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Problem with my scope? Reading positive versus negative average DC voltages.

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Fungus:

--- Quote from: wobbly on September 25, 2024, 07:36:30 am ---I just tried this experiment at work (with completely different equipment) and got almost the exact same result!

If that's just the way I things are then so be it!

--- End quote ---

It really is...  :)

tautech:

--- Quote from: tautech on September 25, 2024, 07:11:02 am ---
--- Quote from: Fungus on September 25, 2024, 06:02:30 am ---
--- Quote from: tautech on September 25, 2024, 02:03:29 am ---0.5V over 20V is far more than one would expect from channel crosstalk but within accuracy spec.

--- End quote ---

Yeah, I guess.

The next question would be does the reading change on a channel between when they're both connected to +10V and you connect the other channel to ground, not -10V.

--- End quote ---
Revisiting the OP, what one thing has the OP not done ?
 :popcorn:

--- End quote ---
Not worked it out yet ?

Fungus:
Self-cal?

Aldo22:
With my cheap scopes I have found that the positive DC measurement is quite good (definitely within 3%, usually better) but negative DC polarities can be off by 5-6%.
Is this a general observation or is it a “special feature” of cheap scopes?

Yes, I know, scopes are not made for that...  ;)

Phil1977:
And please check if the voltage levels change when playing with the trigger settings. I´ve seen it for too often that Auto-mode was expected to be free-running but was in phase with something unexpected. This exactly looks like a DC-offset and would affect the "average full screen" in the same way.

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