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In this paper, a new method is introduced for AC voltage ranges that are higher than 1 V by using the thermal converters. It can be used in laboratories in case of unavailability of the whole ranges of multiplier range resistors set. The introduced method depends on dividing the AC voltage of the unit under test to 1 V by using AC voltage divider. The divided AC voltage is then measured using 1 V...
The main ratios of the Measurements International corporation (MI) 6010C automatic resistance bridge have been verified in this paper. The used method for verification is the exchanging method where the two resistors are interchanged, and then the offset error is computed. Then, this method has been evaluated by two other comparison methods for the 1:1 and 1:10 ratios. The expanded uncertainties at...
Some improvements are presented in this paper to the previously introduced automated multi-range multipliers system. These multipliers; range resistors are selected automatically by using electronic relays controlled by a micro-controller that connects the suitable multiplier to the thermal voltage converter to calibrate the required ac voltage. The modifications done on the old system are mainly...
Some of traceability chains for the AC resistance measurements are based on AC/DC resistors. In this paper, performance of two types of them with different values has been investigated for their optimum utilization. Tinsley and Cambridge AC/DC resistors have been measured as DC resistors using different measurement methods and as AC resistors at various frequencies. DC direct method using digital...
The paper describes an interlaboratory comparison program between the National Institute for Standards (NIS), Egypt and the Istituto Nazionale di Ricerca Metrological (I.N.Ri.M.), Italy for measuring low ac voltages. The aim of this program is to demonstrate the technical competence of both institutes. The interlaboratory comparison has been carried out under the framework of the executive program...
The calibration of resistances was being performed manually at National Institute of Standards (NIS), Egypt till now. In this paper, a fully automated system for the remote calibrations of resistances is described. This sytem is mainly used for routine calibrations for low precision calibrations. The calibration of many resistors can be performed in this system automatically through the Resistors...
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