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A Student Project: Developing LabView Drivers for a Measurement Bridge SVETLANA AVRAMOV-ZAMUROVIC Weapons and Systems Engineering Department, U.S. Naval Academy Annapolis MD, 21412, USA

KAITIAN LIU U.S. Naval Academy Annapolis MD, 21412, USA

BRIAN WALTRIP AND ANDREW KOFFMAN National Institute of Standards and Technology Gaithersburg MD, 20899, USA

Abstract - A measurement bridge to calibrate inductive voltage dividers has been developed at the National Institute of Standards and Technology [1-3]. The bridge is based on the straddling technique and performs self-calibration of decade inductive voltage dividers. It has been driven by a programmable dual-channel source and its output has been monitored with a signal analyzer. A student project was formulated to develop LabView programs in order to fully replace the existing equipment. This paper will describe the implementation of the LabView drivers for the straddling bridge.

I. INTRODUCTION

The original bridge was designed and implemented in 2003. It consists of a comparator and binary inductive voltage divider system [1-3]. The measurement procedure is semiautonomous. LabView is used to control the instrumentation and the user configures the device under the test conditions. Since a fast iterative measurement procedure is required for balancing the bridge, a decision has been made to replace the voltage supply with a new digital data acquisition board with analog-to-digital and digital-to-analog capabilities. The bridge supply signals require accurate amplitude and frequency setting, as well as phase shift adjustment between the in-phase and quadrature signals (signals that are 90 degrees apart). Also, the bridge balance detection signals comparison requires accurate voltage measurements. Two source signals are provided to the system: a sine wave, A, and the sine wave, B, phase shifted by ninety degrees compared to A. These are the supply signals, in phase and quadrature. The signal analyzer is used to measure the difference in phase between the input and output signal across the test component.

II. HARDWARE CONFIGURATION

The Measurement Computing PCI-DAS6052 card is an analog-to-digital (A/D) and digital-to analog (D/A) converter card for use in microcomputers. It was selected for the ability to sample

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Avramov-Zamurovic, S., & Liu, K., & Waltrip, B., & Koffman, A. (2007, June), A Student Project: Developing Labview Drivers For A Measurement Bridge Paper presented at 2007 Annual Conference & Exposition, Honolulu, Hawaii. 10.18260/1-2--1837