Testing the TK Tar Baby

[mrsean2k]

WRT @gmeast 's results he claims that:

"It's important to note that the battery voltage has not dropped more than 0.8V in more than 30 hours of testing, and these are small batteries ... 7Ah each and two in series for a nominal 24VDC & 7Ah and they are running everything."

Looking at the rough guide here:

http://www.energymatters.com.au/renewable-energy/batteries/battery-voltage-discharge.php

a difference of 0.8V can represent a total discharge of anything up to 75% of the capacity of the original.

[picowatt]

WRT @gmeast 's results he claims that:

"It's important to note that the battery voltage has not dropped more than 0.8V in more than 30 hours of testing, and these are small batteries ... 7Ah each and two in series for a nominal 24VDC & 7Ah and they are running everything."

Looking at the rough guide here:

http://www.energymatters.com.au/renewable-energy/batteries/battery-voltage-discharge.php

a difference of 0.8V can represent a total discharge of anything up to 75% of the capacity of the original.

Although I have not seen his circuit or test setup (unable to "view" anything over there), he has mentioned frequencies as high as 12MHz or better.  Hopefully he is aware that the possibility of measurement errors due to inductance is 5 to 6 times greaterat 12MHz than the effects of inductance on measurement errors in the NERD circuit with its lower frequency.

In looking for a non-inductive resistor, the best I could find that actually provided inductance data had a stated 10nHy inductance when measured/connected .2" from the package.  Many of the manufacturers of non-inductive resistors whose data I looked at merely specified "less than 100nHy" for their non-inductive resistors.

Using the 10nHy figure, at 12MHz, that's .733 ohms that must be added to a CSR value using the best non-inductive resistor I could find (possibly there are better).  If the CSR used is 5 ohms or less, that .733 ohms represents a significant error.  With a CSR of 1 ohm or less, that .733 ohms represents a huge error.

Does anyone know what value gmeast is using for his CSR or load resistor?  Has he given any inductance values for either?  Has anyone seen an image of his set up? (short leads, etc)

PW

[picowatt]

Quote from: Rosemary Ainslie on Yesterday at 04:40:59

    And Poynty - here's another thing I've thought of.  The impedance is INCREASED - those Ohmic values INCREASE - as the frequency increases.  Conversely, it would be LESSENED as the frequency is slower.

As I surmised, and as she again recently states, she thinks she is describing capacitive reactance in the above quote.  However, the above quote describes the exact opposite of the action of capacitive reactance.

Capacitive reactance decreases as the applied frequency increases.

Using and correcting her words, it should have read as:

"The impedance is DECREASED- those Ohmic values DECREASE- as the frequency increases" 

[poynt99]

PW,

Regarding the older replication, I think this says it all:

"It's important to note that the battery voltage has not dropped more than 0.8V in more than 30 hours of testing, and these are small batteries ... 7Ah each and two in series for a nominal 24VDC & 7Ah and they are running everything."[\quote]

[TinselKoala]

PW,

Regarding the older replication, I think this says it all:

Yes,  I noticed that too. A claim giving data showing a definite DISCHARGE but interpreted exactly backwards.

Also note that gmeast has confirmed that the short ON duty cycle claimed in the Quantum article does not produce substantial load heat, just as I said long ago, that the given 555 timer makes an exactly inverted duty cycle, and that he is using a completely different circuit, with mosfet gate driver chips, a flyback diode, a different oscillator circuit, a different load arrangement, different operating frequency and very different duty cycle than is claimed in the Quantum article he is supposedly "replicating".

Cock-a-Doodle-Doo!