ASTM A340-03a

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Designation: A340 – 03a
Standard Terminology of
1
Symbols and Definitions Relating to Magnetic Testing
This standard is issued under the fixed designation A340; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
In preparing this glossary of terms, an attempt has been made to avoid, where possible, vector
analysisanddifferentialequationssoastomakethedefinitionsmoreintelligibletotheaverageworker
in the field of magnetic testing. In some cases, rigorous treatment has been sacrificed to secure
simplicity, but it is believed that none of the definitions will prove to be misleading.
It is the intent of this glossary to be consistent in the use of symbols and units with those found in
ANSI/IEEE 260-1978 and USA Standard Y10.5-1968.
Part 1—Symbols Used in Magnetic Testing
Symbol Term H biasing magnetic field strength
b
H coercive field strength
c
a cross-sectional area of B coil H intrinsic coercive field strength
ci
A cross-sectional area of specimen H coercivity
cs
A8 solid area H demagnetizing field strength
d
H incremental magnetic field strength
magnetic induction D
H
B magnetic flux density H air gap magnetic field strength
g
H ac magnetic field strength (from an assumed
L
DB excursion range of induction
peak value of magnetizing current
B · biased induction
b
H maximum magnetic field strength in a
m
B remanent induction
d
hyster esis loop
B remanence
dm
H maximum magnetic field strength in a
max
B H energy product
d d
flux- current loop
(B H ) maximum energy product
d d m
H ac magnetic field strength (from a measured
p
B incremental induction
D
peak value of exciting current)
B intrinsic induction
i
H instantaneous magnetic field strength (coinci-
t
B maximum induction in a hysteresis loop
m
dent with B )
max
B maximum induction in a flux current loop
max
H ac magnetic field strength force (from an as-
z
B residual induction
r
sumed peak value of exciting current)
B retentivity
rs
I ac exciting current (rms value)
B saturation induction
s
I ac core loss current (rms value)
c
cf crest factor
I constant current
dc
CM cyclically magnetized condition
I ac magnetizing current (rms value)
m
d lamination thickness
J magnetic polarization
D demagnetizing coefficient
B
k8 coupling coefficient
df distortion factor
, flux path length
D magnetic dissipation factor
m
, effective flux path length
1
E exciting voltage
, gap length
g
E induced primary voltage
1
+ (also f N) flux linkage
E induced secondary voltage
2
+ mutual flux linkage
m
E flux volts
f
L self inductance
f cyclic frequency in hertz
L core inductance
1
^ magnetomotive force
L incremental inductance
D
ff form factor
L intrinsic inductance
i
H magnetic field strength
L mutual inductance
m
DH excursion range of magnetic field strength
L initial inductance
0
L series inductance
s
L winding inductance
w
1
m magnetic moment
This terminology is under the jurisdiction of ASTM Committee A06 on
M magnetization
Magnetic Properties and is the direct responsibility of Subcommittee A06.92 on
m total mass of a specimen
Terminology and Definitions.
m active mass of a specimen
1
Current edition approved June 10, 2003. Published July 2003. Originally
N demagnetizing factor
D
approved in 1949. Last previous edition approved in 2003 as A340–03. DOI:
10.1520/A0340-03A.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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A340 – 03a
N turns in a primary winding g proton gyromagnetic ratio
1 p
N turns in a secondary winding G magnetic constant
2 m
N I/, ac excitation d density
1 1
p magnetic pole strength k susceptibility
3 permeance ac Permeabilities:
P active (real) power µ ideal permeability
a
P apparent power µ inductance permeability
a L
P specific apparent power µ L incremental inductance permeability
a (B;f) D
µ initial dynamic permeability
0d
P total core loss µ peak permeability
c p
P specific core loss µ incremental peak permeability
c (B;f) Dp
µ instantaneous permeability
i
P incremental core loss µ impedance permeability
cD
z
P normal eddy current core loss
µ incremental impedance permeability
e Dz
P incremental eddy current core loss dc Permeabilities:
De
P normal hysteresis core loss µ normal permeability
h
P incremental hysteresis core loss µ absolute permeability
Dh abs
P reactive (quadrature) power µ differential permeability
q d
P residual core loss µ incremental permeability
r D
P winding loss (copper loss) µ effective circuit permeability
w eff
P exciting power
µ intrinsic permeability
z i
P specific exciting power µ incremental intrinsic permeabili
...