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

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

3. 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.”

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

5. Social Impact
Developing world hospitals are plagued with faulty outlets
Power line tester will identify the faulty outlets and the problem
Expensive medical equipment will only be used in working outlets, saving the equipment and possibly people’s lives.

6. Developing Countries Reached By EWH
and more…

7. Performance Criteria Determine Voltage Present
Is the Outlet Wired Correctly?
Cost per unit: less than $5
Dimensions: 3 x 3 x 3” box
Operable temperature: 20°C to 40°C
Maintenance free
Humidity

9. Current Volt Testers Cost: $1.99 to $100+ Types Digital Display
Light Diode
Light Sensitive Diode

10. Outlet Wiring Open Ground Reversed Polarity Open Hot Open Neutral
Hot Ground Wiring Reversed
Hot on Neutral With Hot Open
Cost: $4.99

11. Voltage Indicator

12. Outlet Wiring Tester

13. Combination Circuit

14. Considerations Combining Devices Pricing?
Separate solution for each country
Cheaper to design for each individual electrical standard
We have determined that we can combined the circuits for each function in parrellel. This will keep cost down by using keeping duplicaiton of parts down. For example we only need one outlet hookup instead of two(one for each device)
In addition, separate solutions will keep cost down. Instead of having a devices with 20 lamps, we can have one with 3, or 5.

15. 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)
Nicaragua: A (120V, 60Hz)
Philippines: A, C (220V, 60Hz)
Tanzania: D,G (230V, 50Hz)
Ghana: D,G (230V, 50Hz)
Honduras: A (110V, 60Hz)
Sudan: C,D (230V, 60Hz)
Haïti: A (110V, 60Hz)
Sierra Leone: D,G (230V, 50Hz)
Liberia: A (120V, 60Hz)

16. Other Considerations

17. Validation Working Design Operable Temperature Humidity Dimensions
Pricing

18. Pricing total # Unit Price(1000) Price Per Device Breadboard 1 1.17618
Resistors 10
0.1222
Zener Diode
0.024
Lamps 5
0.332
1.66
LED
0.35
Casing
1.52
total

19. Questions???