Re: [TCML] Tuning primary to secondary with a scope

[Gary Lau <glau1024@xxxxxxxxx>]

I don't think that you want a direct connection of the scope to the
secondary, as the capacitance of the scope and probe will
significantly alter the resonant frequency of the secondary.

Also, the primary and secondary circuits need to be tested
individually, in a way that avoids coupling between them.  Strange
things occur when they're allowed to couple, making it hard to know
what's going on.

Regards, Gary Lau
MA, USA

On Tue, Mar 20, 2012 at 8:35 AM,  <jhowson4@xxxxxxxxxxx> wrote:
> As far as i am aware,
> first connect a function generator to the secondary/toroid ( disconnect rf ground i think) sweep frequency and look for the highest amplitude with the scope.
> then you connect a frequency generator to the tank circuit and adjust the frequency until it matches the first one you found.
> You can also connect the scope to the secondary and the frequency generator to the tank circuit and look or a max amplitude in the secondary while adjusting the tap point (this also requires step 1)
>
>
> i think that's how you do it. I have never done it, but i am pretty sure.
>
>
>
>
>
>
> Thanks,
> John "Jay" Howson IV
>
>
> "Why thank you, I will be happy to take those electrons off your hands."
>
> ----- Original Message -----
> From: "Brandon Hendershot" <brandonhendershot@xxxxxxxxx>
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Sent: Tuesday, March 20, 2012 1:38:30 AM
> Subject: Re: [TCML] Tuning primary to secondary with a scope
>
> I'm looking for some information on this topic myself, If anybody
> cares to respond that would be lovely for the both of us.
>
> --Brandon H.
>
> On Sun, Mar 18, 2012 at 1:18 PM, Brian Hall <brianh4242@xxxxxxxxxxx> wrote:
>>
>>
>> Ok, so far I can hook up a function generator to one end of my secondary (with the toroid on the other end to complete that LC circuit) and use a scope with a little wire on the probe and gets its actual frequency.
>> How about the primary coil and cap frequency? I know the function generator output can go to to the tap point of the primary coil, and down under on the innermost turn is the connection to the MMC (making the other LC circuit) but should I disconnect the MMC from the power feed going in to it? So that it's just the primary coil and cap? What's the difference in the frequency of the primary when the tank is powered vs when it's unplugged? Aside from the 60 Hz coming from the outlet
>>
>>
>> ----------------------------------
>>
>> Brian Hall
>>
>>
>>
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