The Role of Supply Conditions on the Measurement of High-Frequency Emissions

摘要: A standardized measurement procedure and source specification for laboratory high-frequency (HF, 2–150 kHz) emissions tests of low-voltage (LV) electronic equipment are still in development. To date, have been measured by direct supply from the mains network or a controllable power (PS), but both methods known to interfere with assessment process. line impedance stabilization (LISN) limits supply-load interactions has underevaluated until now HF analysis, despite being named potential approach IEC Standards. This article quantifies effect conditions on emission role LISN. The voltage fundamental amplitude low-frequency background distortion magnitude frequency characteristic is presented, new configuration combining programmable PS LISN proposed. Experimental results case study two LED lamps distinct emissions, representative number typical LV devices, indicate that only proposed PS+LISN can guarantee accurate repeatable measurements under separation needed ongoing standardization modeling activities.