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sampathautomotive
Participant

Join Date: Jan 2011
Posts: 3

Inductance Testing Mode

01/11/2011 12:40 AM

We are one of the manufature of Magnetic components like common mode chokes, inductors and transformers.

For most of the common chokes we are carry out testing for the Inductance measurements at parallel inductance mode( Lp) by using ferrite cores which is having the AL value and Permeabilty level as 5000nH and 8000 respectively.But while using the Nanoperm core material which is having the permeabilty level ~25,000 and our core supplier recommended to test the inductance at series inductance(Ls) mode instead of parallel inductance mode.

Can any one please advice on what basis we have to select the mode of testing(Lp/Ls) ?

P.S.Kumar
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BruceFlorida
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Join Date: Jul 2008
Posts: 1688
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#1

Re: Inductance Testing Mode

01/11/2011 7:40 PM

Interesting question. I am surprised that no one has responded yet.

I would guess that either characteristics of the core or effects of the capacitance of the windings would cause the core being evaluated to perform more favorably in one test configuration than the other. This is only a guess and hopefully someone that knows the answer will take a few moments to respond.

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WoodwardDL
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Join Date: Dec 2008
Location: Anthem, AZ
Posts: 392
Good Answers: 8
#2

Re: Inductance Testing Mode

01/12/2011 6:45 PM

I used to work for General Radio (40 years ago), and knew a lot about L-measurements. GR's Inductance bridges were "sold" to QuadTech. There are still people there who know how to test L and C, both parallel and serial.

http://www.quadtech.com/lcr-meter.aspx
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StandardsGuy
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Join Date: Dec 2006
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Good Answers: 106
#3

Re: Inductance Testing Mode

01/12/2011 10:36 PM

Inductors with low Q can read very different in the other mode. This may be the reason, but why not ask the supplier? He would know why he recommended it.

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sampathautomotive
Participant

Join Date: Jan 2011
Posts: 3
#4
In reply to #3

Re: Inductance Testing Mode

01/21/2011 11:14 PM

Thanks for the reply.We are also under discussion with core supplier.
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