Alternative conducted emission measurements for industry

Alternative conducted emission measurements on mains without LISNs

“…Besides, in the equations, the CM and DM voltages/currents are stated with only CM and DM subscripts without "REF" in order to emphasize that these are industrial currents not the reference one of the laboratory environment. Finally, all the impedance measurements lead to correction factors between the reference emission setup with the reference LISN and the alternative setup without the reference LISN as given in equations (9) -(12) with the assumption that CM and DM interference voltage sources inside the EUT are constant [6].…”

“…Finally, a good work on alternative methods is accomplished in [5] where, in addition to direct measurement methods, an indirect method based on the circuit models was introduced in time domain. In [6], we have established the fundamentals of conducted emission tests based on the impedance measurements of the EUT, supply and used mains cable by using two-probe approach. Although there are some methods for impedance measurements in the literature, we chose the two current probe method stated in [7] for our method.…”

“…We began with firstly establishing the common mode and differential mode circuit models to use the measured impedances of the EUT, used cables and the supply. For that purpose, in [6] we utilized the RF port of a signal generator as an EUT along with a commercial reference source and tested them under the reference conditions installed with two LISNs as stipulated by the standards and also under the unknown mains conditions installed with different connection of LISNs. In [6], LISNs connected in parallel for phase in various numbers and also for neutral were used as the unknown mains that simulate an industrial environment.…”

“…For that purpose, in [6] we utilized the RF port of a signal generator as an EUT along with a commercial reference source and tested them under the reference conditions installed with two LISNs as stipulated by the standards and also under the unknown mains conditions installed with different connection of LISNs. In [6], LISNs connected in parallel for phase in various numbers and also for neutral were used as the unknown mains that simulate an industrial environment. The main reason for simulating the mains by using various numbers of LISNs in parallel is to form ideal mains with stable impedance and without any resonances but very different from the reference LISN impedance.…”

“…In this paper, we did not only use the mains simulations installed with different connection of LISNs like we used in [6], but also we also show how to use actual 220V mains without using any LISN. Moreover, we tested actual EUTs such as a drill, a UPS (Uninterruptable Power Supply) in addition to 220V reference source on mains simulations and also on actual mains, and compared theoretical correction factors with experimental correction factors to validate the alternative method based on the impedance measurements.…”