The variac is the best way to be sure of the results. Another alternative
would be to measure the RMS current and square that and multiply by the load
resisance. Even a chopped waveform will give accurate results with that method.
The PCE830 is designed to take that into consideration unless it is of little
value.
Dave
-----Original Message-----
From: Bob Higgins <rj.bob.higg...@gmail.com>
To: vortex-l <vortex-l@eskimo.com>
Sent: Tue, Feb 3, 2015 3:06 pm
Subject: Re: [Vo]:MFMP testing schedule
The PCE830 will take this into account for all of the harmonics automatically
once it is setup properly. It should be a nearly perfectly resistive load
until over 100kHz, which makes it only a small problem with using the inline
meters. Once they have the PCE setup properly, then they are in good shape.
They have the option to put the SCR controller into zero-crossing mode (which
they should do if they use it). However, now they are now switching to using
the variac as the source. Then it gets much simpler.
On Tue, Feb 3, 2015 at 1:00 PM, David Roberson <dlrober...@aol.com> wrote:
I am following their comments as best I can. If they are using a waveform
cutting circuit such as with SCR's then the fundamental current will be shifted
in time as compared to one that is not cut up.
I would measure the RMS voltage at 60 hertz, and read the fundamental 60 hertz
current. Then multiply these by the COS of the phase angle between them. It
does not work to use the RMS values of these waveforms (including all
harmonics) to obtain the product.
Dave
-----Original Message-----
From: Bob Higgins <rj.bob.higg...@gmail.com>
To: vortex-l <vortex-l@eskimo.com>
Sent: Tue, Feb 3, 2015 2:55 pm
Subject: Re: [Vo]:MFMP testing schedule
There was a voltage multiplier set in the setup of the PCE that has been
corrected. In-line measurements are being used to verify the setup of the PCE.
I don't think they should be using the SCR controller - I would rather they
use the variac. The load should be pretty much flat-on resistive for all of
the harmonics. They are currently measuring a PF=1. The concerns with the SCR
controller are asymmetric +/- switching and noise that could be introduced into
the thermocouple channels. Painful to watch sometimes, yes; but they are
working through it. I have a chat line open to them.
On Tue, Feb 3, 2015 at 12:35 PM, David Roberson <dlrober...@aol.com> wrote:
The guys performing the test are being tricked by the phase shift between the
current and the supply voltage. A triac controller will cause that to happen.
Can someone contact them directly and let them know that this may be the
hangup. It is painful to watch them chasing this problem.
I can not get in touch with them directly. Thanks.
Dave
-----Original Message-----
From: a.ashfield <a.ashfi...@verizon.net>
To: Vortex-l <Vortex-l@eskimo.com>
Sent: Tue, Feb 3, 2015 11:55 am
Subject: [Vo]:MFMP testing schedule
MFMP have laid out their schedule for testing the Rossi style high
temperature E-Cat.
DogBone Week, Live Now
http://www.quantumheat.org/index.php/en/home/mfmp-blog/446-dogbone-week-live-now
Adrian Ashfield
