[Al (astral highway)]

Hi Peter,

I’m fine with a single device - pic shows some lovely waveforms from one such chip as well as the load of the power device. (So to emphasise, pic does not illustrate my query)

But when I’ve been looking at a pair of low and high side drivers together, I’ve blown up a few instantaneously, suggesting a shorted output that was not apparent. They’re pricey little things so I don’t want to repeat this finding.

There is I note a DC component and I realise I can - and do in the circiuit design that’s active outside the scope of the test - put a DC blocking capacitor either high or low side, but I’d ideally like to see the waveform before this.

I have in the past used an isolated power supply but I need something juicier to get the big pulses into a load that emulates the gate capacitance of a big IGBT half bridge.

My ‘scope has a plastic case and is double-insulated so I could take your advice and lift the earth connection for this purpose.