Calibration Procedures and Type of Instruments/Materials to be calibrated |
Range |
Expanded Uncertainty*1 (Level of Confidence Approximately 95%) |
Rockwell Hadness
Testing Machines, etc |
Rockwell Hardness
Testing Machines |
From 20 HRC
up to 25 HRC |
0.45 HRC |
More than 25 HRC
less than 35 HRC |
0.46 HRC |
From 35 HRC
up to 45 HRC |
0.44 HRC |
More than 45 HRC
less than 55 HRC |
0.41 HRC |
From 55 HRC
up to 65 HRC |
0.37 HRC |
Vickers Hardness
Testing Machines, etc. |
Vickers Hardness
Testing Machines |
From 85 HV up to 1050 HV (Test force from 0.9807 N up to 490.4 N )
|
a) d > 170 μm
2.4 %
d ≦ 170 μm
(230 / d + 1.1) %
Where: d is the length of a
diagonal line of the
indentation (μm)
|