These are often reserved ahead of time through a third-party group. In general, compliance testing is a formal process due to the anechoic chamber, as most electronic device manufacturers do not have an in-house chamber. The key difference between pre-compliance and compliance testing is the formality and the usage of an anechoic chamber, as seen in the image below.Īn anechoic chamber is a room designed to absorb reflection of electromagnetic waves - which is perfect for performing tests on an electronic device to ensure there is not any unexpected interference. Proper pre-compliance testing is crucial if you want to save money and avoid surprises during compliance testing. The cost of compliance testing includes reserving time in the compliance lab and redesigning your DUT if it does not pass compliance. Waiting until the end of a product development cycle for compliance testing is risky due to its high cost. Pre-compliance is a low-risk, cost-effective method to ensure your device under test (DUT) will pass final compliance testing. Immunity- The property of a receiver or any other equipment or system which enables it to reject a radio disturbance.Radiation- The emissions of energy in the form of electromagnetic waves.Anechoic Chamber – A shielded room, designed to absorb sounds or electromagnetic waves and reduce reflections from all internal surfaces.LISN – Line Impedance Stabilization Networks - The LISN is important because it isolates power mains from the DUT, which needs to have as clean a signal as possible.CISPR- International Special Committee on Radio Interference which sets standards to supervise electromagnetic interference in electrical and electronic devices.
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