"The clamp ammeters were connected upstream from the control box to ensure trustworthiness of the measurements performed."
This awfully-worded decription indicates to me that the measurements were done on the input (mains) side of the control box. MAINS ----> BOX ----> DEVICE Dec Test: 3-phase mains, 3-phase control Mar Test: 3-phase mains, 1-phase control Andrew ----- Original Message ----- From: "Alan Goldwater" <a...@magicsound.us> To: <vortex-L@eskimo.com> Sent: Sunday, May 26, 2013 9:48 AM Subject: Re: [Vo]:possible error in power-in calculation in Levi et al paper > > 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. > > >
