These are the results of work done by another group trying to replicate
the testatika. They've kindly allowed me to display their results so
that I can show that the result of interaction with grids like this
is AC. Their set up demonstrates it more clearly than my setup does.
Some of my own demonstrations of this output are
here and here.
The Setup and Results
A diagram of the setup is below. The input is DC.
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The reasons for the different peak-to-peak voltages
below is because different gap sizes were used between the lamella and
the tasters (ES1 and ES2 above).
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