The intention of BS EN 55022 is to establish uniform requirements for the radio disturbance level of the equipment contained in the scope, to fix limits of disturbance, to describe methods of measurement and to standardize operating conditions and interpretation of results.
The scope has been extended to the whole radio-frequency range from 9 kHz to 400 GHz, but limits are formulated only in restricted frequency bands. This is considered sufficient to reach adequate emission levels to protect radio broadcast and telecommunication services, and to allow other apparatus to operate as intended at reasonable distance.
BS EN 55022 applies to information technology equipment (ITE*).
It is for use in compliance with the EU EMC Directive.
Who should use BS EN 55022?
The standard is for:
- Design engineers for IT and telecommunications equipment
- Systems integrators
- Procurement engineers
- Importers of computer products
- Telecommunications operators and installers
- Test laboratories.
Protection of the radio spectrum from spurious interference is of vital importance to the maintenance of successful radio communications. BS EN 55022 specifies radio disturbance limits for potentially interfering spurious emissions generated by ITE products.
BS EN 55022:2006 specifies procedures for the measurement of the levels of spurious signals generated by the ITE. Limits are specified for the frequency range 9 kHz to 400 GHz for both class A and class B equipment. No measurements need be performed at frequencies where no limits are specified.
It applies to any equipment:
- - That has a primary function of either (or a combination of) entry, storage, display, retrieval, transmission, processing, switching, or control, of data and of telecommunication messages and that may be equipped with one or more terminal ports typically operated for information transfer
- - With a rated supply voltage not exceeding 600 V.
It includes, for example, data processing equipment, office machines, electronic business equipment and telecommunication equipment.
Equipment (or part of the ITE equipment) that has a primary function of radio transmission and/or reception according to the ITU Radio Regulations are not covered, nor is equipment, for which all disturbance requirements in the frequency range are explicitly formulated in other IEC or CISPR publications.
Any equipment which has a function of radio transmission and/or reception according to the definitions of the ITU Radio Regulations should fulfil the national radio regulations, whether or not this publication is also valid.
*ITE is subdivided into two categories denoted class A ITE and class B ITE.
Class A ITE is the category of all other ITE and satisfies the Class A disturbance limits but not the Class B disturbance limits.
Class B ITE satisfies the Class B disturbance limits. This class covers equipment intended primarily for use in the domestic environment and may include:
- Equipment with no fixed place of use, for example, portable equipment powered by built-in batteries
- Telecommunication terminal equipment powered by a telecommunication network
- Personal computers and auxiliary connected equipment.