View Full Version : watt ,voltage & amp sensor

03-28-2007, 11:29 PM
·I own one of these Dr. Wattson meters . http://www.rc-electronics-usa.com/ammeters/dc-amp-meter.html·· , what kind of sensor do you think their using to read values ?

Thank's Brian

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03-29-2007, 12:58 AM
The specs on the site show it has a .001 ohm resistance. So they are measuring voltage across a .001 resistance using a microprocessor with an ADC and calculating the values against time. Typically another chip (current sense) that amplifies the voltage across the resistance is used as well.

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