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ENGR201_VoltageMeas_930

ENGR201_VoltageMeas_930 - Voltage Measurement ENGR 201...

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Voltage Measurement ENGR 201 Evaluation and Presentation of Experimental Data I Section 073 07 May 2010
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ABSTRACT With the incorporation of National Instruments’ LabVIEW 2009 graphical programming software, the NI USB-6009 Data Acquisition instrument, and the HP E3631A DC power supply, we were posed with the issue of an effective way to measure the voltage produced by the HP E3631A as a function of time. The resulting data was then compiled and analyzed using scatter plots and finite statistics in an effort to determine whether or not the HP E3631A and NI USB- 6009 DAQ were working up to the manufacturers’ specification claims. Ideally, the mean DC power supply output voltage should match the mean input voltage sensed and measured by the NI USB-6009 DAQ, directly correlating to instrument accuracies. High accuracy and precision was demonstrated for the 1 volt input measured by the Data Acquisition device. The mean, median, and mode for this input condition were calculated as 1.00 volt, with a minimal standard deviation of only 4.09E-03 volts. If the number of voltage measurements were increased, the standard deviation would be expected to decrease even further and shift the sample mean closer to the true mean value.
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TABLE OF CONTENTS CONTENT PAGE(S) Introduction …………………………….….….………………….….…...……….… 1-2 Theory …………………………………………..…………………………… ....... …. 3-4 Experimental Program ……………………………..………….….….……….…..…. 5-8 Results ……………………………………………… .... ….……………………...…. 9-12 Uncertainty Analysis ………………………………….….….…………………… ..... 13 Discussion ………………………………………………….………...……….…..…. 14 Conclusions and Recommendations ………………...…..….………….……..……... 15 References ……………………………………………………………….…….…….. 16 Appendix ………………………………………….…….…….………… ...... …… ..... 17-27
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Page | 1 INTRODUCTION Many data acquisition products have multiple functions and capabilities of quantitatively measuring various stimuli. For our purposes and data collection, National Instruments’ USB- 6009 DAQ was applied to measure voltage, provided by the HP E3631A DC power supply, over a given time. National Instruments’ 2009 LabVIEW software, a graphical programming interface used primarily by scientists and engineers for controlling and measuring systems, acquiring data, processing signals, controlling instruments, and aiding in automation, was used in conjunction with the NI USB-6009 DAQ [1]. The developed LabVIEW Virtual Interface (VI) served as both a transducer and an output. The VI converted the sensed information from the NI USB-6009 DAQ into a detectable signal, which could be further quantified. In addition, the LabVIEW VI displayed a readout during the output stage and recorded the value measured [2]. The preceding
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