1. The residual magnetism measurement utilizes the Hall effect principle, requiring the measuring instrument to have a range of 1mT and an accuracy of ±3%. The specifications of the Hall element equipped with the instrument are 4*2*0.2 cubic meters, with the Hall element plane being 0.05mm away from the surface being measured, both positively and negatively.

For radial ball bearings, the measurement locations are the two end faces and the chamfered areas. The residual magnetic value of the bearing is determined by the obtained*** reading during measurement.

For cylindrical roller bearings, needle roller bearings, spherical roller bearings, tapered roller bearings, and thrust roller bearings, the separable components should be disassembled and measured individually. In addition to measuring the inner and outer rings (or seats, housing) end faces and chamfered areas, the exposed rolling element areas should also be measured. If the residual magnetic area of the rolling element is found at the junction with the retainer, the rolling element can be slightly rotated to expose the area for measurement.

For spherical roller bearings, refer to Section 5.2 for the measurement of both ends and chamfered areas. When measuring the rolling elements, align the radial planes of the inner and outer rings at 90 degrees. The measurement method for rolling elements is in accordance with the provisions of Section 5.3 regarding the measurement of rolling elements.

For thrust ball bearings, the separable washers should be separated for measurement. The measurement points are the seat, the end face of the ring, and the chamfered area. For the measurement methods of non-separable types of such bearings, refer to clause 5.2.

During the measurement of residual magnetism on the bearing end face, the probe should be perpendicular to the bearing end face. When measuring the residual magnetism at the chamfer and rolling elements, the probe may be slightly inclined, but the angle should not exceed 45 degrees.

When the residual magnetism on the bearing ring or rolling element approaches the specified value, the bearing end face should first be placed flat, then measured in the east-west direction to minimize the influence of the Earth's magnetic field.

Do not measure in the presence of magnetic workbench or in an environmental magnetic field stronger than the Earth's magnetic field.

The distribution of residual magnetism on the bearing is random. During measurement, the probe's position on the bearing cannot be pre-set. The probe's movement should allow it to reach any measured area on the bearing. The method of fixing the probe for measurement is not applicable to this standard.