University of Hertfordshire

Measurement uncertainty and cable balance - With implications for the CDNE-M and CMAD

Research output: Chapter in Book/Report/Conference proceedingConference contribution

  • David M. Lauder
  • Richard C. Marshall
View graph of relations
Original languageEnglish
Title of host publicationProcs 2014 Int Symposium on Electromagnetic Compatibility (EMC Europe)
Number of pages6
ISBN (Print)9781479932252
Publication statusPublished - 20 Oct 2014
Event2014 International Symposium on Electromagnetic Compatibility, EMC Europe 2014 - Gothenburg, Sweden
Duration: 1 Sep 20144 Sep 2014


Conference2014 International Symposium on Electromagnetic Compatibility, EMC Europe 2014


The emulation of the real-world of mains power cables in EMC test methods can be improved. We show that for devices with significant differential-mode emission in the frequency range 150 kHz to 30 MHz, the impedance balance of the mains cable should be specified, even when the actual measurement is of data cable emission. For the same reasons radiated emission testing between 30 MHz and 200 MHz may be seriously in error. Neither the proposed CDNE-M (Coupler Decoupler Network for Emission - Mains) or the CMAD (Common-Mode Attenuation Device) captures the real-world interference due to DM because they do not model the DM to CM conversion and reflection at points remote from the EUT. It is recommended that the development of Standards should assume that one-tenth of mains-cable DM is converted to CM. An appropriate small modification to the CDNE-M design is presented.

ID: 9255371