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Multimeter

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JeepMonkey:
The transformer itself does not convert AC to DC.  A transformer will either step up or step down voltage.  There is most likely a rectifier, possibly a wheatstone bridge, which will convert AC to DC.  A simple rectifier would be a bridge circuit consisting of four diodes.  Current will flow through the some of the diodes on the positive side of the AC wave, and flow through the some of the diodes on the negative side of the AC wave.  The result is a constant nonsinusoidal DC output to the load.

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