BME/ISE 3511 Laboratory One - Laboratory Equipment for Measurement. Introduction to biomedical electronic laboratory instrumentation and measurements.

Transcription

1 BME/ISE 3511 Laboratory One - Laboratory Equipment for Measurement Learning Objectives: Introduction to biomedical electronic laboratory instrumentation and measurements. Supplies and Components: Breadboard 1 kω Resistor 0.1 µf Capacitor Post-Lab Questions 1. Describe the continuity of the breadboard. 2. In Experiment 1, what causes the resistive value when measuring for continuity? 3. Describe the purpose of the Function Generator and the Oscilloscope. What are they used for? 4. Using the measured voltage and load resistance values, calculate the internal resistance. What contributes to an increase in the internal resistance? 5. In Experiment 3, what kind of filter was used and explain your reasoning.

2 Laboratory One - Laboratory Equipment for Measurement Laboratory Procedures 1) Experiment 1 For this experiment, you willl test the continuity of the breadboard. First, open the NI mydaq instrument launcher and from there click onn the continuity symbol as shown below: The next step is to insert two jumper cables in the breadboard at the positionss outlined in Table 1:

3 Place the two ends of the probes on the exposed end of the jumper cables and determine whether the two ports are connected or not. If they are not continuous then the mydaq will read OPEN: If the two ports are continuous then the mydaq will emit a sound and it will display a small resistive value: Fill out the Table 1 on the next page by repeating this procedure for the appropriate connections.

4 Table 1: Continuity Test.

5 2) Experiment 2 For this part of the experiment you will use a function generator and the Oscilloscope. In order to wire the two pieces of equipment, connect A0-0 to A1-0+ and also connect A0-GND to A1-0-. The connections are shown below: The image below shows the Functionn Generator which allows you to adjust the waveform (1.), the frequency (2.), and the amplitude (3.).

6 a) Use Function Generator to produce a 1000 Hz sine wave, 2 Vp-p. Display 2 3 cycles of waveform on the oscilloscope (Channel 0) with about 75% vertical occupation. b) Use the two cursors to measuree its amplitude and peak-to-peak (p-p) interval, then convert it to frequency. Additionally, the image below showss the Oscilloscope, whichh displays the channel measurement ts: RMS voltage, Frequency and the peak-to-peak voltage. When using the oscilloscope, make sure to Enable Channel 0 (1.). Also the oscilloscope allows you to adjust the Scale (2.), the time divisions (3.) and Graph Properties (4.) such as color and shape schemes. Furthermore, the Oscilloscope has a Log feature, which allows you to save your data for analysis at a later time.

7 3) Experiment 3 a) Build the following circuit to generate V and V C R = 1K Sine Wave 1000 Hz 2 V p-p p C = 0.1 μf V C V b) Measure V, and Channel 1 to measure V C. c) What is the phase difference between V and V C. In order to perform the task above, the first step is to connect the function generator by connection A0-GND+ to the negative terminal of thee capacitor and A0-0 to the positive end of the resistor (red wires) ):

8 For the next step connect A1-1+ to the positive end of the capacitor and A1-1- to the negative end of the capacitor (yellow wires): Finally, connect the A1-0+ to the positive end of the resistor and the A1-0- to the negative end of the capacitor (orange wires).

9 4) Experiment 4 Determining the internal resistance of a battery a) Build the following circuit to measure the internal resistance, R i R i R L = 100 Ω + - V battery =1.5

10 Grading Rubric: Laboratory Equipment for Measurement (Lab 1) Name: Points Cover Page / 4 Be sure to use the sample provided!!! I) Circuit Diagrams 1) Experiment 3 / 3 Be sure to label the resistor and capacitor with their measured values, not their labeled values. Also, the AC voltage source (the since wave from the function generator) should be properly labeled with its peak-to-peak magnitude and frequency. Finally be sure to label V and V C. Note: The peak-to-peak magnitude and frequency of V and V C don t have to be labeled. These are now experimental results. The purpose of the circuit diagrams is to accurately show your experimental set-up. 2) Experiment 4 Experimental Setup for Measuring R i / 3 For this circuit diagram, make sure the following are appropriately labeled: the voltage Source (V), the load voltage (V L ), the internal resistance of the battery (R i ) and the load resistance (R L ). Remember to label each with its measured value!! Everything but R i is part of the experimental setup and it should be labeled! II) Data and Results 1) Experiment 1 a) Data Table showing Continuity Testing Results / 5 2) Experiment 2 a. Graph of since Wave (1 khz, 2V pp ) / 4 Be sure to include a proper title, x-axis label, y-axis label and the proper units on the axes labels!! b. Measured Peak-to-Peak Amplitude: V pp [V] / 2 c. Measured Peak-to-Peak Interval (Time Period): T [s] / 2 d. Equation for Calculating Frequency from Time Period / 2 e. Calculated Frequency / 3 Show your WORK!! An incorrect answer will receive no credit and a partially worked answer will only receive partial credit. 3) Experiment 3 a) Measured value of R / 2 b) Measured value of C / 2 c) Graph of V and V C / 4 Please place V and V C on the same graph, not two separate graphs!! Be sure to include a proper title, x-axis label, y-axis label and proper units on the axes! d) Measured Value of Phase Difference (using quick measure) / 3 e) Measured Time Interval Between Peak of V and Peak of V C : t / 3 f) Equation for Calculating Phase difference between peaks / 2 g) Calculated Phase Difference based on time between peaks (SHOW WORK)!!! / 3

11 4) Experiment 4 b) Measured Open-Circuit (Source) Voltage: V / 2 c) Measured Value of Load Resistance: R L / 2 d) Measured Load Voltage: V L / 2 e) Equation for Determining Internal Battery Resistance, R i / 2 f) Calculated Value of R i (SHOW WORK)!!! / 5 III) Discussion 1) Experiment 4 a) For your experimental setup (measured source voltage and load resistance), how large would the internal resistance of the battery have to / 5 be for the load voltage to be less than 1.5V? b) We measured the load voltage to calculate the internal resistance of the battery. Can you come up with an experiment to determine the internal resistance of the battery based on measuring the current through the load resistor instead of the load voltage? Let the current through the load resistor be denoted by i L. Come up with / 5 an equation to calculate the internal battery resistance in terms of the lead current (i L ), the load resistance (R L ), and the open circuit (source) voltage (V). SHOW WORK!! 2) Post Lab Questions a) Post-Lab #1 / 5 b) Post-Lab #2 / 5 c) Post-Lab #3 / 5 d) Post-Lab #4 / 5 e) Post-Lab #5 / 5 IV) References / 5