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Research is underway to develop improved resistance standards based on the the quantum Hall effect at ac, to improve the calibration chain relating resistance to capacitance, and to provide 1 ohm standard resistors of exceptional electrical stability.
http://measurement.authprod.ind/ScienceTechnology/Pages/ImpedanceandResistance.aspx
Our capabilities in measuring impedance and resistance are based on the calculable capacitor and NMI's facility for the quantised-Hall resistance.
http://measurement.authprod.ind/Services/calibrationtesting/Pages/ImpedanceandResistanceFacilities.aspx
Calibration and testing services for capacitors, inductors, ratio transformers and resistors.
http://measurement.authprod.ind/Services/calibrationtesting/Pages/ImpedanceandResistance.aspx