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Old 28th October 2004, 08:24 AM   #1
thatvan is offline thatvan  United States
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Default 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
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Old 28th October 2004, 07:50 PM   #2
GM is offline GM  United States
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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
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Old 28th October 2004, 08:05 PM   #3
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Wouldn't an LC meter work?
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Old 29th October 2004, 06:25 PM   #4
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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
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Old 29th October 2004, 09:46 PM   #5
GM is offline GM  United States
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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
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Old 29th October 2004, 10:03 PM   #6
thatvan is offline thatvan  United States
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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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Old 29th October 2004, 10:09 PM   #7
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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?
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