Testing the TK Tar Baby

[picowatt]

TK, FTC,

Is that a sim from .99?  If so, maybe he can tell us where those values came from.

TK, are you fairly certain of your inductance measurements?

All the others being discussed are much lower.

PW

[TinselKoala]

TK,

Your figures corrected for the CSR inductance are getting close to going the "other way".  The fact that the oscillation is not a pure sine at 1.5MHz, i.e., it contains a lot of  harmonics, that reactance value at 1.5MHz may not be accurate as well, and would still be too low regarding those harmonics.

You might try making a measurement using a non-inductive or less-inductive CSR for a comparison.

It is a shame that the manufacturer and part numbers are not listed in the papers.


PW

If I can be convinced that they took into account their inductance and did it correctly, and that their resistors have that low inductance... then I'll be happy to oblige. Right now, though, I am looking at this  figure below, that I'm linking yet again, and that .99 posted to me showing the "average power" or average VV figure that I thought I was supposed to be emulating.
There is no evidence in their waveforms or settings that they have substantially different inductances than I do, as far as I can tell. Certainly not by a factor of nearly 20. I also am suspicious of their stated load inductance, which also seems implausibly low.

[fuzzytomcat]

And just where did those figures come from? That is a sim, right? Designed to mimic the behavior of the circuit?

4 resistors in parallel with 275 nH inductance each should total about 69 nH, isn't it?

Hey TK,

That circuit is the same as paper #2 and your right the BLOG http://newlightondarkenergy.blogspot.com/2011/04/109-simulated-circuit.html#links is a sim circuit with those figures shown ... unknown where the those figures came from but the schematic is the NERD's not .99's

There is a prior blog post http://newlightondarkenergy.blogspot.com/2011/05/120-revised-report.html#links with ....

5. SIMULATION
5.1 The circuit was setup in Simetrix version 5.4 ( Figure 7 ) and simulated in correlation with the above tests ( Figure 8 ).

Cheers,
Fuzzy

[TinselKoala]

TK, FTC,

Is that a sim from .99?  If so, maybe he can tell us where those values came from.

TK, are you fairly certain of your inductance measurements?

All the others being discussed are much lower.

PW

I am using a new meter. I did my best to qualify its readings at low inductances.
If I measure a marked 1.5 milliHenry inductor, and it measures 1.5 milliHenry on the meter, and then if I measure one 1 microHenry inductor, and it measures one microHenry, and then I measure two of them in series and it measures 2 microHenry, and then I measure three in series and it measures.... and I measure 6 in series and it measures 6 microHenry.... and then I measure the resistor and it measures 7 microHenry ... what am I to believe? It's a number in a box.
http://www.youtube.com/watch?v=D36aK5XHoHc

[picowatt]

TK,

I have a few questions regarding that scope shot, particularly if the text is correct regarding the FG being at full negative offset.

In any event, I do not see how the CSR inductance can be estimated from that shot.  As this is critical to power calculations, I assume it will be addressed with greater clarity in the future, or at least a non-inductive resistor used.

As for now regarding your circuit, and not being certain what resistors RA used, I do not know what to tell you.  Possibly .99 has some suggestions.

I believe you said you checked your LCR meter against a "known".  Are you fairly confident in your inductance measurement of the shunt resistors?  Enough so that you do not feel it necessary to try an alternate meaurement of one of the ten watters with the FG, etc?

PW