Calculation Of Sample Constants - Iwatsu SY-8218 Instruction Manual

■

4.2 Calculation of sample constants

● If a sample constant required for measurement is not attached to the sample, use the following calculation expression to obtain an approximate
constant. For details, see JIS standard and the like.
■
Toroidal core
For a toroidal core with the shape shown in Fig.4-2, use the following
calculation expression to obtain the sample constant:
Effective length of magnetic path:
Effective net core area:
Effective volume:
W
Mass:
■
EI core
For an EI core with the shape shown in Fig.4-3, use the calculation
expression to obtain the sample constant:
Effective length of magnetic path:
A
Effective net core area:
e
Effective volume:
V
e
W
Mass:
e
 


d D

L
e
2
 

D d h

A
e
2
 
V L A
e e e

 
V
e e
   
L a 2 b c
e
 
d h
(4.6)
 
(4.7)
L A
e e

 
V (4.8)
e
(4.1)
(4.2)
(4.3)
Cross section
(4.4)
d
 
(4.5)
e f
2
Cross section
18
B-H ANALYZER SY-8218 / SY-8219
D: Outer diameter
Ｄ
d: Inner diameter
d
Le: Effective length of
L
Ae: Effective net core area
e
Ρ:
h:
A
e
Fig.4-2 Toroidal core
b
e
Fig.4-3 EI core
magnetic path
Density
Height
ρ: Density
h: Height
f