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Conducted Measurements

Conducted measurements are test methods used to evaluate signals and interference transmitted through conductive paths such as power lines, signal cables, or RF connectors.

  • In EMC testing, they refer to the measurement of unwanted disturbances conducted on AC mains and signal lines, such as conducted emissions or immunity tests.

  • In RF testing, they describe the direct measurement of a device’s transmitted or received signals at antenna connectors or RF test ports, bypassing over-the-air propagation. These measurements are essential for demonstrating regulatory compliance under global frameworks such as FCC, CE (RED), ISED, and MIC.

Conducted EMC Testing

In the context of electromagnetic compatibility (EMC), conducted testing refers to the measurement of unwanted disturbances that travel through power or signal lines.

Typical application areas

  • Measurement of conducted emissions on AC or DC power lines

  • Verification of compliance with CISPR and EN standards for residential, commercial, and industrial environments

  • Certification of equipment under FCC Part 15.107 / 15.207, CISPR 11/22/32, EN 55032, EN 61000-6-3

Common measurement parameters

  • Conducted emissions (150 kHz – 30 MHz), measured in dBµV

Measurement setup

  • Line Impedance Stabilization Network (LISN) for coupling the DUT to the test system

  • Spectrum analyzer or EMI receiver for evaluation

  • Shielded environment to suppress ambient interference

Conducted RF Measurements

In RF testing, conducted measurements are used to directly characterize the signal at an antenna connector or RF port.

Typical application areas

  • Determination of RF output power for Wi-Fi, LTE, Bluetooth, and other transmitters

  • Measurement of modulation bandwidth and occupied bandwidth (OBW)

  • Detection of harmonics and spurious emissions at the RF port

  • Compliance with FCC §15.247, FCC §15.407, EN 300 328, ETSI EN 301 489-1/-3, MIC Japan

Common measurement parameters

  • Output power: measured in dBm

  • Occupied bandwidth / modulation bandwidth: measured in MHz

  • Harmonics and spurious emissions: measured in dBm or dBc

Measurement setup

  • RF test cables, attenuators, and matched loads

  • Spectrum analyzer or power meter for signal characterization

  • Shielded test environment to minimize external signals

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Last updated on September 16, 2025 by IBL-Editors Team Give feedback on this article

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