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How to measure inductance of air-coil using E5062A?
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on Jul 17, 2009
on Jul 19, 2009 by Dr_joel
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Can anyone tell me step by step to measure inductance of an air-coil using E5062A ?
Is any other tools needed instead of coaxial cables ?
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Jul 19, 2009 10:57 PM
It really depends upon how you will use the coil. If it is to be used in a PCB, the best way is to create a PC board fixture that matches your mounting method, measure the s-parameters of the coil and PC board, and fit a model to the measured results.
But, a pretty good and simple way is to use an SMC connector, cut the pin very short. Calibrate in SMA, add the connector and port extend until the open end looks like a dot (open) on the smith chart.
Now, solder the inductor from the center pin to ground of the SMA connector, look on the Smith chart, in the "inverse smith chart" mode, and see how the inductance changes with frequency. I like to measure the inductance where jB (in the G+jB) gets to 20 mmhos, and then I look at the inductance value. You can look where it crosses the short circuit point to find the Self Resonant frequency and compute the SRF c value from that and from a low frequency inductance value.
I wrote an RF design article many years ago on this topic, but I can't find it online:
"Utilize an ANA to model lumped
circuit elements" Joel Dunsmore,
Microwaves and RF, Nov 1988. pg 11 1
There is also an older paper that had a lot of details in it from ARFTG (from google scholar):
http://ieeexplore.ieee.org/xpls/abs_all ... er=4119783
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