Calibration of setting masters and gauges at The National Laboratory

Purpose

The national laboratories are responsible for maintaining the national reference standards for each measurement quantity and spreading metrological competence and traceability to industry and society at large. The national reference standards are the highest level of traceability in Sweden.

A calibration performed at a national laboratory fulfils all typical traceability and accreditation requirements that commonly exist in industry and society at large. 

Method

The National Laboratory for Length and Dimensional Metrology calibrates several different types of standards for accurate adjustments of measuring machines. Common standards are for example setting rings (internal diameter), reference gauges (external diameter) and pin gauges, as well as tolerance gauges for control of holes, axles or threads. Additionally, we calibrate customized masters for specific purposes.

Most of these objects are calibrated in a single axis measuring machine with two-point measurement. The contact surfaces of the measurement tips are accurately defined with regards to size and form, which is important for the reproducibility.

Deliveries

The calibration results are reported in a digital calibration certificate in Swedish or English which states that the calibration was performed at a national laboratory.