It is recommended in IEC 60060-2:2010 that measuring systems employed in high-voltage impulse tests of electric apparatuses are calibrated directly or indirectly through comparison with a national standard. Japan High-voltage Impulse testing Laboratory Liaison has attempted to establish a calibration scheme of impulse-high-voltage measuring system traceable to national standards in cooperation with Japan Electric Meters Inspection Corporation. In this paper, the calibration of the working-standard measuring systems employed in the established calibration scheme are introduced. Nextly, uncertainties of the calibration by the established scheme are explained. Finally, the traceability system of the established calibration scheme is presented.
In this paper, it is reported to get the information on a temperature and wind velocity as physical quantities by multi-functional measurement using a thermistor. The thermistor provides the information such as humidity and wind velocity in the case of the changes of the electric current supplied to the thermistor. These multi-functional measurements are performed with the measurement system produced under the obtained database, and the characteristics relation between the supplied currents in the thermistor is investigated by the database.The measuring system shown in Fig.1 to generate wind in a bath with controlled a temperature and humidity is used. The wind is controlled to ±0.1 m/s. In this system, a standard temperature sensor and a standard wind velocity sensor are used for standards of temperature and wind velocity. The standard wind velocity sensor is the vane type to be able to ignore the temperature effect, which is set near the output of the pipe. Because the temperature measured with self-heating of the thermistor is different from the actual temperature, the correct temperature from a standard temperature sensor was used to investigate the relationship between the position of the standard temperature sensor and the position of the thermistor. The resistance of the thermistor is obtained as the voltage drop in the resistance of thermistor by supplying electric current from the constant current source.The measurement of the temperature in the ranges from 25 °C to 35 °C and wind velocity in the ranges from 1 m/s to 4 m/s based on multi-functional measurement using the thermistor with supplied currents of 2.5 mA and 5 mA were tried. The database (Fig.2) using investigated characteristic data is provided, and using the database, signal processing is executed. From the measurement result, the possibility of realization of this multi-functional measurement of the temperature (The resolution is about 0.2 °C.) and wind velocity (The resolution is about 0.4 m/s.) by the thermistor can be shown.
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