Anechoic Chamber EMC Testing Standards for Automotive
Standards for electromagnetic compatibility (EMC) testing for automotive are mainly developed by IEC, CISPR, ISO and SAE. IEC, CISPR and ISO are organizations that develop and maintain international standards. SAE develops and maintains standards for use primarily in North America.
In addition to third party standards, manufacturers is also publishing their own standards. Some of these manufacturer standards refer to IEC, CISPR and ISO documents, which differ in scope or test levels. Mercedes, Renault, Ford, PSA, Nissan, General Motors, Volkswagen, BMW has published their own EMC requirements. If any company would like to sell their products to those brands, it shall fulfil manufacturer’s requirements, in addition to compliance with international standards.
There are two types of testing requires anechoic chamber:
* Radiated Immunity, ALSE method (ISO 11451-2)
* Radiated Emissions, ALSE method (CISPR 12, CISPR 25)
CISPR 25 and CISPR 12
The CISPR 25 is typically not used for regulatory purposes, but is commonly used by vehicle manufacturers to ensure good performance of vehicle-mounted receivers. If the radio installed in the vehicle, boat or other device does not perform reliably, consumer satisfaction and consequently product sales may be damaged.
Both CISPR 12 and CISPR 25 relate to vehicles operating on internal combustion engines (land-based vehicles), boats working with internal combustion engines (vehicles running on the water surface), and devices (but not necessarily) that work with internal combustion engines. for the transport of people). This latest category includes compressors, chainsaws, garden equipment and so on. It contains. CISPR 12 applies to all of these devices, as this may affect the performance of nearby (external) receivers. However, CISPR 25 should only be considered for products containing built-in receivers. For example, a chain saw with an internal combustion engine (but without built-in receivers) must meet the requirements of CISPR 12, but CISPR 25 does not use any built-in receiver for this saw.
CISPR 12 emitted emission measurements are made at 3-meter or 10-meter test distances. Measurements are normally made in an outdoor test area (OTS) or ALSE in an absorbent coated shield if the ALSE can be correlated with an OTS. Measurements can also be made for boats for water. The correlation of ALSE with an OTS has been a topic of discussion within the group of experts responsible for maintaining CISPR 12 over the past few years. The specification does not currently provide a method for obtaining this correlation. A working group is tasked with developing a method for associating ALSE with OTS; However, this may take more than a few years and we are expecting CISPR 12 then published in newer version.
What we offer?
We are offering EMC testing services, test systems and anechoic chambers for automotive industry. For more detailed information about EMC testing of vehicles or electronic sub assemblies used in automotive, contact us.
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