experiment 1 - Laboratory#1 Introduction to CDAS and...

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Laboratory #1: Introduction to CDAS and Measurement Techniques Oct 5, 2010 Ruonan Liu Adit Joshi Bajee Bobba Sudeep Nigam Abstract: This lab serves as an introduction to Electrical Machines Laboratory and the Computerized Data Acquisition System (CDAS) as well as to become familiar with the instrumentation and techniques used for measuring AC and DC voltage, current, and power. The results of the experiment verify expectations concerning elementary relationships between voltage, current, resistance, power, and power factor.
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Introduction: The purpose of this lab is to provide an introduction to Electrical Machines Laboratory and the Computerized Data Acquisition System (CDAS) as well as to become familiar with the instrumentation and techniques used for measuring AC and DC voltage, current, and power. The first part involved connecting a 3AC circuit and a DC circuit (depicted in the lab manual) with a resistance and reviewing the computerized data acquisition. Next, we energized the 3AC circuit with 240V 3 60Hz. While decreasing the load resistance from infinity to a value where the current ranges from 0 to 50 amps, the following were to be recorded and graphed: a) V vs. I b) P vs. I c) Power factor vs. I d) R vs. I The final exercise requires energizing the DC circuit used in the previous measurements instead with 125 V DC. We were to decrease the resistance load from an open circuit to a value that in which the current varies from 0 to 50 amps. While decreasing the load we were to record and graph the following: a) V vs. I b) P vs. I c) R vs. I Equipment: - Computerized Data Acquisition System : Composed of experiment table with voltage and current transducers, Analog to digital converter, data acquisition and processing software, and IBM compatible personal computer - Power Supplies: 240 V 60 Hz, 125 V DC - Resistive Load Box - Patch Cables Questions: A. The results of the AC test are as expected. The first graph ( Figure 1 ), V vs. I, remains constant at approximately 142V. The generated graph suggests that the line is going straight horizontally towards current at a certain voltage. The connection topography is not specified in lab manual, so we assume it is Y connection.
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