12
conventional support ring should be used.
workpiece supporting
—— Support is not necessary for heavy test workpiece
—— The workpiece with medium weight must be placed on flat and
solid plane, and it must be placed stably without any shaking.
Enough thickness of workpiece is necessary, and the min. thickness
should comply with the specification in table 3.
As for test piece with hardened surface layer, the depth of hardened
layer should comply with table 3.
Coupling
——The workpiece with lightweight must be firmly coupled with the
support; both coupled surface must be flat, smooth and the coupling
agent should not be too much. The measuring direction must be vertical
to the coupled surface.
——When the workpiece is a large area plate, long rod or bending piece,
it can be deformed and become unstable even the weight and the
thickness is heavy and the test value may not be accurate. So it should
be reinforced or supported at the back of the workpiece.
Self magnetism of workpiece should be less than 30 Gauss.
4.1.2 System setting of tester
Specific procedures for setting, refers to 6.9.
4.1.3 Measuring condition setting of tester
Specific procedures for setting, refers to 6.5.
