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Could larger resistor values be used for measuring larger values of Rs. I think the answer is yes. If the signal source is an RF signal generator the load on it would need to always be 50 ohms. 73

Got it, Attached is SimSmith solution with measured V to Q equation. Equations are: XL=2*Pi*G.MHz*L1.H*1e6; Rs=(R1.V.M*50)/(2-R1.V.M); Rs=1/(1/Rs-1/50); Q=XL/Rs; John KN5L

Added a 50 Ohm load to BNC connector fixture shown in: https://www.kn5l.net/Inductor-Plots/VNWA-Measure/ Section: "Voltage Ratio Q Measurement" With Generator set to 1Vrms output, Oscilloscope

I decided to tighten it up and put the termination at the meter. Mikek

The following files and folders have been uploaded to the Files area of the [email protected] group. * /Q-factor (Q is the inverse of dissipation factor DF)./Method

I uploaded the original article to the files section.? Notification should show shortly. Ron

Use the five-sided box to mount everything, not the lid. Pete

I converted your photos into a PDF using the free open-source GIMP. https://www.gimp.org/ I put it here in the files section of the group

SimSmith model attached, John KN5L

Thanks, no edit though :-( Mikek

I'm missing a detail. It looks like we need to set the 1 Volt input without the DUT connected, then insert the DUT and tune for lowest voltage. (no need for constant voltage source as I said before)

Sorry forgot my proposed Layout.

I want to try this, since I now have an HP 3400 RF voltmeter. It will only go to 10 MHz. I'll use my scope after that. I'll be using a 4" x 2" x 1" tall cast box.See attached pictures. I'll install

Appended to: https://www.kn5l.net/Inductor-Plots/VNWA-Measure/ is section "FT114-31 9T SRF Q Measurement" which demonstrates measuring a high inductance Ferrite inductor at Self Resonant Frequency

Obviously, you would need to generate a more finely incremented Table one. Mikek

My scanner is finicky these days, I took pictures. If they don't help, I'll work with my scanner. Mikek

I would appreciate a scan if you can do so. I can't get images to load either, so it's essentially impossible to follow the description.

I found this in my files while looking for something else. Method Simplifies Testing High-Q devices, Alan Victor. https://www.edn.com/method-simplifies-testing-high-q-devices/ I can't get the Figure

The Sangamo Weston S 82 galvanometer pictured has a significant overshoot when given a step increase in current. The coil is 146Ω and it is recommended that a 2KΩ resistor be put in parallel with

Would it not be possible to come up with a temperature stable (within reasonable room temp) in a 1" x 1" size or however you make it low inductance and make a Kelvin connection to that. Have a switch