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EMC Engineering: Easy-to-Perform EMC Precompliance Testing and Troubleshooting



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Tests

  • Analyze/measure crystal oscillator harmonics
  • E- and H-field probing
    • PCBs (printed circuit boards) E- and H-field probes
    • Cables (current probes)
    • Shields (surface current and 4-point probes)
  • Measure bare PCB (printed circuit board) emissions
  • Measure induced or conducted emissions in cables
  • Shielding (and shield-effectiveness) tests (see below)

Compact Harmonic Comb Generator Used for Shielding-Effectiveness Test

  • May be put inside a product. Useful for shielding-effectiveness measurements.
  • Step-recovery diode circuit produces 5 MHz harmonics from 30 to 1500 MHz.
  • Powered by 9 Volt battery

       

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First ... Comb Generator Taped to Prototype Product

Next … Comb Generator is Measured by Itself

Finally...Shielding Effectiveness Plot is the Difference (between the above two tests)

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EMC Testing | Environmental Testing | Vibration Testing

Updated: Wednesday, 2007-10-03 1:44 PST