Modified Sine Wave HORROR! This is what I got off an inverter with a bad output filter. I believe this is proof of why you should invest in a true sine wave inverter if you’re running anything other than lighting and a refrigerator (note: a refrigerator with electromechanical controls — not an electronic control system.)
No, the scope isn’t lying here… see the last pic…
I almost missed this because I had a resistive load on the inverter. Apply a resistive load and it looks like this. Apply an inductive load and it still has those ugly spikes.
They really are that bad.
Set to trigger on the very start of one of those negative pulses. What you’re looking at is essentially a DC offset of -170vdc… with THAT on top of it. YES, THAT IS 200 VOLTS/DIV. HOLY ASS, BATMAN.