![]() Plot the 3 measurements on the Smith chart assuming reactance is positive then plot them again assuming negative you will plot 6 points in total.Take measurements at 3 different frequencies.Oddly enough, the way to get the correct sign is to use the Smith chart itself. Unfortunately, this doesn’t apply in many common cases, including when you are measuring through a transmission line which is probably what most people are doing with this type of test gear. ![]() In a simple case, you’d expect the imaginary part - the reactance - to go down for a capacitive impedance and up for an inductive one. As you might expect, though, he has a solution for you that you can see in the video, below.Ī common method is to increase the frequency slightly. That makes it difficult to plot the results on a Smith chart or carry out other analysis. ![]() notes that a lot of inexpensive test gear like the MFJ-259B gives you complex readings, but fails to provide the sign of the imaginary part of the complex number. The Smith chart is a staple for analyzing complex impedance.
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