New TESEQ CDNE Coupling/Decoupling Network for Emission Testing

Teseq, a leading developer and provider of instrumentation and systems for EMC emission and immunity testing, has developed a new coupling/decoupling (CDNE) network for emissions testing.
The publication of EN 55015, based on CISPR 15 A1 Ed 7, has introduced an independent method of measurement of radio disturbance characteristics of electrical lighting equipment. This method specifies the use of a coupling/decoupling network (CDN) as defined in IEC 61000-4-6 for emission measurement in the frequency range 30 to 300 MHz.

An analysis of results of testing with existing CDN designs showed the need for closer CDN impedance tolerances. A standard working group was founded for improving the CDN design and for transferring the new emissions measuring equipment requirements to CISPR 16-1-2 and methods to CISPR 16-2-1.
The result describes a specific coupling/decoupling network for emissions (CDNE). In addition to closer tolerances for the asymmetrical impedance, the phase angle, symmetrical impedance and the internal attenuation are also defined.