Effective the 31st of March 2021, UMVS can now issue NATA endorsed reports for Wh and Varh calibrations.
We are very happy to have been able to achieve a very respectable level of least uncertainty thanks to some innovation in our testing and reporting process.
Our scope of accreditation is for Calibration and Measurement Capability of –
Watt-hour meters at 50 Hz across power factors 1.0 to 0.5 leading and lagging currents
0.03% / cos Φ for currents from less than 20 mA and voltages from 63.5 V AC to 240 V AC
0.02% / cos Φ for currents from 20 mA to 100 A and voltages from 63.5 V AC to 240V AC
Var-hour meters at 50 Hz across power factors 1.0 to 0.5 leading and lagging
0.04% / sin Φ for currents from 50 mA to 100 A and voltages from 63.5 V AC to 240V AC