The voltage measurements are identified by the nomenclature of the display, so "v12" refers to the calculated voltage difference between the phase1 probe and the phase2 probe. This is the standard measurement technique for delta-connected three phase power. The meter hardware measures the voltage from each phase wire to neutral, but that data is not displayed (although it could and should have been). The current display indicates what is measured through each of the phase wires by the clamp-on ammeter probes.
Regarding the placement of the measurement probes, the report states on page 5: "The instrument was connected directly to the E-Cat HT cables by means of three clamp ammeters, and three probes for voltage measurement." However, I note that on page 16 describing the March test it states: "The clamp ammeters were connected upstream from the control box to ensure trustworthiness of the measurements performed." Although it isn't completely clear, I take these two statements to mean that in the first test the measurement point was on the output wires of the triac based blue control box. My comments therefore were an attempt to deduce something useful about the waveforms being fed to the E-Cat, in the spirit of reverse-engineering. Regarding the instrument itself, the spec shows a transient capture capability of 16 usec, which would correspond to an upper frequency limit of 62 kHz. That is probably the source of another comment mentioning this figure. The wires from the control box to the E-Cat appear to be standard solid-core electric power wires. These would be capable of carrying substantial current at several hundred kHz, such a might be produced by a HF switching power supply. What the meter used would show from such an input can only be speculated. I am an EE, specializing in digital and analog audio systems and acoustics. On 5/26/2013 3:53 AM, Claudio C Fiorini wrote:
Alan: you measure the tension or between two phases (not between two pairs of phases as you say, excuse me), or between the phases and neutral. An open input line (usually with high impedance in the megaohm range) with a bit of cable leads always to noisy signals in the mV or even V range. Test it youself with a normal electronic digital voltmeter with an unconnected cable (I mean unattached to the 240 V AC tension) attached to the input. Perhaps in the middle of the Gobi desert or on the moon you will not catch noise, but inside a house or laboratory you will see noise. I repeat: Rossi said clearly that the measurement were made "before" the control box. (see his blog JONP, i think it was yesterday) This rules out any strange phase shift between the AC tensions leading to false tension measurements made between to phases. Furthermore: if there was such an exotic phase shift between two phases, you would expect to see also exotic tensions between the other lines. Don't you agree with me? At this is not the case. So, the hypothesis of an open tension input is not confuted by your comment. Of course i do not question this instrument PCE830. But: with a "near zero" tension, the power calculated will result in a very small value, here only 39 Watt.
