Measuring Le

[thatvan]

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]

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]

Wouldn't an LC meter work?

 

[Lsharptec1]

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]

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]

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]

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?