Re: [TCML] voltage

[jhowson4@xxxxxxxxxxx]

Ah a current transformer, that's the part I was missing. Thank you for the clarification. 

The only other question I have is, would it be possible to use a standard multimeter to measure the outputs from the sensors? I know you are looking for the peak of the waveform. 
But I figure that most of us do not have fancy oscilloscopes laying around. But a multimeter on the other hand! 
At first glance it appears the one might be able to pull it off, using an opamp or something similar. Just boosting what ever signal you have, and then filtering the opamp with a capacitor across the output read a voltage peak. 
You would of course have to add some form of impedance matching components to simulate the presence of an oscilloscope . I am not an electrical engineer, but i will be taking electronics classes next year. Hopefully I will understand this stuff then. 



Thanks, 
John "Jay" Howson IV 


"Why thank you, I will be happy to take those electrons off your hands." 

----- Original Message -----
From: "Bart B. Anderson" <bartb@xxxxxxxxxxxxxxxx> 
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx> 
Sent: Friday, January 27, 2012 8:52:26 PM 
Subject: Re: [TCML] voltage 

Hi Jay, 

I built Terry's antenna array many years ago. The calibration is 
performed as: 

1) Use something like a wideband CT to measure secondary base current. 
2) Adjust the proximity of the antenna to the coil until the current 
antenna matches the base current CT measurement. 
3) Keeping the antenna array at this position, adjust the capacitance on 
the voltage antenna until the voltage measurement matches 2*pi*Fo*Ls*Is. 

At this antenna proximity, both Is and Vs would be "calibrated". 

Take care, 
Bart 


On 1/26/2012 6:06 PM, jhowson4@xxxxxxxxxxx wrote: 
> Here is a link to Terry Fritz's papers. for those of you who are looking 
> http://www.capturedlightning.org/hot-streamer/TeslaCoils/MyPapers/planant/waveant3.html 
> 
> 
> i just read threw it, and the only thing i have a question on is how is he calibrating the current? 
> 
> He says " The calibration of the current is adjusted by moving the antenna closer to or further from the coil. The calibration of the voltage is adjusted by varying the value of C3. Once the current is known, the secondary voltage can be calculated by the following equation:" 
> and 
> " The distance of the current antenna was adjusted until the base current was equal to the current on the current probe antenna." 
> 
> but no where can I find what exactly he is calibrating it too. 
> Is the base current the current from the RF ground to ground? 
> 
> 
> Also maybe I am missing something but, after reading it a few times it seems to me that based on this statement 
> 
> " Once the current is known, the secondary voltage can be calculated by the following equation: 
> 
> Vs = Is x Ls x 2 x pi x Fo 
> 
> 
> Where: 
> Vs = The coil's secondary voltage 
> Is = The coil's secondary current 
> pi = 3.14159... 
> Fo = The coil's resonant frequency " 
> 
> it appears that all we really need to know is the current, and the voltage can be calculated with ease. 
> or is this just for calibration purposes? 
> 
> 
> It would be nice if the calibration process was explicitly outlined in a step by step fashion. Maybe i am just being dumb and don't understand what he is doing. Can someone smarter than me shed some light onto this? 
> 
> 
> 
> Thanks, 
> John "Jay" Howson IV 
> 
> 
> "Why thank you, I will be happy to take those electrons off your hands." 
> 
> ----- Original Message ----- 
> 
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