Del Campo
San Diego, CA 92127
858-485-2537 - phone
858-485-3788 - fax (unattended)
-Original Message-
From: Kunde, Brian [mailto:brian_ku...@lecotc.com]
Strange. I don't know what's going on but in the last few months my office has
been bombarded with sound level questions on our products from customers in
NA, EU, Hong Kong, and South Africa. Did someone publish a news story on ESPN
or something?
We perform a simple sound pressure level test here
In message <9be66bc0a99445adb49a0459149e0...@tamuracorp.com>, dated Mon,
8 Aug 2011, Brian Oconnell writes:
>FWIW, OSHA says that 8 hours @90dB is ok.
In machine shops, yes, but not in offices. You need to be able to hear
yourself think. 55 dB A is about right; it would be very difficult to
In message <162dbf66b3c14a33b8c9f948f8cf3...@tamuracorp.com>, dated Mon,
8 Aug 2011, Brian Oconnell writes:
>Sound-level testing can become just as complex and expensive as the EMC
>stuff. Stomp on this bug before it can reproduce.
I agree: the results are so environment-dependent that a 'lab'
In message
,
dated Mon, 8 Aug 2011, "McInturff, Gary"
writes:
>Depending on the measurement technique it can be pretty expensive, but
>you can still get a good idea of the anticipated readings in a very
>quiet room with some relatively inexpensive sound level meters. The
>formal methods are
Gary,
This looks more confusing than EMC...
A few customers have asked me about acoustic noise (because my little p/s
fan cannot be heard over their bank of rack fans). I have yet to determine
what requirements/limits are NORMATIVE for NA or the EU in an office
enviroment. Any guidance?
FWIW, OS
Brian,
I'm not sure about product specific standards, but you might look at
telecommunications standards such as ITSI 300-019 (I think) series and the US
NEB GR 1089 and companion standards or some guidance. But very briefly they
discuss a "quiet office" at about 55 dBA. But there are lots
Did the last version of this std ever get out of 'Final Draft' stage?
Forgot that I had a customer spec this last year -> cannot be used alone, as
very little is described other than limits and environmental scopes; see the
list of NORMATIVE refs in the std.
For equipment config, had something li
Group
Looking for mains-48Vdc PSU for outdoor installed equipment and client having
trouble finding suitable PSU
Does anyone know of an outdoor mains-48 Vdc PSU that meets IEC60950 creepage
and clearance requirements (as either Class I or Class II) and is NRTL
recognised?
Regards
Char
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