Morning :)(adsbygoogle = window.adsbygoogle || []).push({});

I am trying to sample two different waveforms, and subtract the one from the other. Basically, I have A, B, and want C=A-B.

The device calculating the C=A-B is remote, connected to the two sampling A and B via a wireless link.

A and B do not have any common reference or ground, and the devices sampling them are battery operated.

Can I simply take the potential difference between A and a battery's negative terminal.... and B and the next battery's negative terminal... and assume that the negative terminals are equal, such that I now have two waves that I can subtract from each other to get a proper difference between the two?????????????????

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Reference Voltage Query

**Physics Forums | Science Articles, Homework Help, Discussion**