9 10
be turning off automatically, and the display unit will be shut off in
3 minutes.
If the display unit isn't working properly or halt, users can press
the “Reset” button by insert a slender rod into the reset hole at the
backside of display unit, and then the display unit will be
shutdown. Press the button to reboot the system.
5
System reset :
After using 1000-2000 times, users should clean the catheter of
impact device and impact body with nylon brush, and screw off
the supporting ring before clean the catheter, and then take out
the impact body, rotate the nylon brush into the tube in an anti-
clockwise direction, and pull out when touching the bottom. So
repeatedly, and then load up the impact body and supporting ring;
Users should release the impact body after use. And the lubricant
is banned.
In calibration of the hardness tester, if finding that error is larger
than 6HLD, users must be renew the steel ball or impact body,
because the reason may be that the steel ball or impact body is
wore out to lead to failure in operation.
Maintenance
1
2
Impact Device Maintenance:
Normal Maintenance Procedures:
energy. Accordingly, the roughness of sample testing points on the
surface Ra≤ 1.6.
2) The shape of sample surface
Leeb testing principle demands the velocity of rebound and impact
are on the same line, because the impact body is moving in a metal
tube. Even if the velocity of rebound and impact are not on the same
line, it also can show hardness for sure, but the impact body would
collide with tube wall when it rebounds, which will affect the velocity
of rebound. Therefore, a greater error is on test accuracy. When the
radius of curvature of the testing sample surface is smaller, the
solution is the use of suitable variant supporting circle. If users
require special supporting circle, we can contribute to design and
process.
3) The weight of the sample
If the sample weight must be larger than or equal to 5kg, and not
easily sway. If the sample weight were less, the sample would need
proper treatment (It is necessary to increase the supporting or
mounting through coupling compress on larger weight testing stand),
and the testing results can be achieved in accuracy. There should be
a certain area at the testing points (the area required to meet a set of
testing points) and no vibration or shaking. If the weight is not
enough, users must be as much as possible reduce the jitter and
sloshing by the methods of increasing supporting, coupling and
compressing. And supporting device should avoid shock.
4) The sample stability
Any effective tests need to minimize possible interference from
outside; it's more important to dynamic measure such as Leeb
hardness test. Therefore, measuring only allowed in stable hardness
testing system. If it's likely to lead to sample movement in the tests,
users should fix it before testing.
Factors Affection Accuracy
Incorrect operation or improper testing conditions would have
serious impact on testing accuracy. Following is several common
factors effect the accuracy of testing for the use of reference:
1) Roughness of sample surface
When the impact body impact on the sample, a small pit would arise
on the sample surface, so at the same time, should finish the surface
of the sample. The more roughness, the less consumption of impact
energy whereas the less roughness, the more consumption of impact
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