EMC Conducted Emissions Testing and Setup

EMC Conducted Emissions Testing and Setup


EMC Conducted Emissions Testing


Evaluate your DUTs line outputs (power and data) for compliance per FCC, UL, MIL-461, DO-160 and any other test standards. A conducted emissions test setup is done with a few pieces of equipment and can be accomplished quickly by a novice. Identifying and fixing the problem areas can be simple or difficult as many anomolies can contribute to test results. Having an appropriate test setup would ensure consistent and reliable measurements when evaluating your products conducted emissions. Commercial and industrial conducted emissions are performed to verify potentical harmful leakage between 150 kHz and 30 MHz. Aerospace and miltary standards extend the frequency requirements to 9 kHz and up to 400 MHz in some cases.

What are Conducted Emissions?

Conducted emissions are the noise components that are generated by a device or subcircuit and transferred to another device or subcircuit via cabling, PCB traces, power/ground planes, or parasitic capacitance. The conducted emissions that appear on the interface and power cables must be kept low or they can propagate through cables and reach other devices, causing problems to them.

Due to the recent developments in DC technology, the interconnections between DC and AC mains give rise to harmonic issues not previously experienced. Especially, the effects in DC power quality due to conducted emissions are not well understood. Moreover, the interconnections of AC and DC mains has given rise to further electromagnetic interference issues not previously known. Based on the current EMC standards, conducted emissions are measured from 150 kHz and 30 MHz, however there exists a gap in the electric power quality measured up to 2 kHz and the conducted emissions in the low frequency up to 150 kHz. The gap frequency range is termed Supraharmonics.

Getting Started

Identify Applicable Test Standards & Procedures

  • CISPR 11
  • CISPR 25
  • CISPR 32
  • FCC Part 15
  • FCC Part 18
  • MIL-STD 461
  • ANSI C63.4
  • DO-160
  • SAE J1113/41
  • IEC 61000-3-2
  • IEC 61000-3-3
  • ISO 7637-2

Considerations & Process

  • Identify relevant test standard/procedure
  • In lab or in place?
  • Determine test levels and coupling devices
  • Performance Criteria
  • Description of the EUT exercising method
  • Setup equipment and run calibration
  • Identify nearby and external contributors (if any)
  • Run test and identify problem areas
  • The recovery time of the EUT if necessary
  • Troubleshoot accordingly

Video - Conducted Emissions

Test Setup & Equipment

Popular Conducted Emissions Systems 

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