Rosemary Ainslie circuit demonstration on Saturday March 12th 2011

[Rosemary Ainslie]

Yes, looks like the scope is set wrongly or is broken.

The red line should also go symmetrically around the zero line as the
orange shunt voltage line.

So the Multiplication channel is displaying wrong values.

And the following is to answer Harti's points here which are quite simply wrong.  The fault was mine in that I did not 'extend' the math trace waveform.  But it is always some compromise between the voltages of the battery and the shunt. The results here are different as they've been better tuned.

NOTE.  The setting still at 50 sec's per graticule (I hope that's the term) - to show the extended duration of that parasitic oscillation in each cycle.

Kindest regards,
Rosemary

A = CHANNEL 1 - CSR CYCLE MEAN
B = CHANNEL 2 - BATTERY (DIRECTLY ACROSS THE TWO TERMINALS)
C = CHANNEL 1 - CSR MEAN AVERAGE (the question was asked)
D = MATH TRACE - PRODUCT OF VOLTAGES CSR AND BATTERY

[chrisC]

Dear Rosemary,

Do not get frustrated.  You are working on resonance circuits which are difficult to understand and reproduce.  There will be unfamiliar waveforms.  Poynt99 and MileHigh totally dismissed my FLEET waveforms also - claiming that those are wrong and worthless.  They are NOT qualified and WRONG. 

....
Lawrence

@ Lawrence Tseung
You are not just wrong but DELUSION-ALLY WRONG. Don't try to take credit from Rosie's 'discovery', even that is not yet conclusive.  Is that why that professor of physics you so quickly vouched he will prove your COP > 200 is shying away from associating with you? He's still learning to use a DSO and  to understand some electronics! His knowledge is definitely superior to your delusional talk.

@ Rosie
You've been through hundreds of posts and hitting a brick wall. Surely if you are a 100% sure, why not invite some EE department heads of good reputation universities in Cape Town to verify your results? Surely, if it was O.U by this large amount, you would have thought reputable magazines like New Scientist or Scientific American would be contacting you by now? Why not try to contact them.

cheers
chrisC

[cHeeseburger]

Suddenly the battery voltage has dropped by 10 Volts, the shunt trace averages are all negative now where they used to be positive and the red trace now looks somewhat more believable.  Such vastly changing results...remarkable!  Never the same twice...hmmm.

This shows what kinds of cherry-picked numbers can be obtained with a little tweaking when YOU ARE UNDERSAMPLING YOUR 1.5MHz BASIC WAVEFORM BY 1500x.

Notice the sampling rate is 1000 samples per second, with 500 seconds being the screen extent.  500,000 samples being taken.  So ONE SINGLE SAMPLE IS BEING TAKEN ONCE EVERY 1500 CYCLES OF THE PRIMARY WAVEFORM!

You cannot measure a signal consisting of 1.5MHz oscillations by sampling at a 1kHz rate and expect an accurate measurement.  Unless you are Rosemary, that is.   

Humbugger

[hartiberlin]

Hi Rose,
I didn´t say that your system does not work.

I only said, that your multiplication scope  trace seems to be wrongly
set or is set differently than we think it is set.

As I don´t know, what the scope exactly does there,
just from multiplying, it should look different.

But maybe it is also integrating any samples,  so does it
do any additions over time of the sample values ?

P.S. I don´t like to fly nowadays...so  I will probably don´t visit you.

P-P-S Undersampling gives wrong results.

Regards, Stefan.

[poynt99]

Good Grief!

You're right Hum, and I've had this under-sampling go-around with Rose many moons ago. She didn't grasp the concept of the problem then, and I have my doubts she will now. The numbers are all over the place, and the poor scope doesn't have a chance at those settings. What the heck is with the perceived need to slow the PRR to 100's of seconds.

Here's an offer for Rose:

I will pay for you to ship your apparatus (minus the batteries and function generator) to me, at which time I will conduct proper testing of the apparatus with the proper equipment, the proper settings, and the proper change of probes if necessary.

If the apparatus proves to be OU, then I will also pay to ship it back to you. If it proves to be UU however, then you can pick up the tab for return shipment.

.99