How can I plot Z for a set of chokes?

  • Thread starter Thread starter hobbs125
  • Start date Start date
  • Tags Tags
    Plot Set
Click For Summary

Discussion Overview

The discussion revolves around measuring and plotting the impedance of a set of chokes across specific frequency ranges, initially proposed at 10 kHz and later adjusted to 30-40 kHz. Participants explore methods and circuit configurations to achieve this measurement using available equipment.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant seeks methods to measure and plot impedance across a frequency range of 10 kHz using a frequency generator, variable power supply, and oscilloscope.
  • Another participant questions the need for a frequency range if only the impedance at 10 kHz is required, prompting a discussion about the RL circuit equation for voltage output.
  • A different participant expresses a desire to measure impedance specifically from 30-40 kHz and plot it against frequency.
  • In response, a suggestion is made to use an RL circuit configuration and to measure voltage at different points to calculate attenuation and phase shift, which may assist in selecting appropriate resistor values.

Areas of Agreement / Disagreement

Participants have differing views on the frequency range needed for the impedance measurement, with some focusing on a specific frequency (10 kHz) while others propose a broader range (30-40 kHz). The discussion remains unresolved regarding the optimal approach and configuration for the measurements.

Contextual Notes

There are unresolved assumptions regarding the specific circuit configurations and the mathematical relationships involved in measuring impedance across the proposed frequency ranges.

hobbs125
Messages
108
Reaction score
0
Hello everyone,

I need to find a way to measure and plot the impedance of a set of chokes across a frequency range of 10kHz. Any ideas how I can do that? I have a frequency generator, a variable power supply and an oscilloscope with a spectrum analyzer.
 
Engineering news on Phys.org
hobbs125 said:
Hello everyone,

I need to find a way to measure and plot the impedance of a set of chokes across a frequency range of 10kHz. Any ideas how I can do that? I have a frequency generator, a variable power supply and an oscilloscope with a spectrum analyzer.

If you just need the Z at 10kHz, then there is no frequency range involved. What is the equation for Vout/Vin for an RL circuit? How can you apply that now? :smile:
 
I want to actually measure the impedance from 30-40 kHz and plot it against the frequency.
 
hobbs125 said:
I want to actually measure the impedance from 30-40 kHz and plot it against the frequency.

Then just use an RL circuit. Put your oscilloscope probe #1 at the output of the signal generator before the R, and probe #2 between the R and L (far side of L goes to ground). Work out the math for the attenuation and phase shift versus frequency, to help you choose a good value of R for a given L.
 

Similar threads

  • · Replies 58 ·
2
Replies
58
Views
9K
  • · Replies 5 ·
Replies
5
Views
3K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 12 ·
Replies
12
Views
2K
Replies
12
Views
4K
  • · Replies 9 ·
Replies
9
Views
2K
  • · Replies 1 ·
Replies
1
Views
1K
Replies
20
Views
3K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 4 ·
Replies
4
Views
6K