Earth Electrical Energy Datalogging Experiments

[MileHigh]

Hi Jenna,

The RMS voltage measurement is a measure of the average voltage of any waveform you have on your display.  I think I saw that in one of your clips where you show your scope.

I am not an experimenter and am just dropping into the thread.  Perhaps someone else will try it.

Good luck with your experiments.

MileHigh

[jeanna]

Oh too bad you won't be joining in the experiments.

I was taking what xee2 had to say about it from the joule thief thread. He impressed upon me that it would not be the same and if I wanted to see results I would not use the rms. It turned out to be true, so I now agree with it.

Join if you can!

thank you,

jeanna

[electricme]

@MileHigh,
Thats very good, I'm referring to your excellent suggestion of working out the wattage of the EB cells.

I have a couple of DPDT switches here, and a spare plastic case, I will dig them up and make a switch box arrangement so I can set the pot by looking at the cro display, then switch out the cro and EB cell and measure across the resistor.

This circuit should suffice I think.
When switches 1 and 2 are to the right (B) the resistance can be set, then the switches are moved to the left to (A) the DMM will read off the value the resistor is set at.

jim

[MileHigh]

electricme:

That looks great and should make life really easy.  You also want to add a SPST switch in series with the potentiometer so you can cut it completely out of the circuit.

Waveform, maximum power output, and output impedance measurements all with the flick of a few switches.  Should be awesome!

MileHigh

[electricme]

@ MileHigh,
I have redrawn the circuit just for you 

Just to make it interresting, how about we through in a u/amp meter too, then add in a range switch for good meassure, lol

Better to have everything in a standard package than having to cart a handful of instruments all over the countryside.

jim