4
CHANGES AND T YPING ERRORS RESERVED
CHANGES AND T YPING ERRORS RESERVED
4. U
se
See figure 1
Put the material between the anvil and the indenter and press down the handle until you can press it no further.
The dial head now indicates the hardness of the material. Make sure you grip and hold the handle tight while
reading the result.
5. v
erificaTion
and
calibraTion
5.1 v
erificaTion
wiThoUT
maTerial
• Press down the handle whilst there is no material between the indenter and the anvil.
• The dial should indicate 20 HW (+/- 0.5 HW). When this is not the case you must calibrate the hardness tester as
described in paragraph 5.3.
5.2 v
erificaTion
wiTh
TesT
block
• Place the test block between the indenter and the anvil and press down the handle firmly.
• The dial should indicate the value indicated on the test block (+/- 0.5 HW). When this is not the case you must
calibrate the hardness tester as described in paragraph 5.4.
5.3 c
alibraTion
of
The
dial
Figure 3
• Press down the indenter firmly with the handle whilst there is no material between the indenter and the anvil.
• Turn the adjusting screw with the screw driver to the left or the right until the pointer indicates 20 HW.
When the dial cannot be calibrated any more you must replace the indenter. See paragraph 5.5.
5.4 c
alibraTion
of
The
load
spring
See figure 1
• Undo the pivot screw and take out the bottom handle.
• Take out the dial head, but leave the cylinder in the frame. You can now see the adjusting nut.
Figure 4
• Turn the adjusting nut counter clockwise with the wrench when the deviation is < 20 HW, turn it clockwise
when the deviation is > 20 HW.
• By turning the adjusting nut a quarter of a full rotation the pointer on the dial will move 2-3 units either way.
• Put back the dial head, handle and pivot screw and check the hardness tester as described in paragraph 5.2.
Adjusting screw
