Products > Test Equipment
Problem with my scope? Reading positive versus negative average DC voltages.
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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