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Ground coupling is a handy way to find the ground or zero volt level. Switching between ground coupling and DC coupling can be used to relate your DC coupled signal to ground. With modern digital oscilloscopes, the nominal ground level is typically displayed on screen. However, older analog scopes don't usually have this feature, so ground coupling becomes necessary.

For more information please see the Tektronix oscilloscope app note "XYZs of Oscilloscopes". Available free from Tek's website.

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