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[SOLVED] Why use a Boonton 34A Resonant Line?

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chiques

chiques

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If I wanted to measure ESR of a capacitor at lets say 130MHz, I would need at least 0.57m resonant line.

Why not just use a high quality coax cable versus the Boonton 34A?
 


krp,

Thanks for the boost. :smile: But I think there is more to say about chiques question, "Why use a Boonton 34A Resonant Line?"

There is nothing magical about the technique, and thus you can make your own high-Q resonant line. you don't need to use that old thing.

We have even had past success using loosely coupled microstrip lines. So let your imagination loose and live a little!

Mark
 

OK on the "boost"; I found your articles very informative and I'm considering making a line as I have machining capability.

I've been idly thinking about using a helical-resonator structure; it may not have as high a Q as the line but it would be much smaller.

There is certainly lots more to say on this subject but my usual response to a question is to point the questioner to a source or sources that will allow him/her to find the answer.

Chiques; here is a good basic paper on Q measurement; it addresses lumped components, not the 34A, but it's a very good paper.

**broken link removed**
 
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YES! A helical resonator is a very viable choice, especially for low frequencies. (Basically, you want to avoid a magnetic component that radiates power.) You can use soft copper tube inside a cardboard "sonotube" lined with copper foil, even! Computation of DUT parameters might get a little interesting, but i think it had been done in the distant past...
 
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