preview

Essay On Calibration

Satisfactory Essays

This paper focuses on achieving traceability of high-voltage measurements up to 200 kV at the Egyptian National Institute of Standards. The measuring system consists of an AC/DC voltmeter and a universal resistive/capacitive high-voltage divider. The voltmeter shows the measured voltage values while considering an actual scale factor of the voltage divider. The used divider ensures stable capacitance for AC voltage measurements and an additional resistive parallel path for DC voltage measurements. Both the divider and the voltmeter are calibrated in AC and DC modes. All uncertainty components are taken into account to obtain the near-actual values of the measuring system with an acceptable accuracy. The calibration results in traceability …show more content…

The most used method to calibrate the division ratio is to get the ratio between actual voltages on the high-voltage and low-voltage arms of the divider [5-7]. In other words, the true voltage values of a high-voltage source are obtained from multiplication of the actual voltages on the low-voltage arm times the actual ratio of the division.
The precision of high-voltage DC dividers mainly relies on the resistive design, while high-voltage AC dividers are commonly based on the capacitive design [8]. In this regards, Josephson Voltage Standard (JVS) has been used for many years as a DC voltage standard with ultimate accuracy [9-11].
Traceability of DC and AC voltage measurements up to 100 kV was previously realized at National Institute of Standards (NIS) via a DC-JVS [4, 9]. In the studies presented by El-Rifaie et al. in [4] and Abdel Mageed et al. in [9], the uncertainty of the DC and AC high-voltage measurements up to 100 kV has been significantly enhanced after achieving traceability from the JVS.
In this work, traceability dissemination of DC and AC voltages up to 200 kV on the basis of the traceable 100 kV measurements is obtained using enhanced calibration method. The high-voltage system considered in this study consists of two main parts, namely the divider and display, in which both of them are calibrated. A two-stage Haefely Trench high-voltage AC source (PZT-100) is used to

Get Access