Calibration of electric voltage

Purpose

RISE's calibration at the National Laboratory for electrical quantities is available to customers who require the best possible accuracy in their calibration or have requirements which involves development of new calibration methods. Our customers are found among industry, research institutes, and calibration companies. The national reference standards at the National Laboratory have the highest level of accuracy in Sweden. The traceability to the realisation of the unit is always ensured.

Calibration at a National Laboratory meets all the typical requirements for traceability and accreditation commonly found in industry and society at large.

Method

The calibration resources for direct voltage are in the range of 1 nV – 1MV. In addition to voltage standards we also calibrate different kind of instruments, for example voltage dividers, voltmeters and calibrators. For high voltage, above 1000 V, the most common objects are voltage dividers and probes.

Almost all calibration of voltage standards for voltages up to 10 V are fully automatized and are carried out through comparison with groups of primary and secondary voltage standards. The measurement interval can be varied from a few seconds when short term stability is measured, to several weeks for long term stability. The measurement uncertainty is at best 0.3 μV/V.

For calibrations up to 10 V of voltage standards and certain types of voltage dividers we offer calibration with the best possible measurement uncertainty by calibration directly against a Josephson standard. The measurement uncertainty will then be 3 nV/V at best.

Other types of measurements can also be performed, for example extraction of temperature coefficient.

The measurement uncertainty given for a calibration depends, in addition to the calibration equipment’s performance, also on the calibration object’s performance (stability, temperature coefficient, voltage dependence and so on). In most cases, a preliminary estimate of the measurement uncertainty can be given from experience before the calibration.

For more information about our Josephson reference standards and realisation of the voltage unit, see our expertise page on electrical voltage.

Deliveries

Delivery upon agreement with customer. The results of the calibration are reported in a calibration certificate.

When becoming a client you will also get access to our customer website for calibration, where you may also place orders. 

Customer website for calibration