Radiated radio frequency emissions

The purpose of the test is to measure the amplitude of the electric field intensity (in V/m) of disturbance (radiated RF emission) emitted by the equipment and its connecting cables that could interfere with other equipment through electromagnetic coupling in the frequency range 30MHz - 6GHz, thus preventing the proper operation of telecommunications receivers.

The test requires the Equipment Under Test (EUT) to be positioned inside the semi-anechoic (or anechoic) chamber on a rotating table that allows for 360° rotation during the measurement. The test is conducted in the 30MHz to 6GHz band, using hybrid antennas (biconical and log-periodic) and horn antennas in the 1GHz-6GHz range.

During the test execution, the height of the antennas is varied from 1 m to 4 m for each polarization (horizontal and vertical), and the disturbances radiated by the EUT are recorded. This procedure is performed for each angular position of the table on which the EUT is placed. The measurement is managed via PC and dedicated software. The measurement (similarly to radiated immunity) takes place in a semi-anechoic chamber, whose metal walls (Faraday cage) prevent access to any external electromagnetic fields that could affect the measurement.

Furthermore, the ferrite tiles covering the internal walls of the chamber, combined with the absorptive cones, eliminate reflections (echoes) of electromagnetic waves on the walls. In this way, the only waves that can propagate are those from the device under test to the antenna.

emissioni radiate a radiofrequenza

The standards to be applied are:

EN 55016-2-3 (CISPR 16-2-3)
Specification for radio disturbance and immunity measuring apparatus and methods - Part 2-3: Methods of measurement of disturbances and immunity - Measurement of radiated disturbances. This standard specifies the test methodology and the equipment to be used.

Additionally, there are specific product standards depending on the Equipment Under Test (EUT), including, among others:

EN 55032
Electromagnetic compatibility of multimedia equipment - Emission standard for multimedia equipment.

EN 55011
Industrial, scientific, and medical (ISM) radio-frequency equipment - Radio disturbance characteristics - Limits and methods of measurement.

EN 55014-1
Electromagnetic compatibility - Requirements for household appliances, electric tools, and similar apparatus - Part 1: Emission.

EN 55011
Industrial, scientific, and medical (ISM) radio-frequency equipment - Radio disturbance characteristics - Limits and methods of measurement.

Alternatively, there are specific environmental standards to be applied in the absence of a product standard:

EN 61000-6-3
Electromagnetic compatibility (EMC) - Part 6-3: Generic standards - Emission standard for residential, commercial, and light-industrial environments.

EN 61000-6-4
Electromagnetic compatibility (EMC) - Part 6-4: Generic standards - Emission standard for industrial environments.

EN 61000-6-8
Electromagnetic compatibility (EMC) - Part 6-8: Generic standards - Emission standard for professional equipment intended for use in commercial and light-industrial environments.