FORMULA

               VRMS x 108               

  B =         [Gauss]

             4,44 x f x N x Ae

   .Sine Wave

                1         Lim         D B

 mi =          DH® 0   

                 mo                    D H

              VRMS x 108          

  B =         [Gauss]

             4 x f x N x Ae

   Obs.: Onda Quadrada

               AL x S   I / A

  me @  

              ......... .mo

               ....0,4 x p x N x I DC       

  HDC=         [Oe]

                         ...... Le

              ..... L        

  AL =         [nH]

              .... N2

 

  B £ 0,25 mT or 2,5 Gauss

        1,41 x 0.4 x p x N x I RMS        

  H        [Oe]

                        . Le

      
Where:
H = Field strength          [Oe]
B = Flux Density            [Gauss]
L = Indutance                [nH]
AL = Indutance Factor           [nH]
I/A = Core Factor            [cm-1]
Le = Effective Length           [cm]
Ae = Effective Area            [cm2]
mi = Initial permeability
me = Effective Permeability
VRMS = Volts RMS      [V]
IDC = DC  current      [A]
IRMS = RMS current [A]
f = Frequency          [HZ]
N = Nbr. of turns
mo = 12.57           [nH/cm]
Measurement conditions of AL : B £ 0,25 mT or 2,5 Gauss
f = 4 to10 Khz