sauter HK-D, Инструкция по эксплуатации

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HK-D_HK-DB-BA-e-2020 13
- Weighing down the test piece: this is not necessary for heavy test pieces. Medium-
heavy objects are placed on a smooth and stable surface. The test piece should be
placed absolutely flat and without wobbling.
- A sufficient material thickness of the test piece is required, as well as the minimum
material thickness.
- As for the hardened surface coating of the test piece: the thickness of this should also
meet the requirements of Table 3.
- Coupling: Very light test pieces should be firmly coupled to a heavy base plate. Both
of these surfaces to be coupled must be flat and smooth and coupling agent may be
left behind. The rebound direction is vertical to the coupled surface. If the sample is a
large plate, long rod or bent, it may be deformed and become unstable, even though
the weight and strength are sufficient, and consequently the test values will not be
accurate. Therefore, the test piece should be reinforced or supported on its back.
- Magnetism of the test piece itself should be less than 30 Gauss.
System settings of the hardness tester
Specific procedure for the setting: see Chap.6.9
Setting the measurement conditions of the tester
Specific procedure for the setting: see Chap.6.5
5.3 Test procedure
The hardness tester should be checked with a standard hardness test block. The
ERROR value and the repeatability of the value to be read are given in Table 5 in the
Appendix.
Note: The hardness value of the standard hardness test block can be measured with
a Leeb hardness tester which has been calibrated; 5 measurements should be taken
vertically downwards. This should be used to calculate the arithmetic mean and this
can then be taken as the hardness value of the standard test block. If the value
exceeds the standard range, the instrument can be calibrated for the user using the
calibration function.
Connection sensor to display unit
- The rebound sensor plug is inserted into the socket of the rebound sensor in the
measuring instrument.
- The power button
is pressed and the unit is ready for testing.
Shop
- The loading tube is pushed down to lock the rebound body in place; with the DC
Rebound Sensor, the load bar can be placed on the surface to be tested, then the DC
Rebound Sensor is inserted into the load bar until the stop position. This completes
the loading process.