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difference between VDD-GND(+) and GND-VDD(-) in ESD HBM test

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frankaurora

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vdd gnd

hi,all

In one ESD HBM test report,VDD-GND(+) pass 8kV while GND-VDD(-) fail at 4kV;
But I think the two test mode have equivalent ESD discharge path and mechanism, and test result should also be the same;
anyone have idea about the difference between them?

Thanks in advance.

ESD schematic:
 

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