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Production sequence of Si-spheres and interferometrical determination of the sphere volume

Interferometric Calibration of Gauge Blocks

Working Group 5.43

Profile

Dissemination of the SI unit of the meter via calibration of gauge blocks, and of prismatic material measures resembling gauge blocks, with very small measurement uncertainties; this task is stipulated by Section 6 of the Units and Time Act [Einheiten- und Zeitgesetz, 2008]. Measurement of thermal expansion.

Assessment of gauge-block calibration laboratories accredited by DAkkS.

Provision of consulting services for calibration laboratories and training measures for calibration employees on handling and calibrating gauge blocks.

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Research/Development

  • Testing the long-term stability of gauge blocks depending on their materials and manufacturing processes.
  • Testing the thermal length change of materials that have a very small CTE (coefficient of linear thermal expansion) at around 20 °C.

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Services

Dissemination of the SI unit of the meter via calibration of gauge blocks as specified in DIN EN ISO 3650, and of prismatic material measures resembling gauge blocks, with very small measurement uncertainties, as a task stipulated by Section 6 of the Units and Time Act [Einheiten- und Zeitgesetz, 2008]. Measurement of the thermal expansion of gauge blocks. Metrological consulting services for special measurements.

Assessments of gauge-block calibration laboratories accredited by DAkkS. System assessments in accordance with ISO 17025.

Provision of consulting services for calibration laboratories and training measures for calibration employees on handling and calibrating gauge blocks. Provision of metrological support to PTB’s Technical Cooperation department for development aid projects.


Gauge BlocksGauge Blocks

Gauge blocks in accordance with DIN EN ISO 3650

 

 

Gauge blocks are the most precise and most widely used embodied standards of length for the dissemination of the unit of length—the meter—to industry and research. This is due to the fact that they have a simple geometric form, provide highly accurate measurements, are reliable and can be calibrated with very small measurement uncertainties. The German standard DIN EN ISO 3650 (1999) specifies the most important dimensional and metrological characteristics of gauge blocks that have a rectangular cross section and a nominal size ln in the range from 0.5 mm to 1000 mm.

 

 

 

 

 

Gauge blocks are the most precise and most widely used embodied standards of length for the dissemination of the unit of length—the meter—to industry and research. This is due to the fact that they have a simple geometric form, provide highly accurate measurements, are reliable and can be calibrated with very small measurement uncertainties. The German standard DIN EN ISO 3650 (1999) specifies the most important dimensional and metrological characteristics of gauge blocks that have a rectangular cross-section and a nominal size ln in the range from 0.5 mm to 1000 mm.

 

 


Traceability


Measuring devices


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Information

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