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20th July 2021, 10:33 PM  #1 
diyAudio Member
Join Date: Jan 2019

Finding the inductance of a coil with a soundcard ?
Hi,
I'm playing with Limp to measure the impedance VS frequency of a coil with an Arta box, but is someone is aware of a shareware to find the inductance value of an unmarked coil, please ?
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Pi VII au bord du Pô. 
20th July 2021, 11:47 PM  #2 
diyAudio Member
Join Date: Feb 2009
Location: Melbourne, Oz

REW has an impedance measurement function which I have used  it is accurate and can measure over a wide range of inductances (I've confirmed from 10uH to over 100H). Maybe other software tools have a similar function.
Impedance Measurement Last edited by trobbins; 20th July 2021 at 11:50 PM. 
21st July 2021, 12:26 AM  #3 
diyAudio Member
Join Date: Jan 2019

many thanks, trobbins. I didn't know that and that's a good thing as I have to dive a little in REW after Xsim
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Pi VII au bord du Pô. 
21st July 2021, 04:53 PM  #4 
diyAudio Member
Join Date: Feb 2012
Location: Croatia

While you measure impedance of any inductor, Limp is supposed to show the value of a reactive component, and that is its inductance. At least, I remember Limp doing that while I was trying out stuff years ago.
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21st July 2021, 06:02 PM  #5 
diyAudio Member
Join Date: Jan 2019

When i mesure a voice coil and i click on RLC he gives the inductance in the highs frequencies only but don t give me any inductance for the voice coil. I measured... a 4 h and just have a ohm value related to the frequency.
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Pi VII au bord du Pô. 
21st July 2021, 09:20 PM  #6 
diyAudio Member
Join Date: Feb 2012
Location: Croatia

That region of higher frequencies is the region of inductive reactance and this is exactly what you are trying to find, a voice coil inductance at certain frequency.
You can calculate yourself inductance value as long as you have Z(ohms) and phase angle (degrees) defined. Xl=Z*sin(phase angle); Xl=inductive reactance Xl=2*pi*f*L; pi=3.14159; f=frequency in Hz; L=inductance in Henries
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21st July 2021, 10:11 PM  #7 
diyAudio Member
Join Date: Jan 2019

Cool. LIMP is showing the phase.
Thanks
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Pi VII au bord du Pô. 
22nd July 2021, 12:36 AM  #8 
diyAudio Member
Join Date: Feb 2009
Location: Melbourne, Oz

I can indicate that the REW plot of impedance amplitude and phase allows the calculated inductive component to be read from the plotted curve (by placing the mouse pointer at the point you are interested in), and so the value will change with frequency (eg. approach DCR at low frequency), and will change to a capacitive value past the first resonance. REW also separately displays the equivalent model parameters, if valid. Often for comparison a particular frequency is typically chosen for certain part parameters like choke inductance (eg. 100Hz), or output transformer leakage inductance (eg. 1kHz), so the measurement frequency should really be stated when an inductance value is stated.

23rd July 2021, 09:29 AM  #9 
diyAudio Member
Join Date: Jan 2019

Do you think one can use the Arta Box to plug the coil ?
I don't find in the menu jow to measure the coil.
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Pi VII au bord du Pô. 
23rd July 2021, 04:58 PM  #10 
diyAudio Member
Join Date: Feb 2012
Location: Croatia

Any system designed to measure impedance of a loudspeaker, can measure impedance of an inductor, capacitor, resistor or a passive network, etc. You seem to struggle with something that is supposed to work simple.
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