Electromagnetic interference (EMI) and electromagnetic compatibility (EMC) testing is crucial for ensuring electronic devices meet regulatory standards and do not interfere with others. Key components and equipment include various types of test chambers, antennas, spectrum analyzers, EMI receivers, signal generators, and testing software, each serving specific roles in radiated and conducted emissions and immunity testing. Additionally, utilizing accredited laboratories is essential for accurate results.

1. Key Components and Test Equipment for EMI/EMC
Testing
Electromagnetic Interference (EMI) and Electromagnetic Compatibility (EMC) testing are essential for
ensuring that electronic devices and systems meet regulatory requirements and can operate without
interfering with other devices. Several key components and test equipment are used in EMI/EMC
testing. These may include:
EMI Test Chambers:
Anechoic Chambers: These shielded rooms have special absorptive materials on their walls and ceilings
to eliminate external electromagnetic reflections, allowing for accurate testing.
Semi-anechoic Chambers: These chambers have absorptive materials on the walls and ceiling but may
have a conductive ground plane or other features for specific testing requirements.
Antennas:
Broadband Antennas: These are used to transmit and receive electromagnetic waves during testing.
 Horn Antennas: They are often used for radiated emissions testing.
 Biconical Antennas: Useful for radiated emissions and immunity testing.
 Log-Periodic Antennas: Ideal for wide-frequency range testing.
Spectrum Analyzers:
Used to measure the frequency and amplitude of electromagnetic emissions. They come in various
types, including swept-tuned and real-time spectrum analyzers.
EMI Receivers:
Specialized receivers designed for EMI testing, featuring sensitive receivers and various detectors (e.g.,
peak, quasi-peak) to assess emissions and immunity.
Signal Generators:
These instruments produce electromagnetic signals for radiated and conducted emissions testing.
EMI Probes:
Near-field probes are used to pinpoint the sources of EMI and assess emissions from specific
components on a PCB or in a system.
LISNs (Line Impedance Stabilization Networks):
Used for measuring conducted emissions on power and signal lines. They ensure a standardized
impedance for the device under test.
Current Probes:
Used to measure conducted emissions or susceptibility by monitoring current on cables or PCB traces.

2. TEM Cells (Transverse Electromagnetic Cells):
These are used for radiated immunity testing in a controlled and repeatable environment.
GTEM Cells (Gigahertz Transverse Electromagnetic Cells):
Used for broadband radiated immunity and emissions testing.
Power Meters and Log Periodic Antennas:
Used for conducted emissions testing.
ESD (Electrostatic Discharge) Generators:
Used to simulate electrostatic discharges to assess a device's susceptibility.
Surge Generators:
Used to simulate power surges or transients in power lines.
Immunity Test Generators:
These generate RF signals or electrical transients to test a device's immunity to external interference.
LISNs (Line Impedance Stabilization Networks):
Used for measuring conducted emissions on power and signal lines. They ensure a standardized
impedance for the device under test.
Test Software:
Software for controlling and automating the test equipment, as well as for analyzing and documenting
test results.
Calibration Equipment:
Necessary for ensuring that the test equipment is accurate and traceable to national standards.
Test Accessories:
Cables, adapters, attenuators, and other accessories required to connect and configure the test setup.
EMI/EMC testing involves a combination of radiated and conducted emissions testing, as well as
radiated and conducted immunity testing. The specific test equipment and components required will
vary depending on the testing standards and the device under evaluation. Additionally, the use of an
accredited test laboratory with experienced personnel is essential for obtaining accurate and reliable
test results.