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Wright BME 1110L - Lab 7P Handout

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Lab P7: PASCO Human Structures Arm ModelLab P7: PASCO Human Structures Arm ModelFilename: Team_**_BMEISE1110_0? _F14_LP7Insert your section number where question marks “?” appear. Insert your team number where stars (*) appear. In this lab you will be working with the PASCO human structures set arm model. You will be e-mailed a PASCO workbook file for this exercise.I. Model Setup1. The arm model should be positioned on the lab bench such that you are viewing it from either side. The forearm should be resting on the lab bench and there should be no tension in the pink cord connected to the load cell.2. Place four (4) of the slotted masses over the I-beam at the rear of the model. 3. Plug the biceps load cell into channel one of the load cell amplifier.4. Plug the load cell amplifier into the usb port of your PC.II. Load Cell Calibration1. Turn on your PC. NOTE: When the prompt “Are you sure you want to upgrade the following firmware? USBLink-A Firmware from version 2.5 to 2.7?” appears CLICK NO. ALWAYS CHOOSE NO FOR THIS PROMPT. 2. Open your e-mail and save the file you have been sent (Lab 7P Biceps Force vs. Load Mass) to the desktop.3. Open PASCO Capstone software. Start → Programs → PASCO Scientific → PASCO Capstone.4. Click on “Open Experiment”. Open the file you have just saved to your desktop.5. Click on the green calibration icon to the left of the table.6. When prompted to “Choose the type of measurement you would like to calibrate:” choose force. It should be the default and will already have been selected. Click “next”.7. When prompted to “Choose the probes you would to calibrate now:” check the Biceps Force” box, then click next.8. When prompted to “Choose the type of calibration you would like to perform:” select the “One Standard (1 point offset)” button then click next.9. Under “Calibrate the first point” Click “Set Current Value to Standard Value” then click next.10. Under “Review your calibration and accept” click on “finish”.11. Click on the green calibration icon again to close the calibration menu.12. Now click on the “Hardware Setup” icon.13. Click on the blue properties cogwheel and check the “Change Sign” box, then click OK.14. Click on the hardware setup icon again to close the hardware setup menu.III. Data Acquisition:1. Position the arm so the front edge is even with the edge of thelab bench and the elbow is hanging over the edge.2. Adjust the angle of the upper arm so that it is just clearing (not touching) the yellow cords behind it. Use the pink cord at the rear of the model to adjust the angle of the upper arm.3. Adjust the angle of the forearm with the pink cord toward the front of the model so that the forearm is level.4. Click on (highlight) the first cell under “Biceps Force” at 0 “Load Mass”.5. Click on the red preview circle at the bottom of the table.6. Click on the “Keep Sample” checkmark.7. Using the hooked mass set, hang the 10g mass from the loop at the end of the forearm, then click on the “Keep Sample” checkmark again.8. Repeat this procedure for all listed load masses. NOTE: For 30g and 40g, hang two masses together using the hanging bar at the bottom of each mass.9. Click on the red stop square.10. Increase (raise) the angle (a little) of the upper arm using the pink cord at the rear of the model.11. Repeat steps 3-912. Increase the angle of the upper arm again and repeat steps3-9.IV. Record Data:1. Click on the run number at the top of each of the “Biceps Force” columns.2. Choose Run #1 for the first column, Run #2 for the second column and Run #3 for the third “Biceps Force” column.3. Print the table (use the printer icon in the toolbar) and submit a copy to your TA along with the names of your team mates and team number. Only one copy for each team.4. Highlight the entire table and while holding down the ctrl key press the “c” key to copy the data.5. Open Notepad (Start → Programs → Accessories → Notepad).6. Click anywhere in the blank area and while holding down the ctrl key press the “V” key to paste the data.7. Save the file using a filename of your choice. NOTE: You may and should share this file with your team mates only.V. Cleanup:1. Return all masses to their holders and set them on your TA’s lab bench. 2. Shut down all programs and turn off your PC. 3. Disconnect the load cell from the load cell amplifier.4. Wrap up the cords of your load cells neatly or use a twist tie to do so.5. You may leave the arm model on your lab bench.6. Disconnect the load cell amplifier from your PC.7. Wrap up the cords of your load cell amplifier neatly or use a twist tieto do so.8. Return load cell amplifiers to the storage tote.VI. Assignment:1. This is a team assignment. Each team will prepare a formal lab report. Utilize the college standard (i.e. Times New Roman, 12 point font, double spaced) for the report. Included should be a cover page(similar to labs C5 & C6) including the team members names, team number, lab title and other relevant information. Include and properly caption all graphs, figures and equations. See the last page for proper captioning. Sections included should be:a. Introduction: Write about the experiment and its purpose.b. Background: Write about some cursory research you have done on the topic.c. Data & Results: Should include a properly captioned table andgraph of your data. Also include a properly captioned free body diagram using MS draw (insert → Shapes). Draw the free body diagram on a new MS word file. Don’t forget to insert arrows and text boxes to show the relevant forces. Copy/paste the diagram into your lab report as a picture. To properly caption figures d. Conclusions and Recommendations.e. Questions (below) and their answers.2. Each team must import their notepad file into excel and construct a graph with three plots (on the same graph) of “Biceps Force vs. Load”. If you wish, as an alternative, you may construct a plot of “Biceps Force vs. Load Force”. To convert load to load force, convert grams to kilograms and multiply by +g (9.81). Include title, appropriate axis labels and a properly labeled legend. Add a trendline for the 1st run only and show the equation on the chart. Type the following questions and their answers.a. When there was no mass hanging on the forearm why wasn’t the reading for “Biceps Force” at or near zero (0).b. In words describe what the trendline equation means.


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