Impedance Measurement Using a Current Probe and Siglent Bode Plot II

[graybeard]

This video demonstrates how to measure impedance from 10Hz to 10MHz using a Tektronix P6042 Current Probe, Siglent SDS1104X-E Oscilloscope with Bode Plot II, and a Siglent SDG2042X function generator.  I show examples of impedance plots of resistors, inductors, speakers, and standard and polarized capacitors.  The results are good from 10Hz through 1MHz and usable to 10Mhz.



You can download a copy of the charts and example EXCEL files here

I hope you enjoy this.
Chris

[Chriss]

Thank you for this nice video and post.
I really like it.

My best regards.
Chris.

Sent from my SM-J500F using Tapatalk

[graybeard]

Here is an example impedance curve I measured using the set-up described in the video.


This is the label on the 41 year old bag of capacitors:



This is the capacitor being measured.  You can see the oscilloscope probe connected closest to the device and the force leads at the lead tips.



This is the capacitor impedance curve showing a self resonance frequency of 700KHz.



These are the series R, L, and C values calculated at each frequency from |Z| and phase(Z).

It shows the measured capacitance is the nominal 0.22µF.  The ESR at resonance is ≅0.12Ω which matches the minimum of the |Z| curve.  The ESL is ≅220nH which is the same value you would get from calculating it from the resonance.

Chris