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Thread: Measuring Analog Voltages w/o Sharing Grounds
www.piclist.com/techref/microchip/ios.htm?key=analog
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face BY : Jim Hartmann email (remove spam text)



A simple technique requiring a capacitor and DPDT relay:

Vx+ >----o | o-----> AtoD
          |
         +-)(-+
             C |
          +----+
          |
Vx- >----o | o-----> GND

Relay on to sample Vx, relay off to measure.

<OF0BF3550F.34A89BB3-ON86256818.005EA088@sk.cargill.com>

See also: www.piclist.com/techref/microchip/ios.htm?key=analog
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