BME 153 lab 3 _Nigel

# BME 153 lab 3 _Nigel - BME 153 Lab 3 Lab 3 Wheatstone...

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BME 153 Lab 3 Lab 3 – Wheatstone bridge and temperature measurement Nigel Chou Shijie Lab Partner: Tim Liu Section 1 September 12, 2007 I have adhered to the Duke Community Standard in completing this assignment. _____________________________ Objectives The objective of this lab is to learn to use the oscilloscope and the function generator. We also learned to measure capacitance and inductance using a LCR meter. Apparatus LCR Meter Fluke 45 Dual Display Bench Multimeter / Digital Multimeter (DMM) BK Precision 1652 Triple Output Power supply Tektronic TDS 1012 Digital Storage Oscilloscope TGS 50 Signal generator Procedure The procedure listed in the lab manual was followed with no deviation. Data and Calculations Equations used in post lab questions are in the post-lab section. Results Peak-to-Peak Voltage: 6.00 V Frequency: 1.002 kHz V in : ) 2004 sin( 00 . 3 t π V a : ) 2004 sin( 81 . 1 t V b : ) 2004 sin( 66 . 1 t Table 1 : Current and Voltage across different resistors R 1 to R 5 of Figure 1. Resistor Resistance ( ) Voltage (V) V rms (V) Current (mA) I rms (mA) Power dissipated (mW) R1 1000 1.19 sin(2004πt) 0.841 1.19 sin(2004πt) 0.841 0.708 R2 2000 1.81 sin(2004πt) 1.28 0.905 sin(2004πt) 0.640 0.819 R3 470 0.15 sin(2004πt) 0.106 0.319 sin(2004πt) 0.226 0.0239 R4 1500 1.66 sin(2004πt) 1.17 1.11 sin(2004πt) 0.782 0.919 R5 1800 1.34 sin(2004πt) 0.947 0.744 sin(2004πt) 0.526 0.499 Total: 2.97 Resistance of R 2 when balanced: 143.2 1.19 1.81 0.15 1

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BME 153 Lab 3 1.66 1.34 2
BME 153 Lab 3 Table 2 : Measurement of V out when thermistor is in water baths of various temperatures Temperature of water bath measured using bulb thermometer (°C) (given to ± 0.5°C) V out (V) 0.0 20.13 × 10 -3 23.0 2.3731 47.0 4.196 60.5 4.730 mystery 2.3092 Figure 1 : Plot of V out vs. R t for Wheatstone bridge circuit. Analytical relationship is included for comparison. Figure 2 : Plot of V out vs Temperature for Wheatstone bridge circuit with thermistor as R t . Analysis Oscilloscope The Y-axis of the graph shows the voltage and the x-axis of the graph shows time. The numerical measurements possible using the MEASURE menu include the mean voltage, the period, the mean, the Peak-to-Peak (Pk-Pk) voltage, the Cyclic RMS, minimum and maximum voltage, Triggering refers to prompting the oscilloscope to start tracing the input voltage on the

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## This lab report was uploaded on 04/09/2008 for the course BME 153 taught by Professor Malkin during the Fall '07 term at Duke.

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BME 153 lab 3 _Nigel - BME 153 Lab 3 Lab 3 Wheatstone...

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