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Oscilloscope grounding information (OP AMP)?
I was doing a practical experiment at college, proving theory with the operation of an operational amplifier, and I accidently grounded the oscilloscope twice which resulted in the negative cycle of the output sinewave being coloured completely in black. When I took off one of the grounds it displayed a normal sinewave again.
What is this called and what causes it please?
EDIT: sorry I mean I had two sets of leads measuring input on 1 channel and output on the 2nd channel and I grounded them both. If that helps.
Most oscilloscopes have their ground lead connected to the mains ground. Your DC power supply for your experiment may also have had one side connected to the mains ground. When you clip your oscilloscopes ground lead to the circuit then you short out some part of your circuit. You can get around this by using two channels on your scope: connect the ground clip of both together and leave it 'floating' and clip one probe to where you want to measure, then the other to your circuit or measuremnts ground. Then set your oscilloscope to display the difference between the two inputs.
Also remember usually the ground of each input on the oscilloscope is the same, they are connected internally to mains ground. So you cannot take two measurements simultaneously with two seperate grounds (i.e. on floating with respect to the other).
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