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Problems with Measuring voltages


jerryyu

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I am trying to measure the amounts of voltages that I can get out of dry bones due to their piezoelectric properties. (basically I place the bones in between two copper metal plates with wires taped to the top and bottom of the plates). The problems I encountered was that even without releasing much stresses onto the metal plate i can still get a voltages reading and that number just stay there without me doing anything. And when my hands kind of touches it again, the voltages increased. I went to ask someone and they told me that it might be the static electricity that were built on my hand and that I should touch a metal material before doing the experiment. I did, and the same thing still happen, even after multiple tries. Just what am I doing wrong?? (I also tried putting book in the middle of the metal plates instead,and I was still able to get voltages reading).

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