CISPR 16-4-3/TR-2004
Specification for radio disturbance and immunity measuring apparatus and methods - Part 4-3:Uncertainties, statistics and limit modelling - Statistical considerations in the determination of EMC compliance of mass-produced products

Standard No.

CISPR 16-4-3/TR-2004

Release Date

2004

Published By

International Electrotechnical Commission (IEC)

Latest

CISPR 16-4-3/TR-2004

Scope

This section addresses statistical considerations for determining electromagnetic compatibility compliance of series products. The reasons for considering this statistic are: a) The purpose of reducing interference is to ensure that most qualified products no longer cause interference; b) The limits of CISPR (International Special Committee on Radio Interference) must not only be suitable for type approval of individual products, but also Type approval of products suitable for mass production; c) Statistical techniques must be applied to ensure that mass production products comply with CISPR standards; d) The understanding of the meaning of the limit values should be the same when applied to each country, which is important for International trade is important; e) IEC national committees participating in CISPR cooperation should strive to seek recognition from the national authorities in which they are located. Therefore, this section specifies requirements and provides guidance based on statistical techniques. EMC compliance of batch products should be based on the application of statistical techniques that must assure consumers that 80% of products of the type studied comply with emission or immunity requirements with 80% confidence. Chapter 4 gives the general requirements for this so-called 80%/80% criterion. Chapter 5 gives more specific requirements for the application of the 80%/80% criterion to launch tests. Chapter 6 gives guidance on the application of the CISPR 80%/80% criterion to immunity testing. The 80%/80% guideline protects consumers from obtaining nonconforming product, but it does not represent the probability that a batch of product from a sample will be accepted. This probability of acceptance is very important to the manufacturer. Appendix A, gives more information on the probability of acceptance (manufacturer's risk).

CISPR 16-4-3/TR-2004 history

• 2004 CISPR 16-4-3/TR-2004 Specification for radio disturbance and immunity measuring apparatus and methods - Part 4-3:Uncertainties, statistics and limit modelling - Statistical considerations in the determination of EMC compliance of mass-produced products