On Fri, Mar 19, 2021 at 05:45 AM, jmr wrote:
Here's a nanoVNA-H measurement of a Micrometals T50-6 powdered iron toroid
with 22 turns spread over about 270degrees of the toroid. The inductance
should be about 2.2uH and you can see the nanoVNA does a good job again. It
also has a reasonable stab at measuring the series resistance although the
data gets a bit noisy above 20MHz. I keep meaning to add averaging to my PC
tools. The nanoVNA is much more powerful than a typical low frequency LCR
meter because it can measure the inductance across a wide frequency range. The
inductance at the design frequency can usually be measured quite accurately.
It often manages to give a reasonable estimate of Q for powdered iron toroids
like this.
If you make the measurement using the NanoVNA app by OneOfEleven you will see that it has adjustable sweep averaging and data smoothing built-in. You can also import the s1p file for post processing. The graphing capability is quite good with many scaling options. Once I starting using this tool I stopped using NanoVNA Saver. The calibration routine is very nice as well.
Roger
Roger Need