Traxbean Ankle Tracker Passed the EMC Test – 1

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Electromagnetic Compatibility, also known as EMC, is the interaction of electrical and electronic equipment with its electromagnetic environment, and with other equipment. All electronic devices have the potential to emit electromagnetic fields. With the proliferation of electronic devices into everyday life – TVs, washing machines, electronic ignitions, gps tracker, mobile phones, ATMs, anti-theft tags, ankle tracker to name but a few – there is therefore a huge potential for devices to interfere with each other.

Why is it necessary?

Although not as prevalent in the media as food or child toy safety, there have been several well published cases where, because electromagnetic compatibility and EMC Testing was not fully considered, products have had to be recalled or withdrawn from the market. Some well known brands have been left embarrassed by products failing to meet EMC and RF regulations. Could it also happen to you?

What are the legalities?

To prevent the occurrence of EMC problems the UK government adopted stringent laws, first back in 1992, forcing all manufacturers and importers of electronic goods to ensure that their products are electromagnetically compatible.

Business customers also often require that the products they buy are CE marked. This mark signifies that the goods meet all the relevant ‘CE Marking’ directives in place in Europe, including the EMC Directive as written into UK law by Statutory Instruments. The legislation in place guides manufacturers’ down a route of proving EMC compliance through EMC type Testing. It offers two basic methods to prove EMC Compliance:

Declaration of Conformity: EMC Testing to harmonised standards and make a declaration that the product complies, known as the EC Declaration of Conformity.

Technical Construction File: Agree an alternative or reduced test plan with a ‘Competent Body’, test and submit all relevant document to the body, known as the Technical Construction File.

Should a case come to court, the manufacturer can defend themselves if they can show that they have taken “all reasonable precautions and due diligence”. I.e. have checked the product, undertaken EMC Tests and made a concerted effort not to inadvertently break the law.

How to reduce the risk?

As EMC is an intangible phenomenon, it is difficult for manufacturer’s to know if their products are electromagnetically compatible. The only real way to find out is to conduct scientific EMC Tests. These need to be performed with a production model, and may need to be repeated at a later date to ensure compliance is maintained following changes in the production. OEM parts and accessories should come with a Declaration of Conformity and be checked for compatibility with the final product’s intended use.

Step 1 Prepare product for testing process

Test Result

We will should the whole Electromagnetic Compatibility testing process in the next following posts, please check them out.

Reference documents:
CISPR 22:2006 Information technology equipment-Radio disturbance characteristics-Limits and
methods of measurement.
IEC61000-4-6:2006 Electromagnetic compatibility(EMC)-Part 4-6:Testing and measurement
techniques-Immunity to conducted disturbances,induced by radio-frequency fields.
IEC61000-4-3:2002 Electromagnetic compatibility(EMC)-Part 4-3:Testing and measurement
techniques-Radiated,radio-frequency,electromagnetic field immunity test.
IEC61000-4-2:2001 Testing and measurement techniques-Electrostatic discharge immunity test.
IEC61000-4-5:2005 Testing and measurement techniques-surge immunity test.
IEC61000-4-4:2004 Electromagnetic compatibility(EMC)-Part 4-4:Testing and measurement
techniques-electrical fast transient/burst immunity test.
IEC61000-4-11:1999 Electromagnetic compatibility(EMC)-Part 4-11:Testing and measurement
techniques-Voltage dips,short interruptions and voltage variations