User`s manual
7800 Series Hysteresisgraph System User's Manual
4-6 Operation
System Setup (Continued)
B Surrounding Coil + Hall Probe for H An air core sensing Probe with two coils (B and H) oriented in a
side-by-side configuration. The flux from the B coil will be integrated by a single
fluxmeter. H will be acquired via a Hall effect probe and Gaussmeter. B and H will
be mathematically summed to form (B-H). (B-H) = B + H)
Pre-Magnetization Automatically magnetize samples in electromagnet yoke when test begins?
Yes, Magnetize Sample Sample will be magnetized by electromagnet into the first quadrant.
No, Do NOT Magnetize Sample Sample will not be magnetized by electromagnet into the first quadrant.
2
nd
Quadrant (Demag Curve) Measurement run consists of magnetization (if chosen) followed by sample
demagnetization. Measurement is finished when B-H=0 or Negative Field Limit is
reached.
4 Quadrants (Hysteresis Loop) Measurement run consists of magnetization (if chosen) followed by sample
demagnetization and continues until the Negative Field Limit is reached. Then,
sample is magnetized again until the Positive Field limit is reached.
Recoil Loop (Requires Manual Power Supply Control Special measurement mode. Typically, the
measurement begins with magnetization to saturation and return to zero current.
Next, the sample is demagnetized slightly and brought back to zero applied field.
Forming a recoil loop. This demag/return to zero applied field process (or loop) is
repeated as needed. The result is a family of recoil loops. Parameter extraction
remains intact. Requires Semi-Automatic or Manual power supply control mode.
Curve Tracing (General B/B-H vs. H Plotting) In this mode, no parameter extraction is available. The
system will simply plot the B and/or (B-H) curve in response to the changes in
applied field, H. Requires Semi-Automatic or Manual power supply control mode.
4.1.3.2 Calibration Setup
Calibration Applied Field, H Hcal, or the value of applied field, H, which will be used to calibrate the H
sensing coil. A uniform applied field, of the value Hcal, will be generated in
the air gap of the Electromagnet. The H sensing coil will be taken from a
point of near-zero flux and placed in the uniform field of the electromagnet
gap. This change in flux will be used as a reference to calibrate the H
sensing Coil.