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.
Highlights
In recent years new types of AC instruments and high precision AC-DC voltage transfer devices for low voltages and high frequencies have been widely adopted in metrological and industrial laboratories
This paper describes in details a new design of a fully automated multiple output micropotentiometer
multi-junction thermal converter (MJTC) in planar technique are used for voltages down to 100 mV [9], single-junction thermal converter (SJTC) are mainly used as thermal current converters because they are simpler and available [8]
Summary
In recent years new types of AC instruments and high precision AC-DC voltage transfer devices for low voltages and high frequencies have been widely adopted in metrological and industrial laboratories. The measurement of AC quantities with thermal converters implies the transformation of the electrical energy into thermal energy by means of the Joule heat dissipated in the thermal converter heater resistor [5,6] These thermal converters are the most accurate AC-DC transfer standards for the transfer of alternating voltage and current to the equivalent DC quantities [7,8]. In this work we aimed to build a fully automated prototype of a multiple range μpot offering three different output millivolt ranges from only one outlet through two disc resistors These three output ranges are 300 mV, 400 mV, and the parallel resistances combination equivalent value (171.4 mV) at frequencies from 10 Hz to 10 KHz. the automatic calibrations of the new device, the AC-DC differences ( ), and the expanded uncertainties for the results had been fully investigated in this work
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