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Re: Measure Inductance?


 

Agree.? Measure it directly.? Using the method in the vid gives the capacitance inductance product, but not the individual values.? You still need to know the value of one of them to measure the value of the other.? Maybe the value printed on the capacitor is good, but it has a tolerance and may be off even more than that.? Plus, the test setup is adding stray capacitance and inductance that further obfuscates what you want to measure. No need to go back to the old grid dip days, except perhaps for nostalgia.

Agree on YouTubes too.

On Sunday, August 15, 2021, 10:41:30 AM MDT, David Eckhardt <davearea51a@...> wrote:

Is everything these days a YouTube "presentation".? I'm not knocking what
is presented, as the theory is sound and is rather reminiscent of the setup
employed when measuring inductance with a grid dip oscillator, but a bit
more accurate.

Any of the NANOs can measure inductance (and capacitance) directly using
the Smith Chart option and the Cursors.? Once calibrated, the inductor is
connected across the source port directly, yes, both center pin and
backshell of the connector.? It will be in parallel with that port.? Once
configured, the value of the real part and the equivalent reactance of the
complex port (the inductor) can be easily read in the upper left of the
NANO display.? The NANOs can also be configured to simply display the
reactance of the complex part directly instead of the equivalent value of
the lumped inductor.? Again, just an absolutely wonderful instrument which
compares embarrassingly well to the (expensive) HP/Agilent/Keysite VNAs.

Dave - W?LEV

On Sun, Aug 15, 2021 at 1:59 PM Joe WB9SBD <nss@...> wrote:

I found this video,

It seems like maybe a better way?



Thoughts?

Joe WB9SBD

On 8/15/2021 4:59 AM, Victor Reijs wrote:
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




















--
*Dave - W?LEV*
*Just Let Darwin Work*

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