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[Solved] NanoVNA says impedance of my 3200R resistor is 542R-1250X at 50 MHz
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hendorog:

--- Quote from: ogden on October 19, 2019, 12:00:51 pm ---
--- Quote from: hendorog on October 19, 2019, 11:29:50 am ---
--- Quote from: ogden on October 19, 2019, 07:04:44 am ---
--- Quote from: hendorog on October 18, 2019, 09:36:03 pm ---3. 1 path 2 port calibration. I _think this should_ correct for everything and be almost as good as a Full 2 port cal, but requires a manual DUT reversal.

--- End quote ---
No. You are drifting away from topic. Accurate impedance measurements mentioned in the paper you linked uses only S11 and S21. As you already find out, Nano does both.

--- End quote ---

Nope. The point is valid. The link I referenced doesn't mention that cal type, which is why I pointed that out as a separate item.
It is a cal type implemented on the 8753. The 8753 supported an 85044 T/R test set.

Actually being able to measure S11 and S21 isn't the point. The point is how accurately you can measure them. That accuracy is dependant on the type of cal you do. This entire discussion is about how to measure various impedances accurately is it not?

--- End quote ---

I did mean that NanoVNA S21 and S11 measurement and calibration capabilities are enough to perform measurements described in the article. I suspect that you think that S21 thru calibration do not measure/calibrate Port2 impedance. Well, it does. BTW components such as resistor & inductor (some other components as well) are "single port devices" that do not need to be rotated during impedance measurements.

--- End quote ---

I give up. We are miles apart in understanding here.
ogden:

--- Quote from: hendorog on October 20, 2019, 07:57:55 pm ---I give up. We are miles apart in understanding here.

--- End quote ---

Don't give up. Explain. In more details than  :blah: :blah:   like:


--- Quote from: hendorog on October 19, 2019, 11:29:50 am ---Actually being able to measure S11 and S21 isn't the point. The point is how accurately you can measure them. That accuracy is dependant on the type of cal you do. This entire discussion is about how to measure various impedances accurately is it not?

--- End quote ---
hendorog:

--- Quote from: ogden on October 20, 2019, 09:22:24 pm ---
--- Quote from: hendorog on October 20, 2019, 07:57:55 pm ---I give up. We are miles apart in understanding here.

--- End quote ---

Don't give up. Explain. In more details than  :blah: :blah:   like:


--- Quote from: hendorog on October 19, 2019, 11:29:50 am ---Actually being able to measure S11 and S21 isn't the point. The point is how accurately you can measure them. That accuracy is dependant on the type of cal you do. This entire discussion is about how to measure various impedances accurately is it not?

--- End quote ---

--- End quote ---

It is entirely explained in the previous post.

If you don't understand, then ask specific questions and I'll answer them - within my own capabilities to do so.




ogden:

--- Quote from: hendorog on October 20, 2019, 09:27:12 pm ---It is entirely explained in the previous post.

--- End quote ---

Your previous post was something like "I give up because I am way smarter".  :-// Besides your arrogant attitude, that does not explain much. So please be so kind and either provide link to post or even better: full quote. Then I will continue with questions.
hendorog:

--- Quote from: ogden on October 20, 2019, 09:38:29 pm ---
--- Quote from: hendorog on October 20, 2019, 09:27:12 pm ---It is entirely explained in the previous post.

--- End quote ---

Your previous post was something like "I give up because I am way smarter".  :-// Besides your arrogant attitude, that does not explain much. So please be so kind and either provide link to post or even better: full quote. Then I will continue with questions.

--- End quote ---

Look, you are making comments like: "I suspect that you think that S21 thru calibration do not measure/calibrate Port2 impedance. Well, it does."

I have repeatedly explained the calibration options available for the port 2 calibration, but you say something like that.

Then:
"BTW components such as resistor & inductor (some other components as well) are "single port devices" that do not need to be rotated during impedance measurements."

Sarcastic much? They are only single port if measured in S11 shunt. The pdf which Brian (virtualparticles) wrote explains in detail that there are different methods. There are even pictures on the first page. Then there is a chart which helps us decide which method to use. It's gold.

You just don't appear to be interested in learning, all I am seeing from you is a desire to argue.
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