As far as I understand, this requirement was needed in the time that insulation
materials
might have hygroscopic properties. Insulation materials as wood were common in
the past.
If they were not suitably treated, in humid circumstances insulation might drop
to unacceptable levels.
>Yes, the building ground is likely to be noisy, unless you actually connect
directly >back to its earth spike
No signal, ground or supply is noisy. It is the designer that defines a
certain conductor to be clean, and references all other voltages (probably
to be filtered) to that potential.
>I am quite sure that BS 7671 and other Code standards do not recognize that
a >screened room is outside their scopes
Of course they won't. But it is, technically.
Gert
-Original Message-
From: John Woodgate [mailto:jmw1...@btinternet.com]
Sent: Wednesday 19 July 2017 09:31
To:
I agree that (national) legislation should play a role here,
but EMC chambers are NOT ordinary equipments, nor
part of a standard electrical installation.
I would not rely on electrical codes to create a safe work environment,
and have my personal opinions prevail.
We operate in a gray area,
I second that Personal experience.
Often I give the advice to get rid of all these grounds and just create one
full continuous ground plane
including DGND AGND SGND and so on. Then customer comes back and has read
manufacturers recommendations for a chip and ignored my advice, only to
Yes, as now system "system"
is a multi-function apparatus it should comply with all applicable
standards
It should comply to EN 55012 (not CISPR12) and EN 301-489-1 or other subpart
of this series.
Note that the 301489-1 does not support Class A devices. This is especially
troublesome for IT
IEC -> EN -> BS / NL /BE / DK / NF / DIN / SE / EVS etc
Most relevant changes are in between IEC to EN, in the form of Common /
National Modifications
and the Annex to announce the ability to use in a respective directives.
(CENELEC)
Then comes the local money machine of the national
About this clause D:
Annex D Arrangement of EUT, local AE and associated cabling
...
Arrangements such as placing AE below the RGP or placing AE outside the
measurement area when it is normally located distant from the EUT may be
used to limit the effects of adverse AE emissions or to reduce
Matthew,
Adding a filtered SUBD-9 connector in the septum of your shielded room (or 2
filtered connectors in series ) allows you to route RS232 cable out of the
room, and connect it to any suitable interface. Route the EUT RS232 cable to
the centre of your turn table and along the floor to the
You did not mention the product , but I assume that
IEC 60601-2-47:2012 concerns the basic safety and essential performance
of AMBULATORY ELECTROCARDIOGRAPHIC SYSTEMS
so you probably considering such a device.
I believe that if it is required to test essential performance, and
I did not read it on this list yet (unless a post missed by box again), but
last week a new version of the list of Harmonised standards has been published
(C76 10-3-2017) for the RED (2014/53/EC) 15 pages now of our beloved
literature
Regards,
Ing. Gert Gremmen
Approvals manager
EN 60945 is used in many regulations for marine equipment.
Lloyds and Norske Veritas almost always use EN 60945 as a requirement.
EN 60945 has an extra low level limit for emissions
in de frequencies used for marine communications 156-164 MHz @ BW 9 KHz and
goes up using 120 KHz to 2 GHz.
As far
I have been carrying out extensive tests on ESD discharge currents on a lot of
different credit cards with a charged user inserting cards into a ATM type of
card reader. Client had found problems with CC-payments in dry and/or cold
regions.
The presence of metal coating (gold card) and or
Many standards express the limits for magnetic field measurements in dBuV/m, so
in E-field. Most also indicate the relation of 51.5 dB to be added
to convert H-field into E-field , ignoring close field effects.
The 60 cm loop is an old beast, and so are test conventions.
Regards,
Ing. Gert
You can put 20 people in a car, but you won’t make it for far.
There are chairs for 4 (in most cars), so charge them with four people. Logic
isn’t it ?
If a ring terminal would be made for 2 or more wires, they would allow for
two separate cable entries (and require a suitable crimping tool).
Ted, (and all other safety friends)
IMHO older cars detoriating to the level of CO coming in, will also let the
driving wind
leak in to an amount that CO is not a real problem anymore. ;<))
Highest risk is where ventilation is modified to recirculating, (to prevent
pollution coming in (!!) or
It depends. If it costs money probably they will refrain or at least be
reluctant and prefer
a warning in chinglish on page 97 note 21.
Regards,
Ing. Gert Gremmen
Approvals manager
+ ce marking of
I agree with John, batteries are the most critical part. Make sure
they are properly approved, and use a fuse in their leads.
As it's an RF product, I suppose the LVD comes into play by
means of the RTTE (RED) directive.
So a full qualification is needed.
Many aspects do not apply, but the
The general safety requirement for equipment is to be able to be `disconnected”
; a term for having no hazardous voltage inside.
A disconnect device is any system within reach of the user that allows to
disconnect the apparatus form all live voltage.
That can be double pole switch, but also a
I am sorry Ted, but that won't work. It overlooks the impact of harmonics
on capacitive reluctance. I suggest applying left magnetized ferrite.
With right handed rotating harmonics, the left rotation of the magnetic flux
will
double the amplitude and so will dissipation, and harmonic
ae in aeternum manent.
-Original Message-
From: ce-test, qualified testing bv - Gert Gremmen [mailto:g.grem...@cetest.nl]
Sent: Saturday, January 14, 2017 9:57 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] lowest emissions 4k TV?
Exactly :
Once the signal is unbalanced (whatever the reaso
Own Opinions Only www.jmwa.demon.co.uk J M
Woodgate and Associates Rayleigh England
Sylvae in aeternum manent.
-Original Message-
From: ce-test, qualified testing bv - Gert Gremmen [mailto:g.grem...@cetest.nl]
Sent: Saturday, January 14, 2017 9:57 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject
the issue, as it is for many ports on all kinds
of products.
Ralph McDiarmid
Product Compliance
Solar Business
Schneider Electric
-Original Message-----
From: ce-test, qualified testing bv - Gert Gremmen [mailto:g.grem...@cetest.nl]
Sent: Friday, January 13, 2017 1:01 AM
To: EMC-PSTC@LISTSER
Exactly. Nowadays it's easy to filter high speed ports, and in the case of
shielded cable this is even more easy.
One aspect that can be a problem is cable length. USB and HDMI are limited in
length, and in large rooms that can be a problem, needing repeaters, that can
form a new problem
Those interested, i cleaned up my temperature prediction spreadsheet
and if you want to play with it, let me know.
The math is crude, it might even have small errors.
The spreadsheet is prepopulated in column E with data from an calculated RC
network with source (green area), that you can erase,
Hi Rich,
The quotient of subsequent derivatives of equidistant samples of the
temperature has a direct relation
to the time constant. TC=Timestep/(1-(dtempn+1/dtempn))
Numerically this is easy to calculate in a spreadsheet
Once the time constant is known it is easy to find the temperature value
We have to consider that the temperatures sought are not of metrological value,
but to
to establish a safe/non-safe result. This means that the whole time constant
discussion is relevant
only when the final expected temperature is close to the standards limit value.
The mathematical limit of an
Hi Douglas,
Each of the Basic Standards from the series EN 61000-4-x ( esp -3,-4,-5, and
-6) have
their own list of test levels recommended to the committees writing the product
standard.
In general they are 1,2,3 and X.
Your product standard should not have referred to the test level number
In the close field area E-field/H-field varies with 1/(r^2) OR 1/(^3) depending
on the source
and nature of it. In addition at close distances similar fields may have an
opposite
vector polarity (close to EUT) and may partially cancel each other.
In general it is not a good idea measuring close
What I did:
Bought the largest toroidal transformer available (2200 VA), and
used copper tube (water pipe) or lightning conductors to create
one or 2 windings as a temporary
secondary. This gives you several volts at 400-500 A (AC!) before
the primary gets overloaded.
Switch the primary
o provide feedback!
Paolo
On Mon, Nov 28, 2016 at 11:32 AM, ce-test, qualified testing bv - Gert Gremmen
<g.grem...@cetest.nl> wrote:
EN 61326-1:2013 makes a date reference to CISPR11:2009+A12010 in its Annex ZA
as well as in article 2.
Par 7.2 also refers to CISPR11:2009 .
The limit referen
eration.
-Original Message-
From: John Woodgate [mailto:jmw1...@btinternet.com]
Sent: Monday 28 November 2016 12:37
To: ce-test, qualified testing bv - Gert Gremmen; EMC-PSTC@LISTSERV.IEEE.ORG
Subject: RE: [PSES] DC-power conducted emissions per CISPR11: 2016
I don't think it's careless,
you for your co-operation.
-Original Message-
From: John Woodgate [mailto:jmw1...@btinternet.com]
Sent: Monday 28 November 2016 11:45
To: ce-test, qualified testing bv - Gert Gremmen; EMC-PSTC@LISTSERV.IEEE.ORG
Subject: RE: [PSES] DC-power conducted emissions per CISPR11: 2016
material from any computer.
Thank you for your co-operation.
-Original Message-
From: ce-test, qualified testing bv - Gert Gremmen [mailto:g.grem...@cetest.nl]
Sent: Monday 28 November 2016 11:32
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] DC-power conducted emissions per CIS
EN 61326-1:2013 makes a date reference to CISPR11:2009+A12010 in its Annex ZA
as well as in article 2.
Par 7.2 also refers to CISPR11:2009 .
The limit references for Class A and B do not refer to a dated CISPR11
While I am convinced this is the kind of carefulness that is common in standards
+1
Regards,
Ing. Gert Gremmen
Approvals manager
+ ce marking of electrical/electronic equipment
+ Independent Consultancy Services
+ Compliance Testing and Design for CE marking
according to
For professional equipment
EN 55103-1 and -2 apply !
Regards,
Ing. Gert Gremmen
Approvals manager
+ ce marking of electrical/electronic equipment
+ Independent Consultancy Services
+ Compliance Testing and
I have no definite answer either but a few suggestions….
* To prevent RF current to flow away (re-radiate) from the test setup
though the capacitance between cable and clamp. Necessary of the generator is
"remote".
* The opposite: get rid of common mode voltages on
In IOT land the rock will warn the cars before it falls….. ;<)
Gert
Van: alfred1520list [mailto:alfred1520l...@gmail.com]
Verzonden: maandag 7 november 2016 20:39
Aan: EMC-PSTC@LISTSERV.IEEE.ORG
Onderwerp: Re: [PSES] Automated vehicles.
On November 7, 2016 9:03:11 AM PST, Ted
Slightly off-topic may be but.
Since a number of years, professional (penlite and other size) batteries
used in test en measurement equipment in my office
(notably those of Duracell (Procell)) seem not
to be leak proof anymore.
In my younger years (and that is not that long ago) batteries
In general 10-40 degrees Celcius is sufficient for indoor use.
Most batteries keep enough energy to get the product started/operating,
but I personally have experienced Iphones that crash when taking pictures
outdoors in winter.
( below say 5 degrees Celcius)
Same for (some) canon cameras
>Harmonised Standard covering the essential requirements of article 3.2 of the
>Directive 2014/53/EU
This phrase can mean only one thing: meant to be used as a Harmonized standard
in the sense of the directive as OJ publication.
ETSI should have written : "Intended to be harmonized….", as it
We are all used to that odor, we work with standards right ?
They are "expired" before first print.
Regards,
Ing. Gert Gremmen
Approvals manager
+ ce marking of electrical/electronic equipment
+ Independent
>The 'prohibition' also results in no requirement for warning notices to the
>user – a 'shot in foot' result.
Article 18.2 2014/30/EC requires such a warning on the EUT itself if meant for
Industrial
The EU is rather undecided -as John says- on what is "Industrial", or is it
"Heavy
There is an on-going (silent) conflict between the European commission and a
number of cenelec and cispr committees, notably those responsible
for EN 55032 and EN 55011.
While the EC has expressed their opinion in the generic standards,
and expressed their desire that all product committees
al Message-
From: John Woodgate [mailto:jmw1...@btinternet.com]
Sent: Wednesday 5 October 2016 15:05
To: ce-test, qualified testing bv - Gert Gremmen; EMC-PSTC@LISTSERV.IEEE.ORG
Subject: RE: [PSES] When is EMI testing performed?
I'd like to write this using the puzzling math symbols
y junk after all; beer for everyone.”
Ed Price
WB6WSN
Chula Vista, CA USA
-Original Message-----
From: ce-test, qualified testing bv - Gert Gremmen [mailto:g.grem...@cetest.nl]
Sent: Tuesday, October 04, 2016 9:50 PM
To: Ed Price; EMC-PSTC@LISTSERV.IEEE.ORG
Subject: RE: [PSES] When is EMI t
Hi Ed,
Can you share with us some typical EMP caused defects, and their
cause/fix ? Most of us do not share your experience in this
Regards,
Ing. Gert Gremmen
Approvals manager
+ ce marking of
There is no like button on this platform but otherwise .
Nice background info
Gert Gremmen
Van: Ken Javor [mailto:ken.ja...@emccompliance.com]
Verzonden: zondag 2 oktober 2016 7:40
Aan: EMC-PSTC@LISTSERV.IEEE.ORG
Onderwerp: Re: [PSES] Susceptible Immunity / Immune Susceptibility
Are you suggesting now that the military are pessimists ?
That gives a whole new look on the US international military policy :,)
Regards,
Ing. Gert Gremmen
Approvals manager
+ ce marking of
John Allen wrote:
>That's probably why the products from some major multinationals (as mentioned
>in the previously linked >website) could not be sold elsewhere in the major
>World markets without suitable compliance and >verification, and yet can be
>sold in the US.
I was wondering if that is
Well John,
The problem is not that immunity regulations are not reasonable (in the US),
its mere the simple fact that they are regulations that creates such a heavy
opposition.
Even under EMC colleagues / members on this list.
The opinion in the US is that bad products will weed themselves
Hi Ghery,
You need to get your numbers right Those tree entities outnumber your "real
world" by 7.
Economically by a factor 2...
Regards,
Ing. Gert Gremmen
Approvals manager
+ ce marking of
This happens all the time..
I find myself often reading under the pagefold to
find out what the original question was.
This very mail is an example, unless it was intended to ;<)
As Jim wrote
> The best and fastest responses will be on this email list
The responses arrive even before the
Well there is LinkedIn , this group has some
representation there.
IEEE Product Safety Engineering Society (PSES)
https://www.linkedin.com/groups/75652
But it's not covering these discussions (of course).
For those of use interested in an EMC LinkedIn group...
EMC Experts
I think that VFD ensure that the magnetic forces in the motor remain the same.
Magnetic forces are 1:1 related to motor current.
This way a substantial amount of torque remains available at each frequency
The key is simply keeping the drive voltage linearly related to the frequency,
so as the
By applying a 60 Hz motor to 50 Hz you (your customer) violates one of the
principles of building machines. The principle is that safe machines are built
using safe components. The latter cannot be guaranteed anymore, so the machine
is unsafe. Full stop. This is the agency way of safety
If this is for European approval, one may simply use EN 60950 and make up a
Technical construction
file listing the essential differences. A decent (now mandatory anyway) risk
analysis would cover these differences, showing up as in individual risks. You
may then choose to extrapolate 6950
Since a number of years between tests I "rinse" coaxial cables with clean
filtered DC current between tests to get rid of interference signals left over
from previous (failing) EUT.
Make sure that the dirty left-over current resulting from this action is not
contaminating your lab...
There are a few methods to use software as a safety system, making it
approach the safety of hardware:
* Use redundancy (2 processors - 2 different pieces of software
and have the two processes
communicate on their status (hardware line with function safe/unsafe)
AND or OR the
If the UK actually decides to start article 50 (so withdraw from the EU,
the landscape will not change dramatically technically, but definitely the
administrative
side will change. Joining the EEA (of EFTA) would include accepting the
requirement for free trade of labour
and that has been one of
I suppose that after the recent developments on "The Island"
it won't be brought into UK law anymore
Regards,
Ing. Gert Gremmen
Approvals manager
+ ce marking of electrical/electronic equipment
+
I think the answer to your question is the difference in product standards
between your product and the power supply.
A example: the 60950 power supply does not necessarily meet
insulation requirements (among other requirements) of the 60065.
The 60950 compatible PSU normally relies on Basic
, and neither is either
necessary or desirable.
Ken Javor
Phone: (256) 650-5261
> From: "ce-test, qualified testing bv - Gert Gremmen"
> <g.grem...@cetest.nl>
> Reply-To: "ce-test, qualified testing bv - Gert Gremmen"
> <g.grem...@cetest.nl>
> Date:
Hi Ian,
Indeed a 2-phase is enough. Ground goes directly to the
chambers ground-bolt, close to the filter. I recommend installing
an extra (redundant) separate 4mm2 or larger solid ground bonding
connector to your buildings main ground, as the leakage current for official
room-filters may easily
As long as the wires are positively retained by a second mechanical device,
and the connection is not based on soldering only: yes.
Note that it may be more complex to pass on PE to a metal enclosure or other
accessible part, without violating the contact metal-only pressure clause.
Regards,
My old LeCroy Scope Beeps -stores-prints) if a defined envelope is exceeded.
It includes a dedicated pass/fail mode.
Old versions like the 9450 9450A 9314 LT224 and many models at the time
are rather cheap on ebay. You want those with a signal processing pack.
Regards,
Ing. Gert Gremmen
I was wondering if these type of fire propagation tests are still of any
relevance.
Nowadays most electronic designs have been built with compliant (be it UL or
VDE or any other reputable test house)
and wiring is HAR or better. Enclosures are most standard -off-the-shelf- types
with a decent
I think that before the practical limits come into play, financial
limits will stop the designed chamber from further growing.. ;<))
Regards,
Ing. Gert Gremmen
Approvals manager
+ ce marking of
>“if you move a source towards / away from the antenna, the signal level should
>follow the inverse square law – correct?”
>At most frequencies, the wavelength is long compared to the dimensions of the
>shielded enclosure, so moving relative to the source is not done in a
>far-field >condition
PSES] EN55032 definition of residential environment
If a manufacturer label the product as «Class A», they do not have any
responsibility if the end user is using it in an residential environment with
its potential risk for making disturbance?
Mvh Amund
Fra: ce-test, qualified testing bv -
Creepage is only defined for the surface between INSULATOR and AIR. (and
the insulator having and insulation function of course; so on the
surface be limited by conductors)
The shortest path over the defined surface from conductor1 to conductor2
is called creepage.
Gert Gremmen
ce-test,
In the medical RA where I got a bit of experience a third factor is used
to classify the avoidability of risk.
Avoidability of the risk.
So the risk number is severity times likelihood times avoidability (why
doesn't MS Word like this word ?)
- To use the comet example, it cannot be avoided, so
There is a hierarchical problem with that Section 17.
The LV directive requires a RA and as a conclusion to that RA the standard may
be used to solve/address the issues
from the RA. It cannot be so that a Harmonised standard overrules the
LV-directive, however sense that makes from a technical
These have not been published yet, but it is to be expected
that the same lists will apply, though probably an updated
list will be published under 2014/30/EC.
Same for LVD.
Same for RED.
Regards,
Ing. Gert Gremmen
Approvals manager
I needed to add to my previous contribution to that the parameter that
controls this is called TCL value.
(John et all: = Transferse Conversion Loss ;<)) . The EMC world has been using
LISNS
for decades now that simulate a LCL (Longitudinal Conversion Loss) value of
the connected mains cable
Of course all DM current will (in a wire pair) transfer into CM, once the line
is long enough.
And a wire pair is never fully balanced ...only twisted pairs of the best
quality approach full balancing.
This topic has been subject of all kind of studies of doubtful quality where
the result was
ay 1 April 2016 09:30
To: ce-test, qualified testing bv - Gert Gremmen
Subject: RE: [PSES] EU's new approach directive transitions
A good explanation, but people not experts in the field want to know what
'FMEA' is, please.
With best wishes OOO – Own Opinions Only www.jmwa.demon.co.uk J M Wood
A "risk management process" describes how a company management addresses risks
with their products.
It describes responsibilities and functions and the process of risks, hazards
and incidents.
The "risk assessment" describes the process of determining risk of a device.
Techniques for risk
During testing you are supposed to discharge EUT after each discharge
using a ground wire, with an ionisation device
or with a permanent 2 x 470 K connection, dependent on the type of EUT
and or test set up.
Gert Gremmen
ce-test
From: Li Di [mailto:li...@conorthtech.com]
Sent: vrijdag
In general, if the application can support serial resistance,
a resistor will give you better –reproducible- results. The inductive part
of a ferrite bead may give resonances, and resistors are available in much
wider
ranges. Resistors especially SMD, have good RF properties if used on the
As a rule of thumb the transfer impedance (Zt) is the load impedance of your SA
( = 50 Ohm) multiplied
by the square of the applied windings on your probes core. You should load the
probe with
a low impedance (attenuation) network (1 Ohm ->50 Ohm) to reduce Zt and limit
the number of windings.
For only the camera only, legally you only have to deal with the EMCD.
As the supply voltage is below 72 volt DC the LVD is exempt.
Unless -as Ronald pointed out-, it’s a wireless device. The RTTE directive
(Soon RED directive) includes
safety and EMC as well as radio (=efficient use of the
The GPSD applies (1) to consumer goods only and IMHO (2) does not apply
when the LVD applies in its exempt state.
In general the GPSD is for those products that there is no other
legislation regarding safety or certain risks not covered by
legislation.
For a camera, there is : the LVD but it
Hi Doug et al,
If I understand well, the ferrite creates a virtual end of cable for EUT2,
allowing the cable to resonate ??
Interesting case, but not completely fair, as there a 2 EUT that in this
situation would require ferrite at both end of the cable.
I have not seen this effect yet on a
Immunity problems with Ethernet normally are a CM-to-DM conversion problem
caused by bad symmetry somewhere. (unless the interference takes place
elsewhere
ie before the Ethernet chips)
Don’t expect much of ferrite in the frequencies below 80 Mhz.
Conducted immunity is injected out of
nt will be needed.
Ghery S. Pettit
Vice Chairman, CISPR SC I
From: ce-test, qualified testing bv - Gert Gremmen
[mailto:g.grem...@cetest.nl]
Sent: Tuesday, December 08, 2015 9:55 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] EN55032 definition of residential environment
1.
s
well as a failure of a general duty-of-care to their patients!
John Allen
W.London, UK
From: ce-test, qualified testing bv - Gert Gremmen
[mailto:g.grem...@cetest.nl]
Sent: 09 December 2015 18:50
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] EN55032 definition of residential
1.
Independent of the standards, the EMC directive requires marking on
typeplate and/or documentation if an equipment is non-residential.
2.
Unwilling standards committees have been "reluctant" in including the
definitions in written in their standards.
CISPR I has been notorious in these
Another reason is the limited number of terrestrial power applications in this
band.
Regards,
Ing. Gert Gremmen
Approvals manager
+ ce marking of electrical/electronic equipment
+ Independent Consultancy
They are not. No public standard enforces any margin.
Even measurement uncertainty is not taken into account,
unless (in some standards) your uncertainty is larger than an assumed
(calculated) value
(depending on test set up and test type).
Regards,
Ing. Gert Gremmen
Approvals manager
Note that for some frequencies and measurements taking 6 dB of margin will
bring you dangerously close to the system noise level (automotive, marine , GHz)
In addition, emission non-compliances, caused by components and build
(enclosure, mounting, wiring) changes
come more often the in the
>We now have radiated immunity testing at 3V/m, but I have never seen a
product fail this testing at this low level.
I am operating a small Netherlands test house, and I can assure you that
many products
In my lab do fail 3V/m (at 80%AM) initially. Any analogue measurement
system
Hi Brian,
Apart from ESD problems :
My 2 cents...
High inrush currents, due to (renewed) electrical installations ?
Inrush current may happen also after a sudden interruption...
Residential mains systems have limited capacity of prospective short circuit
current.
Industrial mains may have 10's
Some thoughts
The basis should be:
- the description of intended operation and a listing of testable
parameters relevant to intended operation
- the manufacturers "product specifications under (EMC) test" for those
parameters and if not present,
- the specifications as published.
september 2015 20:09
Aan: ce-test, qualified testing bv - Gert Gremmen
Onderwerp: RE: [PSES] RF Common Mode Immunity Test Question
Gert:
Allow me to fine tune your story for accuracy. In the late 1950's, the
USA FCC re-allocated the 27 MHz region (called 11 meter band) from
amateur us
This is a typical standards clause included in a standard by non-emc
"experts".
What is a metal enclosure, and when is it not enclosure ?
Metalized plastic: is not metal but might be as good
Painted metal: complies but may have substantial potential difference
between parts
If heavy
In my point of view, there are two factors that manage screening
properties.
Conductance (linearly dependent) (higher = better screening)
Inductance ( governed by the braiding); not the longitudinal inductance
of any wire, but added inductance due to braiding
(I have seen an "optical
No , you will probably not notice any difference; my experience says
0.5 dB.
Unless the short-circuits impacted the functionality in such a way that
emission dropped also !
Gert Gremmen
From: Amund Westin [mailto:am...@westin-emission.no]
Sent: Wednesday 19 August 2015 11:55
To:
Free movement of goods throughout the EU. ;)
Gert Gremmen
-Original Message-
From: John Woodgate [mailto:j...@jmwa.demon.co.uk]
Sent: Wednesday 19 August 2015 15:08
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Friday night conundrum
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