Testing the TK Tar Baby

[Rosemary Ainslie]

Are you finished now TK?  Or are you still doing that battery discharge number?

Let me know when I'm allowed to comment.  Or do you prefer it that we leave this 'gossip' untrammeled by the input of some real science?

Rosie Pose

[picowatt]

TK,

Even if you figure in the < 1.5 watts from the Ibias source, you're still looking good.

Thanks for the video.  I forgot about how your load is arranged making it difficult to probe right at the load.  It looks like your dropping about 25VAC across the load, correct?  It also appears that the phase is shifted about 90 to 100 degrees between the traces.  Do you agree?  Is this a reliable phase measurement or a possible triggering artifact? (it looked well triggered to me).   

I wonder what would happen to the energy calculations (and the oscillation) if you were to place a cap suitable for high frequency across the battery connections at your board so that only DC is indicated at the battery terminals.

It looks like your Ibias and Ibattery ammeters are in much closer agreement than before.

Have you managed to get anything else done?  Did the pups get their shots today?

PW

 







   

[TinselKoala]

I did the average of what you had selected for all data points.

Average power = -110.56W

This is over 4 complete cycles. Usually, its good to do at least 10 cycles, but I think we see a trend here.

I didn't get quite that much. Perhaps we measured differently or I made an error somewhere, since the first two cycle means agree with yours, but my overall mean is a bit lower. Still solidly negative though.

[TinselKoala]

Are you finished now TK?  Or are you still doing that battery discharge number?

Let me know when I'm allowed to comment.  Or do you prefer it that we leave this 'gossip' untrammeled by the input of some real science?

Rosie Pose

You betray your attitude problem in two simple sentences. You cannot post here without insulting or denigrating something or somebody, and you have no possibility of understanding what's presented here, so you will deny its reality and its validity.

You have nothing of value to contribute here UNLESS and UNTIL you show your own testing.

And no, I am far from finished. In fact, I am just beginning.

[TinselKoala]

TK,

Even if you figure in the < 1.5 watts from the Ibias source, you're still looking good.

Thanks for the video.  I forgot about how your load is arranged making it difficult to probe right at the load.  It looks like your dropping about 25VAC across the load, correct?  It also appears that the phase is shifted about 90 to 100 degrees between the traces.  Do you agree?  Is this a reliable phase measurement or a possible triggering artifact? (it looked well triggered to me).   

No, I don't see that phase shift _now_. I see a tiny one of just a few degrees that might be artefact. I realize now that in the video I was triggering on the wrong channel and so I think that shift in the video is artefact. (I can't imagine a physical reason for it, the load is only 74 microHenry.)
It's running behind me right now, triggering on the proper channel and showing only a teenytiny phase shift, and I can't reproduce that shift shown in the video. Now watch youknowwho take that ball and run with it. Since there's no possibility of applying an external trigger in this case I can't prove phase accuracy except by comparisons.

I wonder what would happen to the energy calculations (and the oscillation) if you were to place a cap suitable for high frequency across the battery connections at your board so that only DC is indicated at the battery terminals.

Probably the same thing that happened in .99's simulation. The illusory oscillations on the battery voltage would go away. But the sign of the power is still determined by the sign of the current, isn't it?

It looks like your Ibias and Ibattery ammeters are in much closer agreement than before.

Yes, and I still don't fully understand this detail. It's more than coincidence but I don't see how the same current could be flowing in both places. There must be some key element I'm not getting.

Have you managed to get anything else done?  Did the pups get their shots today?

PW

Yep, dogs vaccinated, Murphy has no microchip so he's now officially our dog and not somebody's lost companion, heartworm test negative, started on preventative, everybody survived (but a Rottweiler bit a little rat dog at the vet clinic and there was chaos for 5 minutes).