This video shows the point I am trying to make about ammeters. You have to break out the wire to measure current. If you put the clamp around the whole circuit + cancels - and you measure no current:
http://www.youtube.com/watch?v=z-KfZvbjyBY The person in this video used an X-Acto knife to cut through the outer insulation and separate out the individual wires. I do not recommend that. My ammeter came with a breakout cable like a short extension cord. You plug the breakout cable into the wall socket, and the equipment into the other end of the breakout cable. To measure voltage you need access to the exposed wire itself. During the second test, the equipment was already running when Levi et al. arrived. I guess they did not stop it, so that means the 3 wires were already exposed. In other words, the breakout segment was put there by Rossi. Knowing him it was the X-Acto stripped wire method. The paper says they used 3 clamps, one on each wire. The meter is set up for 3-phase power. Elsewhere one of the researchers reported that they tested the meter with a resistor. - Jed
