User`s manual

7800 Series Hysteresisgraph System User's Manual
Operation 4-21
Mode 2 Calibration (Continued)
NOTE: To further increase the precision of the calibration, make the distance of the air gap in the
electromagnet the same as the height of the intended sample.
4. Click the AutoSet button to start generation of H Field in electromagnet gap.
5. When the AutoSet process is complete, click the Accept button. This ends Mode 2 calibration.
4.2.3 Mode 3 Calibration (Material Standard)
Mode 3 calibrates to a physical flux reference standard in addition to the Mode 2 calibration procedure.
Reference standards of high purity nickel or other materials that are traceable to known and accepted standards
are generally used. use of a standard that approximates dimensions of test samples minimizes geometry-based
distortion in the measurement process.
1. Repeat Paragraph 4.2.1, Steps 1 thru 10, and Paragraph 4.2.2, Steps 1 thru 5. When these steps are
successfully completed, you will see the following 7800 Message:
2. Following the instructions in red text, remove the Hall probe from the electromagnet gap, place the sensing
coil at a point of minimum flux (hold in a vertical orientation away from the electromagnet), then click the
OK button. Clicking the Cancel button at any time will cancel the Mode 3 calibration and return you to the
normal display.
3. Center the B coil inside the electromagnet gap, then click the OK button.
4. Remove the sensing coil from the electromagnet then click the OK button. The AutoCalibrate H Coil
display is displayed next.