CISPR
The Comité International Spécial des Perturbations Radioélectriques (CISPR; English: International Special Committee on Radio Interference) was founded in 1934 to set standards for controlling electromagnetic interference in electrical and electronic devices, and is a part of the International Electrotechnical Commission (IEC).
Organization
CISPR is composed of six subcommittees, each responsible for a different area, defined as:
- A - Measurement of radio interference and statistical methods
- B - Measurement of interference regarding industrial, scientific or medical (ISM) equipment, high voltage equipment, power lines, or traction devices
- D - Interference in motor vehicles (both gasoline and electric)
- F - Interference in household appliances, tools, and lighting equipment
- H - Limitations to protect radio frequencies
- I - Electromagnetic compatibility of information technology (IT) equipment (e.g. computers), multimedia / hi-fi devices and radio equipment (receivers)
Technical standards
CISPR's standards cover the measurement of radiated and conducted interference. EMI test results can vary widely according to the exact layout of the equipment and cabling. CISPR set various standards for the test layout, to help improve the reliability of comparison between tests. These standards cover cable lengths, measurement device configuration and grounding schemes. The standards also address immunity from external interference.
When purchasing equipment, a company or organization can require compliance to one or more CISPR standards from the supplier.
CISPR have published over thirty standards to date. Some of the more important include:
- CISPR 10 - Organization, Rules and Procedures of the CISPR. (1971)
- CISPR 11 - Industrial, Scientific and Medical (ISM) Equipment -- Radio-Frequency Disturbance Characteristics -- Limits and Methods of Measurement.
- CISPR 12 - Vehicles, boats, and internal combustion engine driven devices -radio disturbance characteristics -limits and methods of measurement
- CISPR 14 - Electromagnetic Compatibility -- Requirements for Household Appliance, Electric Tools, and Similar Apparatus: 1) Emissions, 2) Immunity.
- CISPR 15 - Limits and methods of measurement of radio disturbance characteristics of Electrical lighting and similar equipment.
- CISPR 22 - Information Technology Equipment—Radio Disturbance Characteristics—Limits and Methods of Measurement.
- CISPR 24 - Information Technology Equipment—Immunity characteristics—Limits and Methods of Measurement.
- CISPR 25 - Radio disturbance characteristics for the protection of receivers used on board vehicles, boats, and on devices—Limits and Methods of Measurement. [1]
Application
Depending on the market, CISPR's standards are a benchmark or goal for suppliers to reach either to meet OEM requirements or as a product feature. For example, in the automotive electronic market, CISPR 25 is an increasingly popular benchmark and requirement for body electronics. Electronic suppliers have become increasingly focused on proving that their devices can meet CISPR 25, for example Texas Instruments has been releasing reference designs that prove one or more devices can meet the standard if used in a design correctly.[2]