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-- Connect a diode and small resistor in series across a source of AC.

-- Using the point where the diode and resistor meet as a common point, connect

one scope probe (H or V) to the far end of the resistor, and the other scope probe

to the far end of the diode.

-- One dimension of the scope display now corresponds to the voltage across the diode.

-- Since the voltage across the resistor corresponds to the current through it,

the other dimension of the display corresponds to the diode current.

-- I leave you to work out the scale factor for the current, and the various polarities.

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