Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

How to test a inductor frequency response?

Status
Not open for further replies.
Z

zzm_3392

Junior Member level 2
Junior Member level 2
Joined
May 15, 2006
Messages
21
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,452
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.
 

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.
 

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.
 

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
 

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.
 

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.
 
zzm_3392 said:
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.
Click to expand...

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?
 

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

dlhylton said:
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.
Click to expand...
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
Click to expand...
That article is wrong. In fact the whole website is not very good.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top