TITLE:
An Improved Design of a Fully Automated Multiple Output Micropotentiometer
AUTHORS:
Hala Mohamed Abdel Mageed, Ahmed Faheem Zobaa, Mohamed Helmy Abdel Raouf, Abla Hosni Abd El-Rahman, Mohamed Mamdouh Abdel Aziz
KEYWORDS:
Multiple Output ?pot, AC-DC Transfer Standard, Single Junction Thermal Converter, Calibration, Uncertainty
JOURNAL NAME:
Energy and Power Engineering,
Vol.2 No.2,
May
28,
2010
ABSTRACT: This paper describes in details a new design of a fully automated multiple output micropotentiometer (?pot). A prototype has been built at the National Institute for Standards (NIS), Egypt to establish this highly improved AC voltage source in the millivolt range. The new device offers three different outputs covering a wide frequency range from only one outlet. This valuably supports the precise sourcing ranges of low AC voltage at NIS. The design and the operation theory of this prototype have been discussed in details. An automatic calibration technique has been introduced through specially designed software using the LabVIEW program to enhance the calibration technique and to reduce the uncertainty contributions. Relative small AC-DC differences of our prototype in the three output ranges are fairly verified. The expanded uncertainties of the calibration results for the three output ranges have been faithfully estimated. However, further work is needed to achieve the optimum performance of this new device.