1. Power Line Tester Group 21: David Slifer Charles Wu Benjamin Humphrey

2. Problem Statement Design a power line tester for use in hospitals in the developing world that can determine the voltage present, is the power fluctuating and third, is the outlet wired correctly

3. Performance Criteria Cost per unit: less than $5 Dimensions: 3 x 3 x 3” box Operable Temperature: 20°C to 40°C Maintenance free

4. Background Engineering World Health works in many countries helping improve the quality of life by improving medical care. Repair of medical devices Repair of medical devices Training in usage of medical devices Training in usage of medical devices Most of the goals of EWH are accomplished through a summer program for undergraduates.

5. Background “The students found that modern equipment that is often taken for granted in U.S. hospitals is in short supply in developing- world hospitals, which struggle simply to operate with uninterrupted electricity.”

6. Electrical Standards and Plug Types Each country has its own electrical standard and outlet configuration and similarities are rare. El Salvador: A, C, G, I, J, L (115V, 60Hz) El Salvador: A, C, G, I, J, L (115V, 60Hz) Nicaragua: A (120V, 60Hz) Nicaragua: A (120V, 60Hz) Philippines: A, C (220V, 60Hz) Philippines: A, C (220V, 60Hz) Tanzania: D,G (230V, 50Hz) Tanzania: D,G (230V, 50Hz) Ghana: D,G (230V, 50Hz) Ghana: D,G (230V, 50Hz) Honduras: A (110V, 60Hz) Honduras: A (110V, 60Hz) Sudan: C,D (230V, 60Hz) Sudan: C,D (230V, 60Hz) Haïti: A (110V, 60Hz) Haïti: A (110V, 60Hz) Sierra Leone: D,G (230V, 50Hz) Sierra Leone: D,G (230V, 50Hz) Liberia: A (120V, 60Hz) Liberia: A (120V, 60Hz)

7. Considerations How does a power line tester work? Components Involved? Components Involved?Pricing Commercial power line tester costs >$5 Commercial power line tester costs >$5 Find inexpensive components Find inexpensive components Lowest Cost with Maximum Quality Lowest Cost with Maximum Quality

8. Other Considerations How to deal with the different electrical standards How do we deal with the different plug configurations Efficiency Human Psychological factors

9. Questions???