The engineer will clearly see, whether his changes improved or deteriorated the EMC performance or whether it remained unchanged. A set up with a TEM cell will not deliver exactly the same quantitative results as a measurement in a certified test house, however it will give an excellent indication on whether the design suffers from excessive radiated noise or not. Tekbox developed open TEM cells to cover the complete frequency range up to 2GHz and with usability even at frequencies beyond.Ĭombined with a spectrum analyzer, products can be tested before and after EMC related design modifications. A TEM cell is the right piece of equipment for desktop testing of radiated emissions. What is needed is an affordable laboratory set up to measure radiated emissions in the own lab, prior to compliance testing. Not only that re-testing costs are high, but also the project schedule and market introduction gets delayed. Anytime an engineer sends a new product for compliance testing, it is a shot in the dark. Nevertheless, it is estimated that > 50% of products fail testing first time around. Furthermore, it requires much space and the cost of the equipment for a standard conformant setup is immense.Īn engineer of a small or medium size enterprise usually has to rely on his experience and on best practice methods in order to design an EMC compliant product. Due to bandwidth limitations, several antennas are required to cover the complete frequency range. Radiated emission tests are typically carried out in anechoic chambers, using antennas to pick up the radiated signals.
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