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  Experimenter's Corner

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AC Current Test Source
By: Dave Johnson

 

With that resistor I can easily get up to 20 Amps of current.  So far, that has been high enough for me.  The shunt resistor allows me to use my multimeter to accurately measure the AC voltage across the resistor, which is then proportional to the AC current.  In most of my tests, the AC current is a loop.  I might use the loop to calibrate a current transformer or test the voltage drop through a power supply board.  Although I donít have a shunt resistor large enough, this same method could be used to produce much higher AC current.  I have seen setups similar to mine which can produce over 1000 Amps of AC current.
 

Toroidal Power Transformer Snap-on Current Transformer

Please send comments to me


Second Quarter,  2012    

 


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