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Radiation Emission - CDNE

1. Introduction to the test

　　For some electrical lighting equipment: the internal operating frequency must be ≤30MHz, and the product size should be less than 3m*1m*1m (length, width and height). The CISPR 15 standard stipulates that the coupling/decoupling network (CDNE) method is an alternative to the radiated emission measurement method. Using CDNE to measure the common mode terminal voltage can shorten the test time and save the cost of the site.
　　The principle of the CDNE method is that for a small EUT, the radiation emission caused by the common mode current on the lead is far greater than the outward radiation from the surface of the test object. Since CDNs provide stable common-mode impedance, radiated emissions can be deduced by measuring the common-mode voltage. The CDNE method can measure the frequency range from 30MHz to 300MHz.
　　The lighting equipment is placed on a non-conductive wooden board with a height of 10cm, and the wooden board is placed on a grounded metal plate. The lighting equipment is connected to the CDNE through a power line about 20cm long. The distance between the cable and the metal plate is 3~4cm.

2. System connection diagram

3. Typical configuration

Radiation-CDNE Alternative Method Test System
serial number	product	illustrate	brand
1	ESR3	EMI fully compatible test receiver, frequency range 9 kHz~3.6GHz	Rohde&Schwarz/Germany
2	EMC32	EMI measurement software for civilian and military standards, with hardware protection dog	Rohde&Schwarz/Germany
3	CDNE M2	CDNE 2-wire for CISPR15 emission measurements, also available as CDNE AF2	Schwarzbeck/Germany
4	CDNE M3	CDNE three-wire for CISPR15 emission measurement	Schwarzbeck/Germany
5	SR	Shielded room, size can be customized according to customer site	Frankonia/Germany

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