How to test a inductor frequency response?

[zzm_3392]

Hi, all. I made a air-coil inductor. How to test its frequency response, or can anyone give me some advices to do a test circuit?
Thanks.

 

[barry]

Depending on how fancy/accurate you want to be, you could just make a series R-L circuit and hook it up to a signal generator. One side of R goes to the generator; other side of R goes to one side of the inductor, the other side of the inductor goes to common. (You now have a voltage divider). Now, sweep the generator and monitor the voltage across the inductor as the frequency changes. This is fairly crude, but also really easy.

 

[zzm_3392]

Barry, thank you. I actually want to test the Impedance vs. Frequency characteristic. As we known, the equivalent circuit of inductor is a inductor parallel with capacitor, then series with a resistor. I particularly care the parallel resonant frequency and the impedance at nearby this frequency.

 

[dlhylton]

You can just connect the inductor to a function generator and also to an ohmmeter of a multimeter. As you increase the frequency of the signal, the resistance should increase, so it's a frequency response testing.

Check out the resource below, as it contains a circuit and explanation of this circuit:
http://www.learningaboutelectronics.com/Articles/How-to-test-an-inductor

 

[FvM]

The question is too general for a reasonable answer, the self resonance frequency can be in a several 100 kHz up to GHz range, depending on the size and number of turns. Available measurement options are quite different.

 

[szhighstar]

if SRF is below 3M, please use WK3260, the meter can automatic display SRF.
if SRF is above 3M, please use HP4287A, when impedance value is the highest, test frequency value is SRF.

 

[The Electrician]

Barry, thank you. I actually want to test the Impedance vs. Frequency characteristic. As we known, the equivalent circuit of inductor is a inductor parallel with capacitor, then series with a resistor. I particularly care the parallel resonant frequency and the impedance at nearby this frequency.

What equipment do you have available? Do you have a signal or function generator that can generate a sine wave at frequencies up to the megahertz range? Do you have an oscilloscope?

 

[szhighstar]

no, we do not have function generator, we test SRF using WK3260 and HP4287A, testing value is very precision.

 

[godfreyl]

You can just connect the inductor to a function generator and also to an ohmmeter of a multimeter. As you increase the frequency of the signal, the resistance should increase, so it's a frequency response testing.

Sorry, that won't work.

Check out the resource below, as it contains a circuit and explanation of this circuit:
http://www.learningaboutelectronics.com/Articles/How-to-test-an-inductor

That article is wrong. In fact the whole website is not very good.