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Radiated Emission Test
Meaning
Laboratory procedure measuring the electromagnetic energy that escapes from an electronic device into the surrounding air. Every product containing a high speed clock or a radio must undergo this assessment to ensure it does not interfere with other equipment. The radiated emission test captures both intentional transmissions and the unintentional noise generated by internal circuitry.
Measurement Environment
An anechoic chamber provides a controlled space free from outside radio signals and internal reflections. During a radiated emission test, a calibrated antenna moves around the device at a specific distance to find the orientation of maximum energy leakage. The walls of the chamber absorb signals to ensure that only the direct radiation from the product is recorded.
Frequency Range
Scanners sweep through a wide spectrum of radio waves to identify spikes in power. The radiated emission test typically covers frequencies from thirty megahertz up to several gigahertz depending on the highest internal clock frequency of the board. Engineers compare these results against the limits defined by regulators like the FCC or the European Union.
Failure Mode
Excessive noise often originates from poor grounding or inadequate shielding in the enclosure design. If a radiated emission test reveals a peak above the legal limit, the manufacturer must add filters or redesign the traces on the printed circuit board. Passing this test is a mandatory step for obtaining the right to sell the product.