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Showing posts with label electromagnetic. Show all posts
Showing posts with label electromagnetic. Show all posts

Tuesday, August 24, 2021

United Kingdom Conformity Assessment Mark (UKCA) deferred

The UK government announced August 24, 2021 that you may continue to use the CE marking for goods place on the market in Great Britain until January 2023. The UKCA marking may be used now, however, from January 1, 2023 the UKCA marking will be mandatory. 





REF:

https://www.gov.uk/guidance/placing-manufactured-goods-on-the-market-in-great-britain 

Tuesday, July 2, 2013

Google granted FCC approval for TV bands database system

google spectrum

The FCC’s Office of Engineering and Technology (OET) has granted operational approval for Google’s TV bands database system, to provide service to the public.

The TV bands database system is designed to protect broadcast TV stations, fixed broadcast auxiliary service (BAS) links, Multichannel video programing distributors (MVPDs), private land mobile and commercial mobile radio service, offshore radio telephone service, radio astronomy at specific sites and low power auxiliary service.

Some operators must specifically register to receive protection from TV band devices, such as, MVPD receive sites, wireless microphone users and temporary BAS links.

Google’s spectrum database can be found at http://www.google.org/spectrum/whitespace/index.html

REF:

http://transition.fcc.gov/Daily_Releases/Daily_Business/2013/db0628/DA-13-1472A1.pdf

Tuesday, December 4, 2012

Radio module integration and R&TTE compliance, EMC evaluation

radio module

radio module (Photo credit: ckhamken)

Building on a previous post focusing on radio module integration and the Radio and telecommunications terminal equipment (R&TTE) directive compliance, this article will focus on compliance of the combined apparatus with section 3.1(b) of the R&TTE directive, namely the essential requirements of Electromagnetic Compatibility or EMC.

As a basic primer, the R&TTE directive’s essential requirements are detailed within the directive under article 3, to paraphrase;

3.1 Essential requirements applicable to all apparatus;

       a. Safety requirements of the Low Voltage Directive, with lower limits removed

       b. Electromagnetic compatibility as per EMC directive

3.2 Effective use of radio spectrum

3.3 Construction, protection and accessibility requirements (with a number of specified items)

As posited in a previous post “Radio module integration and R&TTE compliance”, compliant radio modules installed in accordance with a manufacturer’s installation instruction require no further evaluation to article 3.2 of the R&TTE directive. However, an assessment, in most cases, will be necessary for article 3.1(a) and 3.1(b). The combined product will essentially form a new apparatus.

Given that the combined product should be assessed as a new apparatus, a couple questions may arise. What EU directive and standards apply? How do you make an assessment for EMC on the combined product?

When adding a radio to an apparatus, the new combined apparatus now falls within the scope of the R&TTE directive. ETSI EN 301 489-1 annex C gives guidance regarding this combined equipment EMC assessment, and it is based on the ETSI TR 102 070-1 technical report. In accordance with the guidance, for a combined apparatus where all products can operate independently of each other, an evaluation may be made by review of existing assessment of the individual apparatus, and if it is concluded that the combined configuration has been assessed and is representative of the combined apparatus, and, is used in according to its manufacturer’s instructions, it is not necessary to re-assess the apparatus. If there is insufficient information to make an evaluation, or the results of the evaluation are unclear, then an additional assessment shall be performed. Most of the time an assessment for EMC of the combined apparatus will not have been performed, or there is insufficient data to support a declaration of conformity.

Although under the scope of the R&TTE directive, the selection of applicable standards for EMC will be based on the primary function of the newly combined apparatus. The manufacturer shall declare the primary function and identify applicable standards from the EMC directive and/or R&TTE directive. The assessment should be supplemented with test levels and extended frequency ranges to cover both radio and non-radio aspects of the newly combined apparatus (i.e. a worst case representation of applicable levels and limits). See this flow chart from Compatible Electronics for a simplification of the assessment process based on the ETSI guidance.

The declaration of conformity will need to declare compliance with the R&TTE directive, and the party responsible for the completed combined apparatus is the party responsible for ensuring that the final configuration, when used properly, and in accordance with the provided instructions, fulfills ALL essential requirements of the R&TTE directive.

 

REF:

ETSI TR 102 070-1

ETSI EN 301 489-1 annex C

R&TTE CA TGN 01 Rev 5

GUIDELINES ON THE APPLICATION OF DIRECTIVE 2006/95/EC (par. 34)

Wednesday, April 11, 2012

New R&TTE and EMC Standards List Published in OJ

New Harmonized standards lists have been published in the Official Journal of the European Union for the Radio and Telecommunication Terminal Equipment(R&TTE) Directive and the EMC Directive.

R&TTE Directive Standards List

EMC Directive Standards List

Friday, March 30, 2012

FCC updates answer for exempt appliances

하상림 작가의 꽃 디자인이 적용된 냉장고와 김희애
하상림 작가의 꽃 디자인이 적용된 냉장고와 김희애 (Photo credit: Wikipedia)
Under Title 47, Part 15.103,  digital devices used exclusively in an appliance are exempt from the specific technical standards and other requirements of part 15. Seems simple enough, if it’s an appliance, then it’s exempt from FCC testing. So a vacuum cleaner is exempt from FCC testing, correct? How about an electric blanket? A hair dryer? A clothes iron? A juice extractor? of the previously mentioned 5 devices, 3 of them are exempt, but 2 are not, can you guess which ones are not exempt?

Did you guess correctly? This is where the old adage “the devil is in the details” comes to play. As is the case with much of the FCC rules, they are simply written, but often difficult to interpret. Thankfully the Office of Engineering and Technology (OET) has a Knowledge Base (KDB) system at https://apps.fcc.gov/oetcf/kdb/index.cfm, where one could go and research common questions or ask a question if needed.

One such KDB, answers the question “What household appliances, identified as Part 15 unintentional radiators, are considered exempt from the equipment authorization procedures?”.
On March 29th 2012 the answer was updated by adding to the list of Non-Exempt Devices; Power Tools, Cordless Multi-Tools and Battery Operated Tools . That is to say, those items are not considered appliances with respect to the 15.103 exemption and are subject to FCC testing.
 
Ref;
Publication Number 772105 (3/29/2012) (new)
Publication Number 772105 (11/19/2009) (old)

Wednesday, February 29, 2012

2011 market surveillance report EU –are tablet PCs a target for 2012?

English: CE logo

Image via Wikipedia

Bundesnetzagentur (Federal Network Agency) of Germany, for Electricity, Gas, Telecommunications, Post and Railway has the responsibility to carry out the market surveillance under the EMC and R&TTE Directives.

The agency published a summary of the 2011 market surveillance campaign on its web site. The campaign’s primary focus in 2011 was with the EMC directive and in particular, LED lighting equipment. The report also combines results from the 2010 and 2011 campaigns to give a summary overall and to achieve a low error probability due to the larger sample size.

For some background on emissions concerning LED product, see July 2011 post “Radio interference from LED lighting”.

The surveillance looked at administrative conformity, such as marking, documentation and declarations, as well as the technical aspects of the directive namely compliance with the emissions and immunity requirements. A total of 168 products were sampled in 2011.

On the administrative side, the surveillance found that 76.8% of the samples were compliant with the CE marking requirements, while only 39.9% were compliant with the Declaration of Conformity (DoC) requirements.

For the technical assessment, 61.5% of product complied with the radio emissions requirement, and 91.3% were found immune to specific interference phenomenon, out of 46 products tested overall.

In total, only 17.3% of LED lighting equipment was found to be fully compliant.

For the “reactive market surveillance”, the overall rate of non-compliance for electromagnetic compatibility (EMC) was 38.9%. For radio and telephone terminal equipment (R&TTE) a majority, 65.5%, was found non-compliant according to the report, but most concerning was that 75.6% of the R&TTE products checked were non-compliant with the safety and health measurement requirements.

The 2011 surveillance resulted in 90 EMC sales bans, 177 R&TTE sales bans, 353 “memoranda of understanding” between the two directives, and total revenues of €1,046,000

The report details some objectives for 2012 indicating supporting the revision of the EMC and R&TTE directives and transposition into national law, including harmonizing product assessment for market surveillance, and increasing cooperation with European market surveillance and customs authorities as well as adapting the national database for market surveillance results, to the European ICSMS database.

Two product group targets were mentioned for 2012, one a coordinated German/Dutch campaign targeting tablet PCs focused on the R&TTE directive, and another targeting “Ready-made connecting devices”, or laptop power supplies.

 

ref;

Market surveillance statistics 2011

Wednesday, February 22, 2012

New EMC Directive

European flag outside the Commission

Image via Wikipedia

I thought I would include this in my Q&A series.  I have been receiving these questions often,

“Do you expect that a new EMC directive will be coming ?”

and

“What impact may it have on my current test plan or program ?” 

The answer  to part one is yes, and it could be very soon. As part of  the “Goods package”, the current EMC directive, 204/108/EC, is being amended in what is called an alignment with the New Legislative Framework of the European Union (or NLF). The EMC directive is part of what is called an “Alignment Package”. Eight other directives will also be processed in this alignment.

On the second question, the first thing to note is that the new approach directives are not technical in nature, but rather legal documents. Think of them as the “Law” of the land on the topics they cover. How you comply with the laws are another matter. The technical aspects are primarily addressed by Harmonised Standards or “EN” specifications. So, the EMC technical requirements, i.e. your testing, should not be impacted by this amendment to the EMC directive. While it is expected that the scope of the EMC directive will remain essentially the same, anytime that a directive comes up for amendment, interested parties look at it as an opportunity to address issues they may want included, see for example my post on cables being proposed: http://www.emcrules.com/2011/12/ready-made-connecting-devices-cables.html

The areas that would see significant change are;

  • your documents (Declaration of Conformity) will change.
  • A new directive number may require documents be modified, such as test reports, however there should be a reasonable transition period.
  • Traceability requirements and product labeling, with specific identifying information on each product.
  • Economic operators must keep records of supplier and distributor (already required for consumer goods)
  • New supply chain duties, harmonized across the EU.
  • Enforcement authority will be able to target more directly those infringing due to supply chain reporting requirements.
  • Expectation is that Post market surveillance activities could increase substantially (this is one of the main points of the “Goods Package”)

If not already, please subscribe to updates of the EMCrules blog. The blog is helpful in providing timely information on rule changes, and other topical news, that may affect our broad clientele. Comments are welcome.

 

ref;

EMC directive at EUR-Lex -  32004L0108

/* COM/2011/0763 final */  (Alignment of ten technical harmonisation directives to Decision No 768/2008/EC)

Marketing of products - CE conformity marking

New Legislative Framework (NLF) Alignment Package

Proposals to Align Nine Directives with the New Legislative Framework – Published by BIS Department for Business Innovation & Skills

Single market for goods New Legislative Framework

Monday, December 26, 2011

Ready-Made Connecting devices (cables) under EMC directive?

EMC test with stripline
Image via Wikipedia
During the revision of the EMC directive 89/336/EEC, back in 2003, one of the most controversial proposals was the inclusion of “Ready-made connecting devices” within the scope of the EMC directive.

Ready-made connecting devices would encompass passive product, typically 3rd party in nature, designed to interconnect and be connected to apparatus covered within the scope of the directive, in effect classifying such connecting devices as apparatus themselves within the scope of the directive.

Products such as network cables, Audio / Video cables, and other interconnecting cables and adaptors would come under such classification and be subject to the protection requirements of the EMC directive (to paraphrase; must not interfere with others and must operate in the presence of interference without significant loss of performance) , thus requiring testing and marking as any other apparatus would.

It was argued that the term, “Ready-made connecting devices”, itself was ambiguous and unclear. Eventually it was decided that the devices represented no major interference potential, and because of the costs manufactures would incur for testing and marking, it was removed from the scope of the directive.

With the current revision and alignment of the EMC Directive with New Legislative Framework (NLF), the EMC directive 204/108/EC once again is subject to modification, and potential scope expansion. One such change being circulated for inclusion is that ready-made connecting devices be considered again and brought under the regime of the EMC directive.

In a proposal from the German Administration (BNetza), it is argued that in light of experience gained since 2003, the non interference claims argument cannot be maintained. The proposal claims there is no longer any serious doubt that insufficiently shielded connecting devices greatly increase the interference potential of TV and Cable networks in particular. The proposal cites several reports with data supporting this conclusion. One such report shows a  peak 30dB difference in screening effectiveness between two types tested, from most to least shielding, and notes that cable connectors can contribute around 10 dB of difference. See   ”The Concise Report of the CENELEC/ETSI Joint Working Group on the digital dividend" of 12 August 2010 (section 7.3)

The proposal suggests  that the following requirement be added to the new EMC directive;
Ready-made connecting devices, although incapable of generating electromagnetic disturbance in isolation, may generate or transmit electromagnetic disturbance when connected to an apparatus and should therefore be considered to be apparatus for the purposes of this Directive.


With ready-made connecting devices being defined as;
ready-made connecting devices' intended for connection to an apparatus by an end user for the transmission of signals, which are placed on the market separately from such apparatus, and which are liable to generate or transmit electromagnetic disturbance when connected to it.


This addition would then subject cables and connectors to the same technical requirements as any other product under the EMC directive, regardless of the component’s active or passive nature.

Thursday, December 15, 2011

EN 55013 modified and draft going for vote

Under construction

Image via Wikipedia

EN 55013 is the EMC emissions standard for broadcast receivers and associated equipment. The standard is aligned with the European Union’s EMC directive as published in the official journal. The EMC directive is a CE marking directive, and compliance with this directive is compulsory for most electrical / electronic products prior to placing on the European market.

Previously reported in a post back in the summer of 2009, EN 55013, QP vs RMS, it was noted that the EU commission was holding off publishing reference to the newest edition of EN 55013, 2009, in the Official Journal.

The CENELEC technical committee, CLC/TC 210, had decided that the standard should not be published, without the link to the EMC Directive, and accordingly has set up a task force to seek a resolution.

It was agreed that the new draft common modifications should be circulated under UAP. The current project name is EN 55013:201X

The CLC/TC 210 Secretary proposed that the following explanation appear in the forward to the draft common modifications, furthermore this is not to be included in the final publish standard, should the draft be accepted:

“The text of CISPR/I/296/FDIS, the future CISPR 13 ed 5.0, received a positive vote in CENELEC, but was not ratified due to technical objections raised by the EMC Consultant. These would have prevented the listing of the standard in the Official Journal of the European Union as a harmonised standard providing a presumption of conformity with the protection requirements of the EMC Directive 2004/108/EC. The following draft includes common modifications to address these objections, and they have been agreed by the EMC Consultant and the responsible committee, TC210. It is submitted to UAP.”

It is expected that in light of the upcoming CISPR 32, perhaps appearing within a couple years, that EN 55013 will then be deleted. At that time, the use of the QP detector will have become obsolete and replaced by the RMS/Average detector.

It should be noted that the UK is not in favor of issuing the document under UAP, nor is Italy. The UK proposes to wait and see what happens with CISPR 32. The draft will be submitted under UAP none the less.

Wednesday, December 14, 2011

The last word on Power Line telecom (PLT) in the EU, EN 55022:2006 applies in full, maybe….

P1304138.jpg

Image by Sigfrid Lundberg via Flickr

Power Line communication devices continue to be a controversial subject, with respect to the Electromagnetic Compatibility of such devices. We have been following this subject for both the United States, and for Europe. The latest round comes from across the pond with the rejection (negative vote) of the European Norm targeted to cover the testing of these devices, prEN 50561-1:201X. For background on this topic, see my past article “An update on PLT, Power Line Telecommunications, in Europe”.

Due to the negative vote on prEN 50561-1:201X, and a lack of a specific standard covering the emissions testing for PLT devices, EN 55022:2006 applies in full for these devices as of October 1st. It should be noted that many newer high speed advanced PLT devices cannot pass the requirements of EN 55022:2006 at this time.

This conclusion will be confirmed by a note published in the Official Journal reference to harmonized standards under the EMC directive.

CENELEC may offer a second vote, indicating that the choice is between EN 50561-1 and EN 55022. If this vote fails, no further option exists.

What does this mean for product on the market? Are recalls required for non compliant devices? What about new product placed on the market? The Commission is expected to accept a reasonable Date of Withdrawal (DoW) as proposed by working group 11, and until that date, manufacturers should still be able to continue placing product on the market using the Declaration of Conformity and Notified Body TCF path. The EU market authorities are “encouraged” to accept this.

The group of European Notified Bodies are meeting to discuss, and will consider the Technical Guidance Note (TGN) on the matter, after the meeting. Is this the end of the debate? Time will only tell, and we’ll continue to post when we learn more.

Monday, October 3, 2011

EMC list of harmonized standards update, new ITE standards

European Union

Image via Wikipedia

The list of standards for use under the EMC directive, 2004/108/EC, published in the Official Journal of the European Union has been updated.

Among the updates within the list are the inclusions of the 6th edition of the emissions, and 2nd edition of the immunity standards, for Information Technology Equipment (ITE), titled EN55022:2010 and EN55024:2010. These official titles are the modified version of CISPR 22:2008, and unmodified CISPR 24:2010.

The inclusion in the official journal is a prerequisite for a standard to be considered harmonized for use in the presumption of conformity with the essential requirements of a given directive. This allows these new standards to be used for compliance testing.

These new versions will supersede their predecessors on December 1st 2013, at which time they become mandatory. Any new product shipped into the European Union on or after December 1, 2013, must comply with the new ITE specifications.

You can find a copy of this list at Compatible Electronics’ European Conformity Assessment page, or at the the EC Enterprise and Industry web site when available.

 

By:

Wednesday, July 20, 2011

Power Line Communication Limits and methods of measurement draft Part 1

Draft standard EN 50561-1 Power line communication apparatus used in low voltage installations up for public inquiry. The following links point to further information on this upcoming test specification.






---Correction 7/21/11

This draft European Standard is submitted to CENELEC members for formal vote, not public inquiry. Deadline for voting: 2011-08-26.

The standard has a  +6 month date of announcement, a +12 month date of publication, and a +36 month date of withdrawal . The +36 month dow  is subject to change during voting.

---

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Tuesday, July 19, 2011

Radio interference from LED lighting


Interference reports suspecting LED lighting products, emitting electromagnetic energy, causing problems with VHF radios and other receivers are nothing new, just do a Google search and you’ll find complaints of such problems. These complaints are few and scattered, possibly due to the lack of mainstream adoption of LED lighting, but that is all about to change.

Many regions have, or are adopting, rules aimed at reducing waste from lighting products, from toxic substances such as mercury, as well as overall power consumption reduction of lighting products. A growing trend around the globe is the general phase-out of incandescent bulbs.

While CFLs (Compact Fluorescent Lamps) are far more efficient in terms of power consumption than traditional incandescent lighting, like all fluorescent lights, they contain mercury, a toxic substance, thus complicating disposal and presenting an environmental hazard.

An alternative to CFL is LED lighting, or Light Emitting Diode. Newer LED technology has the benefit of much lower power consumption compared to traditional lighting, as well as the reduced environmental impact, and, compared to several years ago; they are becoming increasingly more affordable. It has been stated that more than 50% of our electricity consumption for lighting would be saved if the efficacy reached 200 lm/W (lumen per Watt). LED efficacy reached 100 lm/W in 2010, and continuing the trend, they will easily hit the 200 lm/W mark by 2020 as predicted. Some companies claim that they have already attained this level of efficacy.

However, although today’s LEDs are capable of long life, and delivering high light output levels with very little power consumption, most need to be paired with a drive circuit to provide constant current sourcing to operate in our homes and offices, and that’s where the problem comes in. These switching drive circuits operate at increasingly higher frequencies, and in order to maintain the highest efficiency, and highest LED longevity possible, they also need to maintain very high slew rates. These factors contribute to the overall unwanted emissions from each individual lighting element, increasing the Electromagnetic background noise.

Electromagnetic Interference or EMI mitigation inevitably increases the overall cost of products by adding additional components to a design, or requiring a more complicated and expensive design and layout, and for low price consumer electronics, with very small profit margins, every penny counts. As EMI mitigation is considered by some as an unnecessary expense, it is often overlooked or simply disregarded. Proper operation and safety concerns also make engineering a quiet design more difficult and expensive. So the cheaper LED lighting will potentially be the most problematic in terms of interference, but they will also be the preferred choice for the average consumer, and therefore the most prevalent.

Couple the added costs with the lack of regulatory enforcement and oversight governing the EMI of these devices and you can see the potential problem this poses. Most of the interference may be caused by very high frequency emissions, typically in the 30 – 300 MHz range, and possibly higher.

In the US, most products capable of causing interference that may be used in the home and office fall under FCC Part 15 rules governing the amount of unwanted electromagnetic energy that products can produce, both conducted on the power lines, and radiated from the products themselves, to prevent interference to radio receivers and for the overall protection of the radio spectrum. For most products, compliance with these rules however is primarily based on the honor system, and requires that manufacturers be knowledgeable in the application of the rules and proper test methods. Common misinterpretation of the rules, may lead manufacturers of LED lighting to address only the lower frequency conducted disturbance, or possibly to consider themselves exempt from the rules altogether. This may only be addressed by the FCC when problem reports become widespread.

Europe has addressed, and continues to monitor, some of these issues, with the amendment of standards covering lighting product emissions, such as EN 55015:2006, adding emission measurement requirements from 30-300MHz. Confusion may still exist on the proper application of the harmonized standards, possibly leading to improper evaluation of electromagnetic emissions, and it’s questionable if the frequency range is high enough to cover some products found on the market today.

In New Zealand, a report issued in the summer of 2010 warns of the potential interference that LED lighting products could pose, and urges reports of any interference problems to the Radio Spectrum Management.
As LED lighting products enjoy mass adoption, it is possible that mysterious failures of everyday things we have come to depend upon such as remote controllers, baby monitors, radio receivers, garage door openers, security systems, just to name a few, may be just around the corner. This doesn’t need to be the case however, as the problems are preventable with careful consideration and a desire to do so.


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Friday, May 27, 2011

Do you mind turning off your RF device please?

Tin Foil Hat
Image by James Provost via Flickr
According to a Parliamentary Assembly of the Council of Europe (PACE) report issued May 6, 2011, “waiting for high level scientific and clinical proof that electromagnetic fields emanating from high frequency sources such as radar, telecommunications and mobile phones may lead to very high health and economic costs”.
PACE will be meeting in Kyiv on May 27th, and hold a debate, and intends to adopt a resolution on the issues raised in the report.
The report invokes heath concerns, in particular using examples of asbestos, lead, and tobacco, as mistakes made in the past when dealing with unknown health risks. The report also likens the potential consequences on the environment by electromagnetic fields with licensing of medication, chemicals, pesticides, heavy metals and genetically modified organisms.
The report recommends that an “as low as reasonably achievable” approach be adopted when setting standards or threshold values for emissions of electromagnetic fields of all types and frequencies. The report urges that particular attention should be given to protecting children, and “electrosensitive” persons suffering from a syndrome of intolerance to EM fields with a call to protect them from the unknown effects of electromagnetic waves by the creation of “Wave-free” areas not covered by wireless networks.
Mobile phones, DECT phones, WiFi, WLAN and WIMAX come under focus in the reports, with the call for microwave long-term exposure thresholds of not to exceed 0.6 v/m and in the medium term reduced to 0.2 v/m. The report also makes recommendations to; undertake risk-assessments prior to licensing new types of devices, calls for additional labeling and indications of health risks, produce warnings and recommendations to use a wired alternative due to the “unknown” dangers of electromagnetic fields..
The report proposes the ban of all mobile phones and wireless networking devices from schools and classrooms.

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