Hi all. I want to use my scope to measure output power of a class D amp. It has floating outputs. I'll obviously have to un-ground my scope as I dont have a diiff probe. BUT, thats ok. My main problem is the high freq riding on top of the inputted sine wave. Anyone have a nice filter circuit to get rid of this?
You might try the Class D amplifier forum where trevmar has a load of relevant threads, references to papers, tutorials etc. and may be in a position to make suggestions from his experience.
If your scope is a dual channel and you have two probes, you can do your job without un-grounding your scope
Have the scope in Ch1-Ch2 mode (A-B mode).
Adjust for equal sensitivity (V/div) of both channels .
Use the hot bit of the probes only and remove the ground clips off them (or have them connected with each other, but take care for not let them touch anything on the probed circuit).
You may have to invert one channel by pressing the INV button.
George
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