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This part of ISO 6508 specifies two separate methods – direct and indirect – of verification of testing machines for determining Rockwell hardness
(scales A, B, C, D, E, F, G, H, K, N, T) in accordance with ISO 6508-1, together with a method for verifying Rockwell hardness indenters.
The direct verification method is used to determine whether the main parameters associated with the machine function – such as applied force, depth measurement, and testing cycle timing - fall within specified tolerances. The indirect verification method uses a number of calibrated reference hardness blocks to determine how well the machine can measure a material of known hardness
The indirect method may be used on its own for periodic routine checking of the machine in service.
If a testing machine is also to be used for other methods of hardness testing, it shall be verified independently for each method.
This part of ISO 6508 is applicable to stationary and portable hardness testing machines.
Attention is drawn to the fact that the use of hardmetal for ball indenters is considered to be the standard type of Rockwell indenter ball. Steel indenter balls may continue to be used only when complying with 6508
-1 :20xx, Annex A.
This part of ISO 16859 specified a method for the calibration of reference test blocks that are used for the indirect verification of Leeb hardness testers according to ISO/DIS 16859‑2:2012 and for the periodic checking according to ISO/DIS 16859-1:2012.
The procedures necessary to ensure metrological traceability of the calibration machine are also specified.
This part of ISO 16859 specifies methods for direct and indirect verification of test instruments used for determining Leeb hardness in accordance with ISO 16859‑1, and also describes when these two types of verification shall be performed.
The direct verification involves checking that individual instrument performance parameters fall within specified limits, whereas the indirect verification utilizes hardness measurements of reference test blocks, calibrated in accordance with ISO 16859-3, to check the overall performance of the instrument. The indirect method may be used on its own for the periodic performance checking in service.
NOTE°1 Direct verification of test instruments included in this standard can only be done where applicable reference values are provided by the instrument manufacturer.
NOTE°2 For testing in directions other than in direction of gravity, the measured hardness number will be biased. For such cases, the correction values shall be provided by the manufacturer.
This standard covers the determination of the Leeb hardness of metallic materials using six different Leeb scales (HLD, HLS, HLE, HLDL, HLD+15, HLC, HLG).
This part of ISO 7500 specifies the verification of tension/compression testing machines.
The verification consists of
— a general inspection of the testing machine, including its accessories for the force application;
— a calibration of the force-measuring system.
NOTE This part of ISO 7500 addresses the static verification of the force-measuring systems. The calibration values are not necessarily valid for high-speed or dynamic testing applications. Further information regarding dynamic effects is given in the Bibliography.