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Radiated Emissions

Radiated Emissions

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Radiated emissions will most likely be your highest risk when performing compliance testing at the test facility. With all the high-speed digital circuitry inside electronic products today, it becomes all too easy for harmonics of the clock frequencies and other fast-edged devices to radiate EM fields. Typically, failure modes will be cable radiation or leakage from enclosure seams or apertures. This handy checklist can be used either as a pretest check prior to compliance testing or as a check following a test failure.

Chapter Contents:

  • 4.1 Introduction to Radiated Emissions
  • 4.2 Radiated Emissions Checklist
  • 4.3 Typical Failure Modes
  • 4.4 Troubleshooting Emissions at the Test Lab
  • 4.5 Troubleshooting at Your Facility
  • 4.5.1 Clock Oscillators
  • 4.5.2 Identification of Emissions
  • 4.5.3 Power Line Emissions
  • 4.5.4 Filters
  • 4.5.5 Capacitors
  • 4.5.6 Ferrite Chokes
  • 4.5.7 Shields
  • 4.6 Commercial Testing Issues
  • 4.7 DIY Tricks and Low-Cost Tools
  • 4.7.1 Near-Field Probes
  • 4.7.2 Current Probes
  • 4.7.3 Chassis Bond Measurement
  • 4.7.4 Connector Bonding
  • 4.8 Typical Fixes
  • 4.8.1 Wires and Cables
  • References

Inspec keywords: electromagnetic waves; digital circuits

Other keywords: electronic product; test facility; EM field radiation; high-speed digital circuitry; cable radiation; radiated emission

Subjects: Electromagnetic waves, antennas and propagation; Electromagnetic waves: theory

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