Radiated Emission
 

​The radiated emission test procedure is a crucial aspect of ensuring the electromagnetic compatibility of electronic devices. This test aims to assess the amount of electromagnetic energy emitted from the device and ensure that it complies with regulatory standards.

​To conduct this test, a specialized anechoic chamber is utilized to minimize external interference and accurately measure the emitted electromagnetic energy. The device under test is placed on a turntable to evaluate emissions in various directions.

During the test, the emissions are measured across different frequency ranges to identify any potential issues. The test procedure also involves modulating the device's signals to simulate real-life usage scenarios and assess its emissions under different operating conditions.​

Additionally, the test setup includes antennas positioned at specific distances from the device to measure the radiated emissions effectively. The results are then compared against regulatory limits to determine compliance.

Overall, the radiated emission test procedure is meticulous and comprehensive, playing a pivotal role in ensuring the reliability and safety of electronic devices in their electromagnetic environment.

​Test Setup

 

Test Equipment​

• Anechoic Chamber (SAC/FAR/OATS)

• EMI Receiver or Spectrum Analyzer

• Antenna (Frequency dependent from 9kHz to 40GHz)

• RF Cable
   

Test Parameters

Frequency Range: 9kHz 40GHz (Test Frequency depends on the applicable product standard)

Measurement Parameters: Peak, Quasi-Peak and Average (Generally RE can be measured with Quasi-peak detector but few standard has requirement of Peak and Average detector also).

Antenna Height: 1m to 4m (Antenna needs to be varied from 1m to 4m height to capture the emission at all possible heights).

Antenna Polarization: Vertical and Horizontal

EUT Rotation: 0° to 360° (Equipment under test needs to rotate 0 to 360deg to make sure emission captured from all possible directions)
 

Radiated Emission Measurement

1. Setup EUT at designated place inside the SAC/FAR and powered on as per EUT's Rating.

2. Set Receiving Antenna on Antenna Mast to capture emission at varying height (1 to 4 meter).

3. Connect RF cable from Antenna to EMI Receiver/Spectrum Analyzer to measure the Emission coming from EUT.

4. Set the Test frequency and Limit Lines as per applicable standard in the Receiver and start the scan.

5. Rotate turn table from 0° to 360° and raise height from 1m to 4m in both Horizontal and Vertical Polarization to capture the Emission from all possible directions of the EUT.

6. Record the Results to mention in the test report.