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kalee20 · 10th Jul 2018, 7:14 pm

Why not? It's how I've always done it!

Only when the gate drive is NOT ground-referenced do you have a problem. In that case, you might be able to get away with floating the scope (isolation transformer), or floating the circuit-under-test (power it from a battery). Or use a differential input, as long as you don't exceed the common-mode range.

When you are confident that the gate drive circuit is good, with clean fast edges, you can monitor it for pulse-width etc with a little temporary ferrite-cored transformer (capacitively coupled if necessary)

10th Jul 2018, 7:14 pm	#2
kalee20 Dekatron Join Date: Feb 2007 Location: Lynton, N. Devon, UK. Posts: 7,082	Re: Gate drive/ (r) 'scope measurements Why not? It's how I've always done it! Only when the gate drive is NOT ground-referenced do you have a problem. In that case, you might be able to get away with floating the scope (isolation transformer), or floating the circuit-under-test (power it from a battery). Or use a differential input, as long as you don't exceed the common-mode range. When you are confident that the gate drive circuit is good, with clean fast edges, you can monitor it for pulse-width etc with a little temporary ferrite-cored transformer (capacitively coupled if necessary)