Verification of suitability of the AAN shown in Fig. G.3 of CISPR 32 for conducted emission measurement on single and two-pair unscreened balanced cables

CISPR 32^[1]specifies several types of asymmetric artificial network (AAN) for conducted emission measurement on unscreened balanced pair cables. The AAN circuit diagram shown in Figure G.3 of CISPR 32^[1]is an example of a transformer-type-AAN, thought to be suitable for measurement on single, two, three and four unscreened balanced pairs even though EUT port of the AAN is a balanced four-pair connector. In this paper, we explain how we experimentally verified the suitability of this transformer-type-AAN by measuring common mode termination impedance and voltage division factor (VDF) while changing the balanced pairs to be measured. The results show that deviations among the measured values were sufficiently small and all measured values were met the requirements of CISPR 16-1-2^[2]. We concluded that this transformer-type-AAN is suitable for conducted emission measurement on any unscreened balanced pairs.