User`s manual

7800 Series Hysteresisgraph System User's Manual
4-16 Operation
Data Processing (Continued)
Hk value Check to display Hk, the Knee Shape parameter.
Kf Knee Factor Check to display Kf, the Knee Factor.
SQR Squareness Check to display the squareness (SQR).
User Defined Parameter 1 Check to display the User Defined Parameter 1.
User Defined Parameter 2 Check to display the User Defined Parameter 2.
4.1.6.3 Permeance
Permeance lines (Load lines) may be drawn on the B, H graph. Load lines are graphical representations of
demagnetization effects (-Hd) arising in a given magnetic circuit. The sum (or a portion) of these effects may
be represented by load lines.
A load line is graphically portrayed as a straight line drawn from the origin of the B,H axes to the intersection
of the B versus H demagnetization curve and the line defined by H = -Hd. That intersection being defined as
the point (-Hd, Bd). The slope of this line is: m = Bd/-Hd. And the equivalent point on the Intrinsic curve, (B-
H) versus H, being (-Hd , (B-H)d).
Due to the inherent relationship amongst the these four parameters – slope, Bd, (B-H)d and -Hd, finding the
value of any of these four parameters, once the demagnetization curve has been determined, requires
knowledge of only one of these parameters. e.g., Given Bd, we can determine slope, (B-H)d and -Hd. Given
slope, we can determine Bd, (B-H)d and -Hd, etc.
Therefore, to have the system calculate a load line for a particular demagnetization curve, simply enter any of
the four parameters, slope, -Hd, Bd or (B-H)d as the known parameter. The system will determine the value of
the remaining parameters automatically.
Extract Parameters for Permeance Line 1 Select this box if you want to display Permeance line 1.
Type Enter the type of parameter you wish to enter: slope, Bd, (B-H)d, or -Hd
Value Enter the value of this parameter.