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Status : Active
Standard Type : Main
Document No : ISO 16859-2:2015
Document Year : 2015
Pages : 12
Edition : 1
Section Volume : Hardness testing (ISO/TC 164/SC 3.)
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 for testing in the direction of gravity. The indirect method can be used on its own for the periodic performance checking in service.