Marko Rodin Coil -- 007 Device

[TinselKoala]

TK,

As you already pointed out, we've seen the Irms X Vrms thing and disregard for phase shift/PF before.

Did you look at page 10 of the PDF I posted regarding current probe Russ is using?  The phase shift of the current probe is pretty severe at some of the fundamentals and harmonics he is using.

With regard to the page of data you posted showing a scope capture and power "calculations", where was that info taken from?  Was there a schematic provided for the test/measurement setup?

Where are these "materials" located?

PW

The scopeshot and power calculation images I posted are in the "007" pdf here:

http://rwgresearch.com/wp-content/uploads/2016/06/Rodin-007.pdf


No, there is no complete, or even partial, schematic shown in that document.

I don't see what they are using for a current probe in that report. They are, however, using a TPP0500B passive 500MHz voltage probe (about 600 dollars new) to measure their 641 Hz and 1574 Hz  approximately sinusoidal oscillations.
(None of the scopeshots shown in the paper show the "2168 Hz" frequency claimed in the first page of the report.)

The LED loadbank is said to be "close to full illumination" but of course there is no actual measurement of light output. Anyone who has actually done instrumental measurements of light from LEDs or incandescent bulbs can testify to the fact that the naked eye is relatively insensitive to even large changes in actual light output as measured by a lux or lumens meter. So the subjective "close to full illumination" claim can be disregarded as nothing more than an unreliable anecdotal statement. In fact if the naked eye judges them to be not fully lit, then they are probably running at _much_ less than full power.

Surely a lab that would use a 600 dollar 500 MHz probe to scope a 1574 Hz sinusoid on a 350 MHz scope could arrange to do some proper luminance measurements. Don't you think so?

[picowatt]

But that is nothing like the test conditions stated in MH question.
There is no sine wave,as the voltages applied to the circuit(being the coil and ideal voltage source)are of a square wave pattern.The transition is not starting from a low point and ramping up to a high point,the transition is instant,and there is no resistance to sink the existing current flowing through the circuit.

Try to visualize this in the frequency domain.

The only difference between the 1kHz sine wave and the 1kHz square wave is that we are adding additional, higher frequency sine waves (harmonics) to the fundamental sine wave of 1kHz to create the square wave.  The number of harmonics added depends on how square, or fast, we desire the rising/falling edges to be.

An infinitely fast transition (instantaneous transition) requires an infinite number of harmonics (infinitely high frequency content).  In the real world, a decent square wave can be realized with 5 harmonics.  However, fast transitions with very fast (straight) rise and fall transitions and nice looking sharp corners requires considerable bandwidth (additional harmonics).

Each of those added harmonics are just additional sine waves with progressively higher frequencies.  Because the reactance of the inductor increases with frequency, current flow will decrease with respect to each harmonic added to the fundamental sine wave.

A faster transition contains higher harmonics (frequencies) which means less current flow through the inductor for those higher frequencies due to the increased reactance of the inductor at those frequencies.

As I have suggested many times, consider looking at various FG waveforms using your scope's FFT function to visualize the frequency content of those waveforms as you change their parameters.

Alternately, without a DSO to produce FFT's, passing a 2kHz square wave through an audio graphic (or parametric) equalizer while watching the output with a scope as the equalizer's controls are adjusted can be informative.

PW

[picowatt]

Surely a lab that would use a 600 dollar 500 MHz probe to scope a 1574 Hz sinusoid on a 350 MHz scope could arrange to do some proper luminance measurements. Don't you think so?

One would think... 

Thanks for the link, I'll take a look.

PW

[MileHigh]

Try to visualize this in the frequency domain.

Very few people on the forums understand the concept that a signal in the time domain can be expressed in the frequency domain.  Likewise very few understand that you can transpose a signal back and forth between the time domain and the frequency domain using Fourier transforms and inverse Fourier transforms.

This is more abstract a concept than an ideal voltage source or an ideal current source.  Let's hope for the best.

I am attaching a graphic for a square wave in the frequency domain.  Of course this only shows the positive frequencies.  There is no point in discussing the negative frequencies that make up a square wave because that would be a mind-bender that would generate 200+ postings of abject refusal with a slim possibility of surrender.

[picowatt]

Animation of adding sine waves (harmonics) to make a square wave:

https://en.wikipedia.org/wiki/Square_wave#/media/File:Fourier_series_for_square_wave.gif

Taken from the Wiki:

https://en.wikipedia.org/wiki/Square_wave

PW