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Re: Measure Inductance?

 

This is what I get using an inductor (7 turns of RG58A through a toroid)
and the component is connected to CH0 and calibrated:
[image: afbeelding.png]
You see the S11 |Z| graph is a straight line (when it is displayed
logarithmic and the freqy axis also logarithmic). A mor eor less pure
inductance will be a stright line going up (a capacitance a straight lien
going down). And Marker1 is at around |Z|=94ohm (and in the Marker 1 info
you see an 'Series X': 51.551uH.
You can also see the S11 Serial L [H] graph where you can see the
inductance is around 52uH.
If I would have shown a larger freq. range, S11 Phase would have gone
through 0 (aka resonance).
So no extra component needed.


Hope this helps.

All the best,

Victor

Op zo 15 aug. 2021 om 11:59 schreef Victor Reijs via groups.io
<pe1atn.victor.reijs@...>:

I think you need a low frequency to determine the inductance (as say you
know).Say between 10kHz and 200kHz? The log(|Z|) curve in a log(Freq)
should go up in a straight line (NanoVNA Saver can provide this log axis).

All the best,

Victor

Op zo 15 aug. 2021 om 01:29 schreef Bob Albert via groups.io <bob91343=
[email protected]>:

First put an adapter on the SMA connector and set up the calibration.
Go
to Smith Chart. Select your frequency range. Short the test leads and
see
how much residual inductance there is. Then connect the unknown. Move
the
marker to whatever frequency you like and it will read out directly.
Bob
On Saturday, August 14, 2021, 02:58:37 PM PDT, Joe WB9SBD <
nss@...>
wrote:

I have a NanoVNA-H4.
Using this, what is the best accurate way to measure the inductance of a
coil?

Joe WB9SBD
















afbeelding.png

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