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hi jbartos Thanks for the website.

Hi [b]fbjavier[/]: Thanks for the advice. :)

hi all: I need some time to "digest" all your ideas...haha...I am still a newbie. I have to read a few times to understand a little bit. Appologize for my stupidity. What my boss have in mind is a test that can be conducted on the voice coil for about 2 to 3 seconds. We got around 9 production...

Hi IRstuff: U mean u suggest I use a shaker to shake the coil during test ? I don't quite understand the "$60,000/yr wages/bennies/G&A". Sorry, can you pls explain ? I don't have the exact number of voice coils to be test, but I think it is around 500k per month. Thank you.

The main problem now is how to check the voice coil for [/b]intermittent short-circuit[/b] and intermittent open-circuit. I think both is related.

Hi MacGyverS2000 I totally agree with you. But I am just a tiny person in the company. They gave me this problem to settle, I cannot just tell them to find a better supplier and make sure the supplier supply 100% good products. My job is to design or find something to can detect the intermittent...

Hi fbjavier: Thank yuo for replying my question. The DC resistance of the voicce coil is around 1.x to 4.x . The Wagne Kerr representative claimed that their tester will not damage the voice coil and still can detect the intermittent cases. He din mention about adding anything to the coil. U...

I think submerging the coil into water won't detect inner layer's short. The coil I need to test actually come from supplier. They already did DCR test and open-circuit test. But they couldn't detect intermittent ones. The failing rate is low, BUT one out of ten thousand is still a problem...

Hi OperaHouse: Forgot to mention, these Surge tester company claimed that their testers can test for intermittent cases, is it true ?? And they claim that the high voltage surge won't damage/predamage the coil, is it true ? What is the life-span of these tester ? Calibration, service or repair...

Hi OperaHouse: The better test that u said is a "surge/impulse test" , is it ? I found a few tester company like Baker and Wagne Kerr selling this kind of tester. But the thing is these testers are expensive and I don't know how effient they are. The test is it fool proof ? I heard that the...

Hi guys, I am new in industry. I din know much about motor. Can I ask whether I can use surge test for voice coil ? The voice coil is for speaker. The wire is very thin, like 0.12 or 0.08 mm. Can I use surge test to test whether there is any short-circuit or open-circuit (even intermittent...

A big THANK YOU to all you guys for the fast and nice replies. :) Hi OperaHouse: I have to test the coil before it is assembled to be a speaker,that's why i mentioned "raw part". If I use the method you said, How should I decide the good and defect differences using the AC milivolt meter ? The...

Hello BrianG: Can you give some example of these bridges that you mentioned? I agree that a short-turn will decrease the inductance and resistance. BUT an intermittent short-circuit is the main problem. It sometimes show , sometimes doesn't show and, sometimes only show when it is assembled to...

I am dealing with voice coil. How can I detect a voice coil whether it has any short-circuit or open circuit defect ? My main concern here is intermittent cases, eg. intermittent short/open (sometimes short, sometimes open, some only can be reveal after it is assembled to be a speaker and full...