BME 154 lab 1 _Nigel

BME 154 lab 1 _Nigel - BME 154 Lab 1 Equipment review Lab 1...

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BME 154 Lab 1 – Equipment review Lab 1 – Equipment review Nigel Chou Shijie Lab Partner: Jay Gupta January 14, 2008 I have adhered to the Duke Community Standard in completing this assignment. Abstract The objective of this lab was to review the operation of the Signal generator, Oscilloscope and Digital Multimeter by directly or indirectly measuring frequency, period, amplitude, peak-to-peak voltage and Root Mean Square voltage of a waveform, and learn to use the LabVIEW Frequency Counter to measure the frequency of a waveform. The DMM was found to give better quantitative measurements with lower uncertainties, but that the Oscilloscope was indispensable for finding the characteristics of waves more complex than a simple sine wave. The Frequency counter appeared to give a better resolution at higher gate times, and this was supported by theoretical arguments. We also explored the trigger and acquisition functions of the Oscilloscope in deeper detail, showing how the trigger level and direction shifted the signal right or left. We also concluded that the single acquisition mode was useful for measuring transient voltage changes because it stores of a single trace for later viewing. After various tests, the mechanism behind the AC-coupling mode was deduced: it utilizes a high-pass filter to attenuate the DC component of the signal. Procedure The procedure listed in the lab manual was followed with a slight deviation: the Tek-tok application was not working during the lab period and hence all traces are sketched instead of screen-captured. For the frequency counter measurements in the given table, a gate time of 0.01 was used. The measurement displayed fluctuated over time, so an average value was taken. . Results Calculations For measurements with the DMM and frequency counter, the period was calculated by frequency 1 Period = , and the peak-to-peak voltage was calculated according to ( 29 RMS Pk - Pk V 2 2 V = . The uncertainties for the DMM and the Oscilloscope were obtained from the Uncertainties of BME153/BME154 Laboratory Equipment document and Tektronix TDS1000- and TDS2000-Series Digital Storage Oscilloscope User Manual , and the Oscilloscope uncertainty was calculated using the accuracy specification for vertical position at zero which differs from the specification listed in the Uncertainties document. The uncertainty was calculated using 500mV/div. 1
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BME 154 Lab 1 – Equipment review Tables and charts 3.1 Survey of Instruments Table 1 : Measurements made using frequency counter, Oscilloscope and DMM for 1kHz sine wave Frequency Counter Oscilloscope DMM Value, Units D/C Value, Units D/C Value, Units D/C Frequency 1000 Hz D 1000 Hz D 1000.4 ± 0.7 Hz D Period 1 ms C 1.000 ± 0.002 ms D 999.60 μs C AC Voltage (RMS) × 378 ± 164 mV D 367.1 ± 2.0 mV D AC Voltage (Pk-Pk)* × 1.12 ± 0.39 V D 1038 mV C DC Voltage × 38.0 ± 62.4 mV D -4.32 ± 0.07 mV D * Pk-Pk voltage used on Signal Generator for all three types of wave was 1.00V Table 2 :
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BME 154 lab 1 _Nigel - BME 154 Lab 1 Equipment review Lab 1...

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