Hi all,
The PSE mark (inside a diamond shape) for Japan does not apply to IT equipment
that has an internal power supply. For IT equipment with an external power
supply, only the external power supply must have the PSE mark. The category "A"
list of items for "Electrical Appliances and Materials
So far... it seems that the impedance of the lab bench source drops the voltage
below what will sustain the arc across the short circuit of the breakdown. And
so the waveform looks like a spark gap or lightning. Lots of on and offs in
quick succession. ps. we had to use 'reinforced' fuses in
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