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Monitoring Electric Field Strengths for Radiated Immunity Testing

Radiated immunity testing is an essential part of evaluating electronic devices' ability to withstand electromagnetic interference (EMI). To ensure accurate and reliable testing, monitoring the electric field strengths in the test environment is crucial. This web page provides an overview of monitoring electric field strengths in GTEMs (Gigahertz Transverse Electro-Magnetic) chambers, anechoic chambers, and other RF rooms.

GTEM Chambers

GTEM chambers are widely used for radiated immunity testing due to their ability to generate uniform electric fields over a wide frequency range. Monitoring the electric field strengths in GTEM chambers involves:

  • Calibrating field probes and sensors to measure electric field strengths accurately.
  • Positioning the probes at specific locations within the chamber to capture representative field strengths.
  • Using specialized equipment such as spectrum analyzers or field strength meters to record and analyze the measured values.
  • Performing regular checks and calibrations to ensure measurement accuracy over time.

Anechoic Chambers

Anechoic chambers provide a controlled electromagnetic environment with minimal reflection. Monitoring electric field strengths in anechoic chambers involves similar steps as in GTEM chambers, but with some additional considerations:

  • Accounting for the anechoic chamber's absorptive materials, which may affect the field distribution and measurement accuracy.
  • Ensuring proper grounding and isolation techniques to minimize interference from external sources.

Other RF Rooms

RF rooms encompass a broad category of test environments, including semi-anechoic chambers, shielded rooms, and open-area test sites (OATS). Monitoring electric field strengths in these rooms requires tailored approaches depending on the specific setup and requirements. Key considerations include:

  • Understanding the particular field distribution characteristics within the room.
  • Selecting appropriate measurement techniques and equipment based on the frequency range and field strength levels.
  • Considering potential interference sources within the room and implementing mitigation measures.


Monitoring electric field strengths in GTEMs, anechoic chambers, and other RF rooms is essential for accurate radiated immunity testing. Proper calibration, probe placement, and equipment selection are crucial for obtaining reliable measurements. By maintaining a well-monitored test environment, researchers