| Products > Test Equipment |
| Problem with my scope? Reading positive versus negative average DC voltages. |
| << < (5/6) > >> |
| 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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