Several cheap Inverters and some very odd Oscilloscope sine wave results - Please help me identify

nsaspook

Joined Aug 27, 2009
13,079
True. I'm not going to make YouTube channel quality videos to ask a simple question.
I hear those high quality YT presentations are quite labor intensive.

Thank you so much for the assist.

I have to respectfully disagree with your statement above, however because the evidence points to me having superior test cables,
That alone could easily account for the noise and other differences. Also, the measurements seem to be fine.....it's the interpretation that I lack. Hitachi knew what they were doing. Me? Meh, it's just an occasional interest.

The reference to phasing possibly causing the shifting sine wave seems helpful.
I'll look into that.
The likely interpretation of what you have shown is hindered by bad signals likely caused by poor connections (grounding?) of the test equipment and/or defective test equipment (Hitachi) not superior test cables.

You can use a little mains step-down transformer, say 120/12 or so to isolate the inverter signal for o-scope display from the normal AC load and eliminate possible grounding issues. The unloaded transformer won't visibility the waveform too much.
 
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