Calibration Procedures and Type of Instruments/Materials to be calibrated |
Range |
Expanded Uncertainty*
(Level of Confidence
Approximately 95%)
(L (mm):Nominal length) |
Permanent Laboratory |
On-site Calibration |
Rockwell Hadness
Testing Machines, etc |
Rockwell Hardness
Reference Blocks |
From 20 HRC
up to 25 HRC |
0.43 HRC |
- |
More than 25 HRC
less than 35 HRC |
0.44 HRC |
- |
From 35 HRC
up to 45 HRC |
0.42 HRC |
- |
More than 45 HRC
less than 55 HRC |
0.39 HRC |
- |
From 55 HRC
up to 65 HRC |
0.35 HRC |
- |
Vickers Hardness
Testing Machines, etc. |
Vickers Hardness
Reference Blocks |
From 85 HV p to 1050 HV
(Test force From 0.9807 N up to 490.3 N ) |
d > 193 μm
2.2 %
d ≦ 193 μm
(228 / d) + 1.02 %
Where: d is the length of a
diagonal line of the
indentation (μm) |
- |