I took some of the larger salt crystals to Artengine’s Modlab gathering yesterday to perform a mechanical force test to measure voltage on both an analog and digital oscilloscope. For my first test I constructed a holder for a single crystal out of conductive foam and a small sheet of copper.
I hooked the ground terminal to the copper and tapped on the exposed crystal head with the power probe.
The oscilloscope was set at 10 millivolts per division and auto-triggering so when I started to tap the crystal lightly we saw spikes between 40-50 millivolts. I then clamped the crystal between two pieces of conductive foam and hooked the power and ground probes of a digital oscilloscope to the foam.
After a light tap on the crystal the digital oscilloscope (set in millivolts) recorded quite a large spike!
We were able to record an output of about 100 millivolts from the digital oscilloscope just with light tapping on the crystal. There are 1000 millivolts in 1 volt, so the output from these tests was small, but from the experiments I could see the application of a larger force generating an even greater electrical potential from the crystal.