In research on the electric vehicles, especially if the internal combustion vehicle is to be modified to the electric vehicle, measurement system should be carefully designed. It should cover all vehicle systems from powering system (batteries, fuel cells…), control system and even up to the vehicle stability system. This paper describes the design process for such measurement system.

Giant Magneto-Resistive (GMR) sensors are solid state sensors suited to detect magnetic fields produced by variable currents. In this work, a GMR sensor is used in a contactless fashion in order to measure current from a load or from a power line distribution cable in order to detect perturbations or disturbances. The aim of this work is to demonstrate the feasibility for using this technology for current measurement in manufacturing field. Results shown that GMR technology is competitive with respect to other technologies and can be useful in health monitoring of industrial equipment

This paper presents a method for calibrating 10:1 ratios in a high-resistance bridge using series resistors simply and accurately. Using the presented method, the combined relative standard uncertainty for 1 GΩ resistance measurements with a modified Wheatstone bridge was estimated to be on the 1 × 10^-6 level. The method was also applied to 1 GΩ resistance measurements using a directcurrent comparator resistance bridge. It was found that the 1 GΩ resistances determined by the two bridges agreed within 2.4 × 10-6 Ω/Ω. We expect that the presented method can also be used to calibrate arbitrary resistance ratios.

A precision DC low-current source based on charging a capacitor with a linearly varying voltage ramp was built to calibrate low-current meters in the range of 100 pA to 1 fA. For a calibration of Keithley 6430, the relative expanded measurement uncertainty (k = 2) was evaluated to be 16 µA/A ~ 62 mA/A within the current range. In the calibration process, it was observed that the offset current of the capacitors lead to a crucial contribution to the measurement uncertainty.

An evaluation technique and traceability for a DC-resistive high-voltage divider was established based on 1 kV, which was traceable to a Josephson voltage standard at the Korea Research Institute of Standards and Science. To do this, the binary step-up method was used to evaluate the voltage-dividing ratio and the voltage coefficient of the divider up to 100 kV. The expanded relative uncertainty for the dividing ratio up to 100 kV was 16 × 10^–6 level. To confirm the validity of the method, the ratio at 1 kV was compared with the resistance ratio of the divider, and the two results agreed to within 5.3 × 10^–6.