Ok, I have a very odd situation that I'm trying to figure out.
The scenario:
4 wire Kelvin clips measuring a 100k resistor connected to my 3457A
Sitting on a 1ft x 1ft white ceramic tile.
Under that is 1 inch thick what I assume is oak wood (Desk).
About 29 1/2 inches down from that is a ceramic tile floor.
Under that is concrete (It's in a basement).
Now for the weird part.
Stable reading on the meter..last digit flickers a little.
I'm sitting in a typical office chair with cloth cover, plastic coasters and a high back.
I'm wearing leather sandals.
I'm not touching the desk or anything but the chair and floor.
Ok..the really weird part....
If I move my foot off the floor...even slowly...the resistance drops about 100 ohms or so.
Without the sandals...it does nothing.
If I move the test setup off of the ceramic tile to the wood surface, it also doesn't do it.
I can repeat the process over and over again without fail. Faster movements appear to produce more drop.
Any thoughts on what mechanism is in place here ? I'm thinking Piezoelectric effect somehow producing a voltage which is being picked up by the sense wires ?
I just switched it to volts, it has a 10G ohm input impedance. The moving foot sometimes produces up to about 0.4V on the meter even with the 100k resistor still connected. I think I need to ditch the ceramic tile or get a grounded one.
Jeff