Symbol	Unit	Description	Testing Method
A3, A5, A7	A/cm	Amplitude of 3rd, 5th, and/or 7th harmonics of Ht	Tangential magnetic field strength(TMF)
P3, P5, P7	Rad	Phase of 3rd, 5th, and/or 7th harmonics of Ht
UHS	A/cm	Amplitude summation; A3 + A5 + A7 + A9
K	%	Harmonic distortion
Hco	A/cm	Coercive Field Strength, derived from TMF
Hro	A/cm	Upper Harmonics of Ht at zero-crossing
Vmag	V	Amplitude output voltage
MMAX	V	Maximum of the M(H) curve within one cycle	Barkhausen noise(BN)
MMEAN	V	Time period average of the M(H) curve within one cycle
MR	V	Measured value of M(H) at H = 0 A/cm
HCM	A/cm	Coercive Field Strength, derived from the M(H) curve; H = HCM for M = MMAX
DH25M DH50M DM75M	A/cm	Expansion of the M(H) curve at M = 0.25 MMAX, 0.50 MMAX, and 0.75 MMAX
UMAX	V	Maximum of the u(H) curve within one cycle	Incremental permeability(IP)
UMEAN	V	Time period average of the U(H) curve within one cycle
UR	V	Measured value of U(H) at H = 0 A/cm
HCU	A/cm	Coercive Field Strength, derived from the U(H) curve; H = HCU for U = UMAX
DH25U DH50U DM75U	A/cm	Expansion of the U(H) curve at U = 0.25 UMAX, 0.50 UMAX, and 0.75 UMAX
Re1–Re4	V	Real part of the EC signal at Frequency No. 1, 2, 3, and 4	Multi-frequency Eddy Current (EC)
Im1–Im4	V	Imaginary part of the EC signal at Frequency No. 1, 2, 3, and 4
Mag1–Mag4	V	Value of the EC signal at Frequency No. 1, 2, 3, and 4
Ph1–Ph4	Rad	Phase of the EC signal at Frequency No. 1, 2, 3, and 4