How do I test for resonance

[Tesluh]

I am doing what I can to make a Don Smith style device, There is a lot of grey area as far as how to make the primary coil and how to get it "into resonance".  I have one that is powered up and appears to be resonating a secondary coil pair, each half is 4 times my primary wire length. the nst is working and the spark gap is nice and quiet.  I have 39.5" of 10 ga multi strand wire wrapped around a 2" acrylic tube, and 2 lengths of 16 ga solid copper wire wound 16 times at a 3" diameter.

My questions,
how do I determine what frequency the nst is producing?
how can I test to see that the coil I am trying to "bring into resonance" has been "brought into resonance"?

there are a lot of youtube videos that are very vague about how to test something like this...
Any help is appreciated!

[Bob Smith]

Do you have a scope? You should be able to notice the difference in the wave form when it hits its resonant frequency.

[lancaIV]

 "How do I test for resonance" 


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[Paul-R]

... how to make the primary coil and how to get it "into resonance".

I'm not too sure about this but you could look into grid dip oscillators used for RF.

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

[Tesluh]

I'm not too sure about this but you could look into grid dip oscillators used for RF.

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

That looks like a handy instrument, will look at those, the ones I found so far are only MHz and I think I need them to be kHz range.  that might be an easy way to do it.

Bob, I don't have a scope but could and should get one.  Could you walk me through connecting and testing?  The nst looks like it could easily fry an oscilloscope if not connected correctly, Would I connect the scope somewhere directly on the circuit?

Thank you!