Testing the TK Tar Baby

[TinselKoala]

I know about the 0.25 division TK I've been at this for quite some time.

I didn't feel it was necessary to mention; negative 74W is sufficient enough negative to see that it is negative. 

Well done on your -43W. Congratulations!. How are we going to divy the prize between you and Rosemary then? Maybe based on the ratio of negative powers? 

PLEASE NOTE: that first spreadsheet shot I posted had a formula error. The means weren't calculating correctly. This one showing the results from the first two cycles should be correct... I hope.

No, I get the whole prize, since I'm ready to ship off to an independent tester NOW.

Oh... wait.... my batteries don't pass the Dim Bulb test. Boogers.

[picowatt]

TK,

At the very least, you deserve a beverage of your choosing and a lizard treat for every dog!!

You must never rest.

(I would still like to see that 'scope shot across the load if and when you can find the time later on)

Well done!

PW

[poynt99]

What do you mean by "cycle 1" and "cycle 2"?

Aren't you just adding up ALL the powers (from all the sampled cycles) and taking an average?

[TinselKoala]

OK... just to review.

I've shown a calibration against a known measured resistance and Ohm's Law of the current measuring instruments and the oscilloscope "eyeball" method, and the scope method is within 5 percent of the true Ohm's Law value based on voltage and resistance.

I've shown that the TarBaby CVR and battery voltage traces look exceedingly similar to the NERD traces at the same magnification.

I've then done quantitative measurements on the photo of the traces to determine precise voltage values at 18 regularly timed points per cycle, over two full cycles.

I've used a spreadsheet to perform the multiplication point-by-point of those current and voltage values.

I've registered a negative mean power of over 100 Watts over the oscillation waveform.



And I've shown that my batteries do discharge, and I'll be repeating that test again later today, since now I have a full sequence: batteries used for many days testing and heating load, same batteries at the end of testing used to make the power computations, and then finally the Dim Bulb test against the two set-asides. If I have enough bulbs, that is.

[TinselKoala]

What do you mean by "cycle 1" and "cycle 2"?

Aren't you just adding up ALL the powers (from all the sampled cycles) and taking an average?

I show four complete cycles of the waveform. There are 18 data points per cycle, roughly. Since I haven't yet entered all the points into the spreadsheet, I'm reporting results as they appear. The overall mean is of course the mean of all 36 so-far entered points, or the mean of the two cycle means that are on the spreadsheet shots. I'm happy to call it negative 100 Watts, since there are obviously sampling errors (of less than 5 percent.)