EECS 100 Multimeter and Supplies L. Chua Page 1 of 5 LAB REPORT 1 V2 Lab Session: Name 1: SID: Name 2: SID: P=Predicted. Summarize your answers on the LAST SHEET and hand in at the BEGINNING of the lab. This is your PRELAB Report. M=Measured. Hand in report at the end of the lab. This is your LAB Report. 1. Laboratory Power Supply Set the laboratory supply for 5V output and 20mA maximum current and load it with resistor R1=1kΩ (Figure 0). Use the 0 … 25V output. a) Verify the output voltage with the voltmeter. (Use the multimeter for all these measurements. The meter that is built into the supply is not as accurate). Predicted value: _____ V ___ of 1 P Measured Value: _____ V ___ of 1 M b) Disconnect the voltmeter. What is the current flowing through resistor R1? Predicted value: _____ A ___ of 1 P Design a circuit for measuring the current flowing through R1. Your diagram should include the supply, resistor, and the ampere meter. Figure 0 Power supply with resistive load and voltmeter.EECS 100 Multimeter and Supplies L. Chua Page 2 of 5 ___ of 3 P Measured Value: _____ A ___ of 1 M Explain discrepancies: ___ of 2 M c) Replace R1 with a 100Ω resistor. What are the voltage across and current flowing through the resistor? Predicted values: _____ V _____ A ___ of 2 P Measured values: _____ V _____ A ___ of 1 M Explain discrepancies: ___ of 2 M d) Calculate the smallest value of R1 for which the supply output remains at 5V. Calculated value of R1 _____ Ω ___ of 2 P Measured voltage and current (note that the resistor gets warm or hot if you increase the voltage) _____ V _____ A ___ of 2 M Explain discrepancies: ___ of 2 MEECS 100 Multimeter and Supplies L. Chua Page 3 of 5 e) Measure the IV characteristic of the supply with the settings from part (a), using different values of R1 to get sufficient data points. Also transfer the measured data points from parts (b), (c), and (d) to the graph. Please draw neatly and use a ruler! ___ of 3 P ___ of 3 M _____ mEECS 100 Multimeter and Supplies L. Chua Page 4 of 5 SUGGESTIONS AND FEEDBACK Time for completing prelab: Time for completing lab: Please explain difficulties you had and suggestions for improving this laboratory. Be specific, e.g. refer to paragraphs or figures in the write-up. Explain what experiments should be added, modified (how?), or dropped.EECS 100 Multimeter and Supplies L. Chua Page 5 of 5 PRELAB SUMMARY Summarize your prelab (P) results here and turn this in at the BEGINNING of the lab session. Problem Result Points 1a V ___ of 1 P 1b A ___ of 1 P 1b ___ of 3 P 1c V A ___ of 2 P 1d Ω ___ of 2 P 1e ___ of 3
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