High voltage and current High voltage and current SP Swedish National Testing and Research Institute SP can calibrate measuring and generating instruments as well as transducers such as transformers, voltage dividers and shunts. All our calibrations are traceable to our own or to international references. Our best uncertainties are given below. Additional uncertainties associated with the calibrated objects are to be considered.
Uncertainty is determined of reading accuracy of the voltmeter.
Our resources for direct voltage enable us to reach 500 kV both for generation and for measurement. Uncertainty is determined of reading accuracy of the voltmeter.