Tech Support
12
Macro
Vickers
Model
No.
900
‐
398
Hardness
Tester
3.5
The regulation of the hardness tester and the precautions for the operation
.
3.5.1 The square pyramidal diamond indenter
a.)
The diamond indenter and the indenter shaft are important parts of the instrument, and
hence it is necessary to take care not to touch the indenter during the operation.
b.)
In order to assure the precision of the measurement, it is important to keep the indenter
clean. If it is covered with grease or dust, it should be cleaned carefully.
c.)
The round column of the indenter is marked with a red dot. Make sure the RED dot on the
indenter is facing the frontal direction when it is installed and the focus of the diagonal
line of the indention should be aligned with the red dot. It is possible to make the
alignment of the cross-shaped in the micro eyepiece line with the diagonal line of the
indentation. If the indention observed is not aligned with the cross-shaped line, please
unscrew the screw on the indenter, turn the indenter a bit and the fasten the screw, and
then make the alignment again through tests until the alignment is all right to your
satisfaction (See Fig 3)
3.5.2
The micro eyepiece
a) Every observer should adjust the lens in front of the micro eyepiece according
to his personal visional line so as to make the graduated line observed in the
vision field clear. Turn up-and-down rotating wheel slowly until the block or
specimen surface forms clear image in micro eyepiece. Then set zero to micro
eyepiece as Item 3.4.11. (Every testing operator should set zero according to
of his personal visional line.)
b) As the micro eyepiece is put in the micro eyepiece tube, it is necessary to turn
the micro eyepiece by 90
º
during the measurement of the two diagonal lines
of the indentation. During the turning operation, the micro eyepiece should
move along the inner side of the tube without any space between them;
otherwise it would affect the correctness of the measurement.
.
Fig 3
