Proficiency Testing of Radiated Emission Testing Laboratory in China

摘要

This paper reports the results of a radiated emission proficiency testing round with the major electromagnetic compatibility (EMC) laboratories in China. Nineteen Radiated emission sites are compared using a comb generator in the frequency range of 30 to 1000 MHz. The guidelines of international standards such as ISO/IEC Guide 43-1 was followed, while the scope of the tests focused on EMC compliance of information technology devices, based on CISPR 22. Statistical metrics such as Z-score and normalized error have been adopted to assess global and individual performances of the participant laboratories. As the result of this program, to find the laboratory which had an isolated data from the group and analysis influence factors of difference of the test results. Radiated emission testing is one of the most important electromagnetic compatibility (EMC) testing items. The test result of Radiated emission is influenced by various factors. Using the comparison between laboratory, we can examine the difference among different labs. So we can design a proficiency testing (PT) of radiated emission testing to improve the consistency of the test results. Proficiency testing is an important method to confirm the testing ability of lab and is commonly used assessment performance by means of interlaboratory comparisons. China National Accreditation Service for Conformity Assessment (CNAS) ask EMC lab attending at least one proficiency testing every 2 years. China National Institute of Metrology (NIM) organized a proficiency testing of radiated emission testing according ISO/IEC17043. All the participant labs of this PT are accredited by CNAS according ISO/IEC 17025. Two factors are important for a proficiency testing (PT) of radiated emission testing. The first factor is reference sample and the second factor is statistical method.