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How do I get my oscilloscope to read voltage correctly? (lemmy.world)

submitted 3 days ago* (last edited 3 days ago) by PriorityMotif@lemmy.world to c/askelectronics@discuss.tchncs.de

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I bought a cheap Hantek 6022BE to learn with and I'm just trying to measure some voltage to check if it's accurate. I'm using openhantek6022 https://github.com/OpenHantek/OpenHantek6022 and also hscope on android. I'm measuring a 19v laptop power supply with the 10x setting on the probe and also a set of leads with a 20x attenuator. When I measure the power supply with my dmm I'm getting 19.22V with the scope I'm getting much higher or lower depending on where I set the voltage per division. Both programs have a calibration function which I did.

20x attenuator showing 19.6v

10x probe showing 20v

10x probe with 2v per division setting only showing 9.81V

Hscope showing 19.9v

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[–] glibg10b@lemmy.ml 4 points 3 days ago* (last edited 3 days ago)

10x probe with 2v per division setting only showing 9.81V

The scope is clipping (limiting the voltage to protect the internal ADC). Notice CH1 in the bottom left is red. You can fix this by increasing the voltage scale

The OpenHantek6022 manual describes the limits of each voltage scale setting

Edit: I have exactly the same scope. If you need any help, you can reach out to me