Unintentional radiation of electromagnetic waves caused by deterioration of metal halide lamps

摘要

In this paper, unintentional radiation from damaged metal-halide lamps was measured and analyzed through the EMC measurement and Amplitude Probability Distribution (APD) measurement. The noise caused by glow or arc discharge shows characteristics of impulse. The unintentional noise exceeds the standard limits of radiation emission and conducted emission in CISPR 15 and the results are up to 49.06 dBuV/m and 47.8 dBuV, respectively. Due to the instability, frequency characteristics of the noise were not measured accurately. The frequency characteristics of impulse noise were measured with APD. The results show that 94.2 % of electromagnetic radiation of over 60 dBuV/m was converged ranging from 30 MHz to 200 MHz.