Frequency Ranges & CE Standards

Conducted testing occupies a narrow but critical slice of the spectrum, and which standard applies depends entirely on the product's market and industry. This module zooms into that frequency window and walks through the seven standards you're most likely to encounter.

Most commercial conducted-emission testing covers 150 kHz to 30 MHz, sitting inside a broader EMC spectrum that runs from 9 kHz up to 300 MHz and beyond (where radiated testing takes over). Below 150 kHz, conducted limits are less commonly imposed on commercial products but do appear in military and some international standards down to 9 kHz.

Interactive: Zoomable EMC Spectrum

The highlighted band is the conducted testing range. Drag the range slider to zoom into different parts of the spectrum.

9 kHz–300 MHz 150 kHz–30 MHz

Why 150 kHz–30 MHz? Below 150 kHz, most switching converter fundamentals and their earliest harmonics simply haven't started, and mains-frequency artifacts dominate. Above 30 MHz, cables become electrically long enough relative to wavelength that energy starts radiating more efficiently than it conducts, so testing shifts to the radiated methods covered in the RE course.

Click a standard to see its frequency range, detector, and typical application.

KNOWLEDGE CHECK

Module 3 Quiz

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