Most of the "front" text states that these are the minimum requirements to
place a product on the market.
If a product is designed to meet only the minimum requirements to be placed on
the market ...
Well, if the sales and volumes are not good, - due to minimal performance ...
loser !
Every product that management has pushed to ship by meeting minimum
requirements, has come back to be redesigned to better meet the requirements
with more margin. Twice the engineering costs and twice the approvals cost and
twice the delay in marketing, and a poor reputation in the market for free !!
Not counting the doubling of costs to make a comeback.
Test everything, short or long, and test to higher levels to find the margins
to failing.
For example, A product met the ESD tests as designed.
but in the field it failed ESD. Customer was negatively impressed and made
sure we knew that !
The fix, really cheap and easy, made the product immune to all the ESD tester
could do !!
30 kV all day long, directly on the contacts, no problem.
EMC is cheap and easy when applied correctly.
But there are some that will make it, EMC, out to be some sort of black magic
that is real mystery to solve.
When it is not, and can be solved and fixed rather easily.
So test to the hardest standards that you can apply and make it work with that
!!!
From: Rajneesh Raveendran <[email protected]>
To: [email protected]
Sent: Wednesday, January 13, 2016 11:10 PM
Subject: Re: [PSES] Generic EMC Precedence over Basic Standards and Fast
Transient and Surge Immunity Questions
Hi Philip,
The precedence is EMC product standards --> Generic EMC standards --> Basic EMC
publications.
The Basic EMC publications act as building blocks for Generic EMC standards &
EMC Product standards.
The Generic EMC standards act as building blocks for EMC Product standards.
You can get more info at the link - http://www.iec.ch/emc/basic_emc/
Regards,Rajneesh
On Thu, Jan 14, 2016 at 6:49 AM, Philip Stevenson <[email protected]> wrote:
Dear List Members The Generic EMC Immunity Standard BS EN/IEC 61000-6-1
references a number of "Basic Standards" which are associated with each of each
of the EMC Immunity Test Requirements. I have been advised that the Generic EMC
Immunity Standard BS EN/IEC 61000-6-1 test requirements have precedence over
the referenced "Basic Standards". Is this correct? My reason for asking relates
to the Generic EMC Immunity Standard BS EN/IEC 61000-6-1 Surge and Fast
Transient Immunity Test Requirements for a DC Power Input of a product. This
test requirement references "Basic Standards" IEC 61000-4-5and IEC 61000-4-4
in Table 3. The following questions relate to a product which is powered from a
28V dc output from a 230V ac Mains Powered COTS DC Power Supply. Surge Immunity
Question: The Generic EMC Immunity Standard BS EN/IEC 61000-6-1 Table 3 Surge
Immunity Test Requirement refers to Basic Standard IEC 61000-4-5. As previously
stated the Product is powered from a 28V dc output from a 230V ac Mains Powered
COTS DC Power Supply via a shielded cable assembly which is less than10 metres
in length. In the Basic Standard IEC 61000-4-5: 2014 Section 7.6 it states that
"No test shall be required for cables according to the manufacture's
specification are less than or equal to 10 metres." Whereas the Generic EMC
Immunity Standard BS EN/IEC 61000-6-1 Surge Immunity Test Requirement caveat
"c" states that "Apparatus with a DC power input port intended for use with a
AC-DC Adaptor shall be tested on the AC power input to the AC-DC Adaptor". As
the products DC power input cable assembly is shielded the Basic Standard
implies no testing is required. Whereas the Generic EMC Immunity Standard
implies the AC power input to the COTS DC Power Supply needs to be tested. My
question is which of these test requirements has precedence? Fast Transient
Question: The Generic EMC Immunity Standard BS EN/IEC 61000-6-1 Table 3 Fast
Transient Immunity Test Requirement caveat "d" states that "Apparatus with a DC
power input port intended for use with a AC-DC Adaptor shall be tested on the
AC power input to the AC-DC Adaptor". I have been advised that the Fast
Transient Immunity test needs to be performed on the DC Power Input cable. My
question again is which of these test requirements has precedence? I would be
grateful for any advise or guidance the members can provide on these matters.
If you prefer to reply to me be directly instead of via the list my personal
Email address is [email protected]. Regards Philip Stevenson
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IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can
be used for graphics (in well-used formats), large files, etc.Website:
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This message is from the IEEE Product Safety Engineering Society emc-pstc
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<[email protected]>
All emc-pstc postings are archived and searchable on the web at:
http://www.ieee-pses.org/emc-pstc.html
Attachments are not permitted but the IEEE PSES Online Communities site at
http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used
formats), large files, etc.
Website: http://www.ieee-pses.org/
Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe)
List rules: http://www.ieee-pses.org/listrules.html
For help, send mail to the list administrators:
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