The measurement task has been made unnecessarily difficult by specifying
3-phase input to the control box. Normal single-phase input would suffice
here, given the power levels.
They redesigned the control box between the December and March tests, changing
the output from 3-phase to single-phase. I would suggest that they do the same
sort of thing on the input side. Measurement ambiguity would be reduced as a
consequence.
Just a suggestion to the Rossi team (on the off-chance they are reading any of
this).
Andrew
----- Original Message -----
From: Duncan Cumming
To: vortex-l@eskimo.com
Sent: Monday, May 27, 2013 11:38 AM
Subject: [Vo]:Re: [Vo]:Torbjörn Hartman describes power measurments
I am not sure if I count as a skeptic, because I am not saying that any kind
of scam was perpetrated. I am certainly not suggesting that there was a DC
power supply hidden in the wall! My doubts are related to the electrical
engineering skills evident in the published paper, attempting the notoriously
difficult task of measuring three phase non sinusoidal power. Not only is the
waveform non sinusoidal, it is a trade secret!
I am merely saying that rectification will cause a misleadingly low value of
current to be registered using a clamp on ammeter. Since the DC is not smooth,
there will, indeed, be a small reading from the ammeter but substantially lower
than the actual current. This will, in turn, lead to a misleadingly low power
measurement.
Duncan
On 5/26/2013 8:46 PM, David Roberson wrote:
Robin,
The problem at hand is that the skeptic claims that power due to the DC
current can be very large and not detected. There has been no discussion of
the AC current reading being affected by the DC so far. That is a different
issue entirely.
I would like for them to answer the questions because then they might
realize that their position is invalid. I can explain this if required. No
one is suggesting that Rossi actually has a DC power supply hidden within the
wall I hope. This would be beyond reality since it would be so easy to measure
with a voltmeter or any monitor that looks at the voltage. The testers did a
visual look at the voltage from what I have determined.
So, skeptics, what say you?
Dave
-----Original Message-----
From: mixent <mix...@bigpond.com>
To: vortex-l <vortex-l@eskimo.com>
Sent: Sun, May 26, 2013 11:08 pm
Subject: Re: [Vo]:Re: [Vo]:Re: [Vo]:Re: [Vo]:Torbjörn Hartman describes
power measurments
In reply to David Roberson's message of Sun, 26 May 2013 22:35:09 -0400 (EDT):
Hi,
This is a little different. A full bridge rectifier will allow for both halves
of the AC current to pass, and so it should be measured as little different to a
purely resistive load. However a single diode will only allow one half to pass,
which *may* mess up magnetic field based current measurements.
(I guess whether if does or not depends on the sophistication of the device.)
>
>Assume that you have a bridge rectifier in the blue box. This is followed by
>a
filtering capacitor. The DC is then used by the electronics connected to the
capacitor. Are you saying that it is not possible to determine the power input
to this type of network by measuring the input AC voltage and current? Or are
you saying that someone has performed a scam and put a DC supply in series with
the normal AC voltage?
>
>You do know that this could easily be measured by a simple DC voltmeter, right?
>
>Dave
[snip]
Regards,
Robin van Spaandonk
http://rvanspaa.freehostia.com/project.html
