Abstract
Automation in measurement has wide range of electrical metrology applications and construction of powerful calibration software is one of the highly accurate metrological laboratories’ priorities. Thus, two automatic systems for controlling and calibrating the electrical reference standards have been established at National Institute for Standards (NIS), Egypt. The first system has been built to calibrate the zener diode reference standards while the second one has been built to calibrate the electrical sourcing and measuring instruments. These two systems act as the comprehensive and reliable structure that, from the national electrical standards, disseminates the traceability to all the electrical units under calibration. The software of the two systems has been built using the Laboratory Virtual Instrument Engineering Workbench (LabVIEW) graphical language. The standard development procedures have been followed in the building of both systems software. The software requirement specifications as well as functional specifications are taken into consideration. Design, implementation and testing of the software have been performed. Furthermore, software validation for measurements’ uncertainty as well as results’ compatibility in both automatic and manual modes has been achieved.
Highlights
Programmable instruments are widely employed and increasingly included in metrological laboratories, they can automatically perform high quality and time consuming operations required in calibration activity
This paper introduces two new automatic calibration systems that rely on Labview, Where both software and hardware of the systems are fully presented
Diagram of the implemented system, it consists of a programmable calibrator as a reference standard source for voltages, currents and resistances, a digital multimeters (DMMs) as a reference standard measuring instrument, and a PC controlled by General Purpose Interface Bus (GPIB)
Summary
Programmable instruments are widely employed and increasingly included in metrological laboratories, they can automatically perform high quality and time consuming operations required in calibration activity. In the fields of electrical and electronic standards, the parameters are voltage, current and resistance [3] It has been essential for NIS as the primary laboratory for DC electrical metrology in Egypt to construct a special programmable measurement system for the calibration of both NIS and customers’ DC voltage reference standards. This system has been built as the inclusive and consistent construction that, from the national standards, disseminates the traceability to all the DC voltage reference standards under calibration. A comparison between the manual and automatic calibration results of the sourcing and measuring instruments is introduced
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