I wish to thank all of you who responded to my query. I now have several
ideas for trying in the current design, as well as for the layout change.
Regards, Ravinder
PCB Development and Design Department
IBM Corporation
Email: ajm...@us.ibm.com
***
Chris, it may be that the internals of that chip are generating the 40 MHz
harmonic and it is getting out onto the ground and/or power planes. First
order of business is to have a solid ground plane. Second, is to prevent
noise from the DSP chip from getting on the power plane. Create a +5V island
Hi group,
It's Friday and thinking hurts the head on a Friday, so I'll take the easier
option and just ask.
I have just returned from emissions testing on a new product. The product
uses a DSP which runs off an 8Mhz oscillator and internally 'ups' this to
40Mhz. It also has a CLOCK_OUT pin whi
My impression all along has been that the likelihood of a product being
placed in great numbers into domestic establishments is what defines Class
D. Commericial television sets and personal computers fit this definition
very well, thus their specific mention in the standard. They certainly may
Hi guys,
Sorry for the "late" response, been pretty busy lately.
I think we fool ourselves a little with this calibration stuff.
I agree with Brian's statement that much of this boils down to going through
the motions to satisfy a process, whether it's ISO, A2LA, NVLAP ... I'm not
against c
Allen, the 61000 series are "basic" standards and those type are not
published in the OJ; however, they are referenced in the harmonized
standards that are published.
Richard Woods
--
From: Allan, James [SMTP:james_al...@milgo.com]
Sent: Friday, March 02, 2001 9:44 AM
To: 'emc-pstc'
S
Group: Help me here. I know I must be overlooking something.
The R&TTE Directive 1999/5/EEC refers me to the EMC Directive 89/336/EEC.
When I search the list of harmonized standards under 89/336/EEC I do not
find any reference to either
EN 61000-4-X or EN 60555-4-X
What am I missing and how does
Forwarded for deo...@isu.co.kr
Dear Sir/Madam
I'm research engineer of ISU ceramics in south-korea.
We've got many information from your Homepage, thank you.
We are developing flexible electromagneticwave absorber, which is
applied for moble(PCS, GSM handyset), notebook. etc. (not for anechoi
I believe they are Class D because of the huge quantities of these products
in circulation. I kind of makes sense, millions and millions of PCs and
televisions hooked up to the mains are going to cause far more harmonics
havoc than a low volume product such as an HP harmonics analyser (because
no
forwarding for paul_c...@hkstc.com
Reply Separator
Subject:61000-3-2 Class D
Author: "Paul Chan"
List-Post: emc-pstc@listserv.ieee.org
Date: 3/2/01 8:57 AM
Dear Group,
I have read from here about PC, TV are definitely Class D. Can anyone sugg
Amund
You could check out the useful links page on the R&TTE Compliance Association
web site. . This association is focussed upon
understanding and effectively using EU Directives ( particularly 99/5)
in a manufacturing, testing and marketing context.
Jerry Roberton
Secretary R&
, Ray Levasseur
inimitably wrote:
>I have a number of products that must meet the requirements of EN 61000-3-3
>for voltage fluctuation but I am having problems complying. The failure
>happens when a vacuum pump is switched on during a cycle of the machine and
>then it is switched off. The inr
Hi Folks
Another possibility: try to find fully-insulated quick-release terminals
which have a manually-operated lock and don't require a tool.
(We had to do this recently when we had a similar problem with batteries n
confined spaces in vehicles)
John Allen
Thales Defence Ltd
Bracknell, UK
-
Dear Group,
I have heard that in Japan the measurement of noise is done in "horns"
rather than "decibels". Is this correct? If it is correct, what is the
conversion factor?
Peter Merguerian
Managing Director
Product Testing Division
I.T.L. (Product Testing) Ltd.
Hacharoshet 26, POB 211
Or Yehu
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