Iwatsu SY-8218, Инструкция по эксплуатации

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B-H ANALYZER SY-8218 / SY-8219
8
■
2.2 Expressions to calculate measurement values
● The following is explanation of expressions to calculate values measured by this product.
This product uses two measurement modes of Normal mode and
μ mode ,
and Table 2-1 shows measurement values displayed in each
calculation mode.
The calculation difference point of Normal mode and
μ mode is the following. In μ mode, the complex permeability from fundamental wave
element of intensity of the magnetic field H and magnetic flux density B is calculated. In Normal mode, the value which is not calculated by using
them is calculated. Refer to the following expressions for details
Table 2-1 Calculation modes and measurement values

Units in [ ] are typical. The symbol to which * adheres is calculated from the fundamental wave element.
Calculation
modes
Normal mode μ mode
Symbol
Typical
unit
Meaning Symbol
Typical
unit
Meaning
Measureme
nt val
ues
Pcv [W/m 3 ] Core loss per volume Bm [T]
Max. magnetic flux
density
Pcm [W/kg] Core loss per mass V
2
m [V] Max. induced voltage
θ [deg] Phase angle Hm [A/m] Max. magnetic field
μ
a
－
Relative permeability I
1
m [A] Max. exciting current
Bm [T]
Max. magnetic flux
density
μ
a
－
Relative permeability
V
2
m [V] Max. induced voltage ＊ L [H] Inductance
Br [T]
Residual magnetic flux
density
＊ R
[ Ω ] Resistance
Hm [A/m] Max. magnetic field ＊ |Z| [ Ω ] Impedance
Hc [A/m] Coercive force Pc [W] Core loss
Pc [W] Core loss
＊
μ′
－
Complex permeability
(real part)
VA [VA] Apparent power ＊ μ″
－
Complex permeability
(imaginary part)
I
1
m [A] Max. exciting current ＊ μ
z
－
Impedance permeability
Br/Bm －
Rectangular ratio
＊ θ
[deg] Phase angle
2 Φ m [Wb]
Total flux linkage
＊ Q －
Quality coefficient
－ － － ＊ tan δ －
Loss coefficient
－ － －
THD [dB] Total harmonic distortion
Expressions used by this product to calculate each value shown in Table 2-1 are as follows:
■
Hm, Hc, Bm, Br, μ
a
, Br/Bm, 2 Φ m
For symbols, see Figure 2-3.
(2.3)
(2.4)
(2.5)
(2.6) Fig.2-3 Hm, Hc, Bm, Br, μ a
H
c
H
c
B
r
B
r
μ
ａ
B
m
B
m
H
m
H
m
2
  
 m m
m
H H
H
2
  

m m
m
B B
B
2
  
 c c
c
H H
H
2
  
 r r
r
B B
B