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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: P.S. posted by Dan Banquer on April 2, 2007 at 11:41:45:
And I think that no one would spend the money on network analyzers that only analyzed networks that presented conjugate matches to the analyzer!The analyzer will be happy to tell you what's happening on networks that aren't 50 ohms. Just ground one end and look at S11 and you'll know what the impedance really is. If you have access to an analyzer buy lunch for one of the guys that use it a lot and I bet they'll be glad to help. If you don't, what do you have? There are a lot of ways to measure these things, and I've probably done most of them, but the network analyzers are cool and fast.
With respect to the inductance at 100kc, I'm looking at your data. Did you happen to notice what the Q was doing at the various frequencies? Also I'm not clear what the column with ohms as a unit is. Is it the impedance of the DUT or the resistive component of the impedance?
You're probably right about stray capacitance rearing it's ugly head, you'll likely find a self-resonant frequency, but the Q may be low depending upon the shunt resistance. Watch the phase.
You might consider doing a careful sweep by hand using your function generator and scope noting amplitude and phase as you go. If there is any question about the Zo of the Fn generator or it's ability to drive low Z loads consider using a build-out resistor to give you exactly a 100ohm source.
On behalf of myself and likely many other interested folks, thanks for looking into this.
Rick
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Follow Ups
- Thinking complete... - rick_m 13:01:13 04/02/07 (4)
- Re: Thinking complete... - Dan Banquer 15:46:04 04/02/07 (3)
- Re: Thinking complete... - rick_m 17:55:20 04/02/07 (2)
- Think Marketing! - Dan Banquer 04:30:06 04/03/07 (1)
- Re: Think Marketing! - rick_m 07:04:48 04/03/07 (0)
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