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 improve 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, is the power fluctuating and third, is the outlet wired correctly

5. Developing Countries Reached By EWH
and more…

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)
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)

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

8. Circuit Design-Current Analysis
Power tester needs to tell user 3 things:
Voltage Present
Is the Power Fluctuating?
Is the Outlet Wired Correctly

9. Current Volt Testers Cost: $3.99 to $100+ Types Digital display
Light Diode
Light Sensitive Diode

10. Power Fluctuation P=Vi Do we need to know the actually power?
Power fluctuation is typically cause by poor grounding and improper wiring, a short circuit and even lightning.
Will testing for common problems be sufficient?

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

13. Considerations How does each device work? How Can we combined devices?
Pricing?
Commercial power line tester costs >$5
All in one or separate devices?
Lowest Cost with Maximum Quality
How does each device work?
Talk about the need to understand how the current devices work. Tell them that we have taken apart the device in the picture which test for proper wiring of device. Also we have taken apart a multimeter and are trying to understand both.
How Can we combined devices?
Is it possible to combind devices,
Pricing?
-The price to acquire the devise that do all three of our needed functions are well over $5. How can we reduce cost?
-Will combining device make it cheaper or more expensive. Combing devices will reduce needed material but will it increase the completely of the circuit; thereby increasing cost?
-Whatever the case may be we need to strive to keep cost low and quality high.

14. Goals Understand circuitry for each function Design Device
Determine Pricing and redesign until price is less than $5
Patent Search
Build and Test the Device?
Mass Production and Distribution to Developing World
Just highlight each point and add whatever you can.

15. Questions???