EMC testing of electronic sub-assemblies (ESAs)
The requirements of the directive for electronic (electrical) sub-assemblies (ESA) is based on what those products may be exposed to in normal use in terms of electromagnetic radiation. The overriding objective is to ensure that the electronic sub-assembly remains safe and does not cause interference. The following flow chart provides a decision tree of what is included within the scope of the directive and what is not.
After following the above flow diagram and confirming that the Automotive EMC Directive is the right directive to apply (i.e. CE marking may be more appropriate if there is no immunity related function of the product) then the tests need to be performed.
The tests performed are typically as follows:
- Broadband and narrowband disturbances (Radiated emissions)
- Conducted disturbances
- Radiated electromagnetic immunity
- Transient immunity
All of these tests are typically performed in a shielded EMC chamber with the electronic sub-assembly mounted on a table top. During the tests the ESA's are monitored to ensure that the performance is not degraded with the application of the phenomena.
We are able to carry out EMC test on all electronic / electrical sub-assemblies fitted to vehicles and can accommodate small components to whole sub systems. This variety is important when looking at military platforms which may be very large and complex.
