Hardness Tester Calibration
Hardness tester calibration should be performed on a periodic basis to verify that the accuracy of the instrument is within the manufacturer’s stated tolerances for the grade or model. Hardness testing measures the relative resistance of a metal or other material to denting, bending, or scratching. This measurement is only as reliable as the accuracy of your tester.
During hardness tester calibration, LTI Metrology will determine the accuracy of the instrument, make the necessary adjustments to bring it back within the manufacturers’ tolerances and certify it back to the National Institute of Standards and Technology (NIST). LTI Metrology is A2LA accredited and can calibrate all models of micro-hardness, Vickers, Knoop and Rockwell Hardness Testers, and other models onsite at your facility, per the applicable ASTM Standard. Rockwell Hardness Tester calibration to C, B, A and E Scales and Superficial Rockwell Hardness Tester calibration including 15, 30, 45 N&T Scales are performed.
Our field calibration specialists also provide preventative maintenance and repair services. LTI Metrology can supply indenters, blocks and new hardness testers.
The Calibration Process
Prior to Rockwell hardness tester calibration, the machine is leveled and inspected for chips, breaks or cracks. The calibration process involves verifying the condition of the anvil and indenter, then running five hardness tests on three certified hardness test blocks, representing the high, middle and low ranges on all scales being verified. If the instrument reads within the tolerances of the test blocks, the machine is deemed certifiable. This method of verification takes into account and combines all of the variables that produce the actual hardness number, just as would be done during actual testing.
Hardness Tester Calibration Capabilities
Calibration for most models including:
- Rockwell scales C, B, A and E
- Superficial Rockwell to 15, 30, 45 N&T Scales
- Vickers & Knoop
- Micro-hardness testers
- Leeb testers
- Durometer testers
- Analog manual and digital load cell types
- Portable testers