Summary
International Symposium on Electromagnetic Compatibility
2009
Session Number:23S3
Session:
Number:23S3-2
Measurement of Induced Voltages on Simple Printed Circuit Board Due to Indirect Discharges of ESD Generators
N. Yamamoto, Y. Taka, O. Fujiwara,
pp.697-700
Publication Date:2009/7/20
Online ISSN:2188-5079
Summary:
The International Electro-technical Commission (IEC) prescribes immunity tests (IEC610000-4-2) of electronic equipment against electrostatic discharges (ESDs), and specifies indirect discharges of an ESD-gun to a vertical coupling plane (VCP) in the vicinity of equipment under test (EUT) that simulate personnel discharges to conductive materials adjacent to the EUT. According to IEC 61000-4-2 2001-04, the VCP shall be placed parallel to the EUT at a distance of 0.1m from the EUT, while the discharge shall be applied to the centre of one vertical edge of the VCP without specifying any angles of inclination and rotation of the ESD-gun to the VCP, and a reference position of an EUT to the VCP as well. In order to examine to what extent the above discharges affect the results, using a simple printed circuit board (PCB) with a trace in lieu of EUT, we measured the voltages induced on the trace due to indirect discharges with different angles of inclination and rotation of an ESD gun to the VCP. As a result, we found that the induced peak voltages greatly vary by a factor of 1.96 with respect to angles of inclination and rotation of an ESD gun onto the VCP.