Meaning
Shielded enclosure lined with radio-frequency absorbing material isolates a device under test from external electromagnetic signals. The primary purpose of a radiated emissions chamber is to provide an environment free from ambient RF noise. This allows precise measurement of spurious electromagnetic radiation emitted by electronic products.
Electromagnetic Shielding
Metallic barriers block external signals like cellular and broadcast networks from entering the testing space. Inside the radiated emissions chamber, the lining absorbs internal reflections to create a free-space simulation. This absorption prevents standing waves from corrupting the measurement data.
Antenna Measurement
Calibrated measurement antenna operates at a fixed distance from the product being evaluated. As the test platform rotates, the receiving equipment in the radiated emissions chamber records the energy profile across different angles. This recording maps the directional distribution of the spurious emissions.
Engineers use automated software to scan multiple frequency bands, scanning from thirty megahertz up to several gigahertz to detect unauthorized transmission signals.
Validation Standard
Annual calibration verifies that the testing volume complies with international standards. By analyzing the site attenuation of the radiated emissions chamber, engineers ensure that measurements are reproducible. This validation is required before using the facility for official product certification.
