# How can I plot Z for a set of chokes?

by hobbs125
Tags: chokes, plot
 P: 104 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.
Mentor
P: 41,344
 Quote by hobbs125 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?
 P: 104 I want to actually measure the impedance from 30-40 kHz and plot it against the frequency.
Mentor
P: 41,344
How can I plot Z for a set of chokes?

 Quote by hobbs125 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.

 Related Discussions Classical Physics 4 Math & Science Software 1 Math & Science Software 8 Electrical Engineering 3 Math & Science Software 0