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Vol. 153, No. 6, June 2013, pp. 155-160

 

Bullet

 

The Effect of Changing the Applied Sequence Using the TVC on the Accuracy of the AC Signal Calibration
 
Rasha S. M. Ali

National Institute for Standards (NIS), Tersa Street-Elharam, Giza, 12211, Egypt

Tel.: 0201003342242, fax: 0020233867451

E-mail: rasha_sama79@hotmail.com

 

Received: 31 January 2013   /Accepted: 14 June 2013   /Published: 25 June 2013

Digital Sensors and Sensor Sysstems

 

Abstract: Ac signals are accurately measured by using Thermal Converters (TCs). In this paper, ac voltages are automatically calibrated as an example by the Thermal Voltage Converter (TVC) with changing the sequence of the applied signals. 1 V, 10 V, and 100 V at different frequencies from 50 Hz to 100 kHz are measured. The three different sequences are sequence #1 which is (+dc, ac, -dc), sequence #2 which is (ac, +dc, -dc, ac), and sequence #3 which is (ac, +dc, ac, -dc, ac). The effect of changing the applied sequence is studied to have the more precise and accurate performance. In order to achieve switching between ac and dc at regular and precise intervals and the comparison is made sequentially, a LabVIEW program is especially built for this study. The uncertainty budgets for the different ac voltages are also evaluated.

 

Keywords: ac metrology, Thermal-element, Thermal voltage converter, Range resistors, Temperature coefficient, Uncertainty

 

 

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