Achievement of AC Voltage Traceability and Uncertainty of NIS, Egypt through Capabilities of NIST, USA

Abstract

This paper describes the methodology used to achieve the AC voltage traceability and the associated uncertainty in National Institute for Standards (NIS), Egypt via the capabilities of National Institute for Standards and Technology (NIST), USA.  The methodology includes the use of the thermal voltage converters (TVCs) and micropotentiometers (µPots) via a new automated calibration system for determination of the AC-DC Differences at different frequencies.  To confirm the results of this process, a bilateral comparison with NIST was organized through a set of (TVCs) to cover the range from 1 V to 200 V at frequencies of 55 Hz, 1 kHz, 10 kHz and 200 kHz.  The comparison results associated with the uncertainty analysis are also discussed in this paper.  For low values of AC voltage, new three µPots were fabricated at NIST to establish the traceability from 50 mV to 200 mV at frequencies from 20 Hz to 1 MHz. The converters used in this work are also modeled then simulated using LT-spice/SwCAD III simulator.

Keywords: electrical measurements, thermal voltage converter, micropotentiometer, modelling and electrical simulation, uncertainty analysis, bilateral comparison.