All, Been some good discussion her about the EMC issues and why or
when to test or not test. I especially liked John Woodgate's comment that
if the emissions are well away from the limit then why bother to test; but
this does raise the issue to how would you know? And if you had to test to
know why wouldn't you run the test and include the data in your Technical
File (which amounts to running the tests anyway and showing compliance).
Additionally, it needs to be pointed out that if the Wired
Network Port is using a standard connector (RJ-45, USB etc) then it has to
be shown that the port meets the appropriate safety requirements for the
usual Network. There have been some safety requirements in 60950 for years
but these are now being updated and upgraded in 62368-3 at the insistence of
IEC ACOS to show that the port will not damage any network equipment
attached to it nor will be damaged by connecting to the standard network.
These ports are being upgraded to handle power over these communication
lines and are all moving to 100 Watts; for instance, can a person plug their
phone into your port expecting it to charge but not damage your system?.
Evaluating the ports for safety will be a requirement no matter what type of
equipment they will be used on.
Expect this to be applied broadly moving ahead.
:>) br, Pete
Peter E Perkins, PE
Principal Product Safety & Regulatory Affairs Consultant
PO Box 23427
Tigard, ORe 97281-3427
503/452-1201
IEEE Life Fellow
<mailto:[email protected]> [email protected]
From: Gert Gremmen; ce-test <[email protected]>
Sent: Tuesday, April 24, 2018 4:23 AM
To: [email protected]
Subject: Re: [PSES] EN 55032 Testing on Wired Network Port
EMC testing is like speeding by car. Did you ever try convince an officer
that you drove too fast for only a few minutes by year if caught
over-speeding? And what did he say ?
Ports do not need testing only if inoperable at all. And even than, from a
technical point of view it may generate interference. In my opinion, testing
requirements end completely when a port is not accessible to the end-user.
And the criterion is not troublesome emissions, the requirement is
over-the-limit emissions.
Like speeding by car, driving beyond speed-limits does not need to be
troublesome (by the absence of other cars for example, or by night).
Nevertheless, any speeding limit is enforced even if not troublesome.
But at the end, it is the manufacturer who decides if creating emissions
over the limit is acceptable or not. But do not complain if you get caught.
Gert Gremmen
On 24-4-2018 12:52, John Woodgate wrote:
Do you even need to justify not testing, if it doesn't produces troublesome
emissions? The only justification I can see might be that it is used only
for periods of a few minutes a few times a year.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk <http://www.woodjohn.uk>
Rayleigh, Essex UK
On 2018-04-24 11:18, itl-emc user group wrote:
A device has a wired network port used for de-bugging only.
The port is not used during normal operation of the device.
Any opinions on whether or not this port should be tested?
Regards,
David Shidlowsky| Technical Reviewer
Address 1 Bat-Sheva St. LOD 7120101 Israel
Tel 972-8-9186113 Fax 972-8-9153101
Mail : <mailto:[email protected]> [email protected]
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