EMC Testing Part 1 complianceclub（EMC测试complianceclub第1部分）.pdfVIP

EMC testing Part 1 – Radiated emissions Eur Ing Keith Armstrong C.Eng MIEE MIEEE Partner, Cherry Clough Consultants, , Associate of EMC-UK Phone: 01457 871 605, Fax: 01457 820 145, Email: keith.armstrong@ Tim Williams C.Eng MIEE Director, Elmac Services, www.elmac.co.uk, Associate of EMC-UK Phone: 01243 533 361, Fax: 01243 790 535, email: elmactimw@pulink.co.uk This is the first in a series of seven bi-monthly articles on ‘do-it-yourself’ electromagnetic compatibility (EMC) testing techniques. This series will cover the whole range of test methods – from simple tests for development and fault-finding purposes, through lowest-cost EMC checks; ‘pre-compliance’ testing with various degrees of accuracy, on-site testing for large systems and installations; to full-specification compliance testing capable of meeting the requirements of national test accreditation bodies. Of course, what is low-cost to an organisation of 5000 people could be thought fairly expensive by a company of 50, and might be too expensive for a one-person outfit, but we will cover the complete range of possible costs here so that no-one is left out. Remember though, that the more you want to save money on EMC testing, or reduce the likelihood of being found selling non- compliant products, the cleverer and more skilled you need to be. Low cost, low risk, and low EMC skills do not go together. This series does not cover management and legal issues (e.g. how much testing should one do to ensure compliance with the EMC Directive). Neither does it describe how to actually perform EMC tests in sufficient detail. Much more information is available from the test standards themselves and from the references provided at the end of these articles. The topics which will be covered in these seven articles are: 1) Radiated emissions 2) Conducted emissions 3) Fast transient burst, surge, electrostatic discharge 4) Radiated imm