ESD waveforms from different ESD Generators (simulator)
Correlation between ESD current, ESD field and ESD susceptibility
For the same electronic equipment at the same point, there should be definite ESD susceptibility failure level voltage. But different ESD generators from different manufactures have different failure level voltage even all the ESD generator's are in compliance with the IEC61000-4-2 standard. Some ESD generators just 1kV and others even 6kV for the same equipment. Why and which is better? Any dealer will not tell you the truth but this site www.ESD-china.com
IEC61000-4-2 Standard ESD current waveform Real ESD current waveform (smooth decay )
Some real ESD current waveform (decay too quick and then ring ) Very large ring decay
Some simulators produce waveforms that are in compliance with IEC 61000-4-2, but have considerable ringing and high frequency components. These simulators may cause failures in products which would not occur in the same discharge voltage in real ESD.
ESD current waveshape in the firs several (0-9 nanoseconds) (smooth decay )
Dr.Huang in the EMC lab
ESD induced voltage and discharge current waveform
Nine different ESD generators from different manufactures have different failure level for the same equipment.
Some ESD generators just 1kV and others even 6kV to make the same equipment to failure
Reference:
1. Jiusheng Huang, ESD Test Report, EMC lab, UMR, Nov.2002
2 “Investigation of ESD Current and Induced Voltage from Different ESD Simulators” , Proceeding of ESA-IEEE Joint Annual Meetings, Little Rock, Arkansas, USA. June. 24-28, 2003 http://www.esd-china.com/ESD/Jshuang/papers.htm
3 “Electromagnetic Field Generated by Transient Electrostatic Discharges (ESD) from Person Charged with Low Electrostatic Voltage,” Electrical Overstress/Electrostatic Discharge Symposium Proceedings, pp.415-418, Portland, Oregon, USA. Sep. 10-14, 2001