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TEST & CERTIFICATION FEATURE


seemingly redundant testing. Therefore, if manufacturers are shipping products to multiple markets outside the European Union, it is likely that they will need to evaluate their product to a wider variety of standards. Also, EN 55032 recognises that whilst a


product may not be marketed globally, it may be used by the end user worldwide. For example, you might take your CE marked tablet on holiday with you and need to charge it up via a power adapter in your hotel room. It is therefore recommended that any equipment intended for worldwide use is tested at two voltages, 110 V and 230 V, to cover any anomalies when supplied at an alternative voltage. For products that have been tested to the


previous standards, a simple gap analysis can be carried out and recorded in a Consultant’s Opinion Letter, which can be included in the equipment’s relevant Technical File. This letter would include where previous testing carried out meets the requirements of EN 55032, as well as identify where further testing is required.


OPTIMISE TIME-TO-MARKET As manufacturers are under pressure to maintain quality, minimising the costs and time associated with EMC testing is vital. The answer to this is to be properly prepared before products are sent to the test laboratory. A test laboratory sees many thousands of products each year – they will not be familiar


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with your product, so you must brief them fully. A successful testing programme is the result of you disclosing as much information to your chosen EMC test laboratory about the EUT as early as possible in the project cycle, with a special focus on the display capabilities and I/O port mix. Details about the port type and expected


cable construction can have a dramatic impact on both the test method deployed, and the time the testing takes. It is therefore vital that you give your chosen EMC testing laboratory a full understanding of the EUT, its primary and


any secondary functions, display type, typical display content, display resolution capability and environmental parameters. Before commencing testing, the laboratory


undertaking the EMC tests will also require details on the ports, including whether the port lines are balanced/unbalanced, the number of lines or pairs, and whether they are screened or unscreened. This will help the laboratory to develop a realistic test plan, enabling you to more accurately anticipate time to market for products.


TÜV SÜD www.tuvsud.com/uk








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