Measuring Le

thatvan · 28th October 2004, 08:24 AM

Maybe I'm an idiot but I cant figure an easy way to do it. I have access to most test equipment so that is not an issue. Please dont link the soundhost page because that is where I was tring to figure it out from. Any help would be most welcome!

Ian

GM · 28th October 2004, 07:50 PM

Calc it, that's what measurement programs do AFAIK:

Le(mH) = [(Zxo^2-DCR^2)^0.5/(2*pi*Fxo)]*1000

Where:

Fxo = some frequency point well away from Fs
Zxo = impedance at Fxo
Dcr = Re

GM

Timn8ter · 28th October 2004, 08:05 PM

Wouldn't an LC meter work?

Lsharptec1 · 29th October 2004, 06:25 PM

Timinator, an LCR meter will measure the inductance of the coil, but you have to find a way to lock the cone to prevent it from moving when the LCR meter voltage is applied.

Larry

GM · 29th October 2004, 09:46 PM

Yes, you can use a meter to measure it if you have one.

Why would you want to measure the driver when locked down? I mean what we want to know is its inductance at some frequency to allow us to accurately design a zoebel and/or XO ckt., so we want the driver moving at this frequency when we measure it.

GM

thatvan · 29th October 2004, 10:03 PM

I found this site. Testing setup and meathod fairly straight up. Is 1000Hz pretty std for Le measurments?

http://www.webervst.com/spkrcalc/para.htm

Thanks everyone!
Ian

Timn8ter · 29th October 2004, 10:09 PM

Quote:

Originally posted by GM
Yes, you can use a meter to measure it if you have one.

Why would you want to measure the driver when locked down? I mean what we want to know is its inductance at some frequency to allow us to accurately design a zoebel and/or XO ckt., so we want the driver moving at this frequency when we measure it.

GM

That's what I was wondering. These are "dynamic" drivers aren't they?

28th October 2004, 08:24 AM	#1
thatvan diyAudio Member Join Date: Oct 2004	Measuring Le Maybe I'm an idiot but I cant figure an easy way to do it. I have access to most test equipment so that is not an issue. Please dont link the soundhost page because that is where I was tring to figure it out from. Any help would be most welcome! Ian

28th October 2004, 07:50 PM	#2
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Calc it, that's what measurement programs do AFAIK: Le(mH) = [(Zxo^2-DCR^2)^0.5/(2piFxo)]*1000 Where: Fxo = some frequency point well away from Fs Zxo = impedance at Fxo Dcr = Re GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

29th October 2004, 09:46 PM	#5
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Yes, you can use a meter to measure it if you have one. Why would you want to measure the driver when locked down? I mean what we want to know is its inductance at some frequency to allow us to accurately design a zoebel and/or XO ckt., so we want the driver moving at this frequency when we measure it. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

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28th October 2004, 08:05 PM	#3
Timn8ter diyAudio Member Join Date: Jul 2003 Location: Seattle, WA	Wouldn't an LC meter work?

29th October 2004, 06:25 PM	#4
Lsharptec1 diyAudio Member Join Date: Oct 2004	Timinator, an LCR meter will measure the inductance of the coil, but you have to find a way to lock the cone to prevent it from moving when the LCR meter voltage is applied. Larry

29th October 2004, 10:03 PM	#6
thatvan diyAudio Member Join Date: Oct 2004	I found this site. Testing setup and meathod fairly straight up. Is 1000Hz pretty std for Le measurments? http://www.webervst.com/spkrcalc/para.htm Thanks everyone! Ian

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