Or "pitfalls" you will find many posts by group members discussing how to If you search this group for "measure inductance", "measure capacitance" Made at several positions on the Smith Chart. The phase angle ranged from 175 to 35ĭegrees and the reactance from close to 0 to 250 ohms. You can see that the measured inductance over the entire frequency range I imported your s1p file into NanoVNA app and plotted inductance, Reactance of ~50 ohms or at the top of the Smith chart in order to get It is not necessary to measure at a S11 phase angle of 90 degrees, a The reactance is purely inductive (Smith 12:00) I moved the markers (they all move together, so choose one) so thatġ. On Sat, at 5:00 PM Roger Need via groups.io wrote:
The impedance other than pure resistance of the windings, themselves.Ībove that frequency, the inductor would measure as a capacitive reactance.
Would be where your inductor exhibits self resonance. Point where the inductive reactance cancels the capacitive reactance. If you had run your sweep well above 4.0 MHz you would eventually reach a
The complex reactance at the intended design frequency is important. If the inductance is critical as in a tuned circuit, this is why measuring Therefore, as frequency increases, the amount of availableĪccumulated capacitance cancels more and more of the intended inductance. This capacitance cancels a portion of the ΜH, there is a reasonably large accumulated series capacitance due to So, what is occurring here? For an inductor this large, nominally about 6 Using only the values read from the three markers on the Smith Chart, IĬalculated the resulting inductance for each of the three frequencies using This illustrated the power of measuring inductance at differentįrequencies, or the frequency at which the inductor will be utilized.
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