-----Original Message-----
From: George Holz

George: I presume that channel 1 in the scope photo is the voltage waveform.
What is the channel two waveform? It looks like the voltage across a
current sampling resistor in series with the solenoid. What is the value of
the sampling resistor?

Terry: No, the input is a current probe:

Here are the specs (thanks Keith):

http://assets.fluke.com/datasheets/80i-110s-Spexs.pdf

Here's a piccy in operation:

http://www.geocities.com/terry1094/current_probe.JPG

George:  The mechanical energy output looks more difficult to verify.
The only proof of utility that would be convincing is a
self runner. Put an efficient permanent magnet generator on
the shaft and measure the electrical output as a next step
toward a self runner. An electrical to electrical energy comparison
would be more convincing.

Terry: Agreed on sefl-running. However, he only has about 2 Joules per cycle to play with. His torque measurement device was custom make and the sensor cost him $10k. BTW, for the next iteration, Paul has publicly claimed he hopes to have a COP of 20 with plenty energy to self run and drive an electric load.

Where are you located, George?

Terry





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