It all depends on the type of machinery and the intended application. Please
share some more information with us.
Happy Thanksgiving
Peter Merguerian
Go Global Compliance Inc.
pe...@goglobalcompliance.com
(408) 416-3772
H
Sent from my iPhone
On Nov 24, 2010, at 10:29 AM, Pete Perkins
In message FCA549BE3ECF9D4CB8CB8576837EA4890A7744@ZEUS.cetest.local,
dated Wed, 24 Nov 2010, ce-test, qualified testing bv - Gert Gremmen
g.grem...@cetest.nl writes:
Magnetic fields from cabling carrying larges currents will couple
through the shield.
Well, not if it's grounded at all
In message 4ced7e8b.9020...@emcesd.com, dated Wed, 24 Nov 2010, Doug
Smith d...@emcesd.com writes:
Sometimes the shield can cause high frequency problems as it is just a
thick wire. I documented this in a paper published at the EMC'94 Roma
Symposium. One problem can happen when CM shield
Hello all, We have a shipment of products that fall outside of the scope of
the SASO program and thus cannot get a C of C for the shipment. Has anyone
faced this situation, if so how did you handle it.
Thank You,
Jay Sotherden
Certification Specialist
Cooper Crouse-Hinds - Syracuse,
Hi John and the group,
Sometimes the shield can cause high frequency problems as it is just a thick
wire. I documented this in a paper published at the EMC'94 Roma Symposium. One
problem can happen when CM shield currents land on a PC chassis and then get
into the internal circuits through seams
I would not use STP for industrial applications as you point out.
STP has no added value to Ethernet signals. The CAT 5 (and 6) have such
good symmetry that the shielding is of no value anymore.
Note that the shield part principally operates for electrical fields
only, such
as high voltage power
In message 8F3FCCF474B9484DAE45A95D68B5379E@christopher, dated Wed, 24
Nov 2010, Chris Wells radioactive55...@comcast.net writes:
We also use multipoint RS485 serial communication links in our power
gear that can go thousands of feet between separate gear line ups. In
this application we
We need to find an EMC lab to work with on a test plan for in-situ testing in
the Nashville TN area. The ideal company would have experience in doing
in-situ testing and in creating a plan to meet the Essential Requirements of
the EMC Directive rather than taking the harmonized standards route,
I am looking for some feedback on the proper/practical treatment of Ethernet
STP Cat5 cable shields. The interfaces are running 100 Base Tx. The STP
cables typically are DC grounded at each end to the RJ45 jack and then often
metal shield fingers contact a metal housing that is grounded. From a
A company is planning to expand manufacturing into China and will supply
their own custom designed equipment for their facility.
What safety and regulatory requirements apply to this equipment being
imported into China?
:) br, Pete
Peter E Perkins, PE
Principal
In message
d250d01e39356a4e9cc3b4b459d6655008f...@ms-cda-01.advanced-input.com,
dated Wed, 24 Nov 2010, McInturff, Gary gary.mcintu...@esterline.com
writes:
Still if somebody with deep pockets wished to take it on that could
change but I don't see anyone particularly interested in doing so.
I think one of the issues is not 'does an anechoic chamber (large or small)
give good results' the issue is what does the regulator use as a reference
to their standards and what are 'good results'.
It is not very likely that a small anechoic chamber will meet NSA
requirements comparable to that
The good news about national accreditation for test labs and MRA's with other
countries is that we don't have to test multiple times for the world market -
the bad news is that you have to convince all countries that sign up to the
MRA's to accept the new methodology That involves politics as much
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