Summary
2019 Joint International Symposium on Electromagnetic Compatibility and Asia-Pacific International Symposium on Electromagnetic Compatibility, Sapporo
2019
Session Number:WedPM1C
Session:
Number:WedPM1C.2
Further Effects of Test Voltages, Relative Humidity and Temperature on Air Discharge Currents from Electrostatic Discharge Generator
Takeshi Ishida, Osamu Fujiwara,
pp.-
Publication Date:2016/10/5
Online ISSN:2188-5079
DOI:10.34385/proc.58.WedPM1C.2
Summary:
Air discharge immunity testing is specified in IEC 61000-4-2 under the climatic conditions of relative humidity from 30 to 60 % and temperature from 15 to 35 ??C. This implies that the air discharge testing is likely to provide significantly different test results due to a wide climate range. We previously measured air discharge currents with test voltages from 2 kV to 15kV at an approach speed of 80 mm/s under 6 combinations of relative humidity and temperature in the IEC specified and non-specified climate range. The result showed that the same absolute humidity provides almost the identical waveforms of the discharge currents despite different relative humidity and temperature, and also that the current peaks at higher test voltages decrease as the absolute humidity increases. We further examine the effects of air discharges on test voltages, relative humidity and temperature with respect to two different approach speeds of 80 mm/s and 20 mm/s. As a result, the approach speed of 80 mm/s is confirmed to provide the same results as the previous ones under the identical climate conditions, while at a test voltage of 15 kV in the IEC specified climate range 20 mm/s approach speed causes the current waveforms entirely different from those at 80 mm/s despite the same absolute humidity, and the peaks are not affected by the absolute humidity, however, under the IEC non-specified climate conditions, likewise the case at 80 mm/s, the peaks decrease at higher test voltages.