If you know the capacitor value, calculating the inductance from the
resonance formula is trivial for any calculator. Just like the Grid Dipper!
2
f = 25330 / (L x C) f in MHz L in
?H C in pF
This is easily derived by setting up the requirement for resonance: XL =
XC and plugging in the appropriate units.
I would propose the inductance measurement would be most meaningful if
measured at the required target frequency.
Dave - W?LEV
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On Sun, Aug 15, 2021 at 5:30 PM Joe WB9SBD <nss@...> wrote:
Hi Dave,
Ok I'll try both methods and see if it comes up with different answers.
Now is there anywhere a he he he "Video" or a written step by step etc,
on how to do the smith chart way?
Joe WB9SBD
On 8/15/2021 11:41 AM, David Eckhardt 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*
