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Portable hardness tester
Oct 15, 2018

Portable hardness tester


Let's talk about the measurement steps of the portable hardness tester.


The instrument may be inspected prior to measurement using a random standard Richter hardness block. The indication error and repeatability shall not be greater than those specified in Table 5.


Start


• Insert the impact device plug into the impact device socket at the upper end of the instrument.


● Press the button, the power is turned on, and the instrument enters the measurement state.


2. Load


Pushing the loading sleeve downwards locks the impact body; for the DC impact device, the loading rod can be sucked onto the test surface, and the DC impact device is inserted into the loading rod until the stop position, at which point the loading is completed.


3. Positioning


Pressing the impact device support ring against the surface of the sample in the selected measurement direction, the impact direction should be perpendicular to the test surface;


4. Measurement


● Press the release button on the upper part of the impact device to test. At this time, the sample, the impact device, and the operator are required to be stable, and the direction of the force should pass through the axis of the impact device.


● Each test site of the sample is generally tested five times. Data dispersion should not exceed ±15 HL of the average.


● The distance between any two indentations or the distance from the center of any indentation should be in accordance with Table 6.


● For a specific material, to accurately convert the hardness value of the Richter scale to other hardness values, a comparative test must be performed to obtain the corresponding conversion relationship. The method is: the test is carried out on the same sample by using a qualified Leeb hardness tester and a corresponding hardness tester. For each hardness value, five points of hardness were measured uniformly around three or more hardness indentations to be converted, and the hardness average curve and the corresponding hardness average value were respectively used as corresponding values to make a hardness comparison curve. The curve should include at least three sets of corresponding data.


5. Read the measured value.


The average of multiple valid test points is used as a measurement test data.


6. Press the button to shut down.


7. Test results representation method


• The hardness value is shown before the Richter hardness symbol HL, and the impact device type is shown after HL. For example, 700HLD means that the Leeb hardness value measured by the D-type impact device is 700.


● For other hardnesses converted in Leeb hardness, the corresponding hardness symbol should be attached before the Richter hardness symbol. For example, 400 HVHLD indicates that the Vickers hardness value measured by the D-type impact device is 400.


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