Pyser-SGI offers calibration and re-calibration of its scales, grids and other calibration artefacts from the most appropriate laboratory to suit the customer requirements - the choice of laboratory is normally dependent on the nature of the calibration and the accuracy required.
Calibration by NPL. The National Physical Laboratory carries out measurements at selected points on the scales and grids and issues a certificate of calibration that is traceable to international standards. In general certificates offered by NPL have a better uncertainty than those offered by UKAS, and NPL is the UK's National Metrology Laboratory.
Calibration by UKAS accredited laboratory. A UKAS accredited laboratory carries out measurements at selected points on the scales and grids and issues a certificate of calibration that is traceable to international standards. This means that UKAS and NPL calibrations offered by Pyser-SGI will satisfy the requirements of NIST, DIN, DKD, Accredia, Cofrac, NABL, APLAC and all other National Metrology Institutes across the world.
Both of the above calibrations will provide the necessary certifications for compliance with ISO17025. Customers often demand different calibrations than those traditionally offered. Some need more points measured, some need an x-y coordinate map on calibration plates and some may need a better uncertainty. Pyser-SGI offers traceable solutions to all of these requirements.
The ASTM B487 standard demands a calibration uncertainty of 0.2um for stage micrometers, we are pleased to offer calibration certificates from NPL that will satisfy this requirement.
Measurement by Graticules. For applications that do not require the accuracy and traceability of UKAS and NPL calibrations, Graticules can provide a certificate of calibration. The scale or grid is compared with NPL calibrated in-house standards and a statement is provided on the accuracy of the item with respect to these standards.
Re-calibrations of customers' own scales and grids also available. It is recommended and common practice to have these products calibrated at least every 3 years, but this period will have to be part of the users calibration routine and will need agreement with the quality auditor. If no recalibration time period is stated at the time of an order, then this will default to 2 years.