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At-Home Lab Kit

Responsibilities. Problem. To perform experiments students must be in a certified lab with expensive test equipmentEngineers have no means of doing field testing except with cumbersome test equipment.Current at-home test equipment is PC based and most video cards do not have the capability to support high frequencies..

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At-Home Lab Kit

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    1. At-Home Lab Kit Advisor: Dr. Raymond Winton Professor of Electrical Engineering Mississippi State University

    2. Responsibilities

    3. Problem To perform experiments students must be in a certified lab with expensive test equipment Engineers have no means of doing field testing except with cumbersome test equipment. Current at-home test equipment is PC based and most video cards do not have the capability to support high frequencies.

    4. Design Constraints The At-Home Lab Kit should cost less than $200. Be able to be run off of either an external 110-V source or a 9-V battery. The function generator should have an output voltage swing between 0 and 9 volts. The oscilloscope will be able to display a frequency range of 1 to 300 kHz.

    5. What will a User be Able to do?

    6. User Interface of Lab Kit Hardware: Controls the voltage amplification, frequency multiplication, sec./div., and volts/div. Software: Monitors the settings of the sec./div., volts/div., trigger position, and controls the LCD controller of the oscilloscope.

    7. Block Diagram of At-Home Lab Kit

    8. Function Generator Implementation XR-2206 has the lowest sine wave distortion of .5%. XR-2206 has a power dissipation of 750 mW which is less than what can be achieved with discreet components. XR-2206 has the lowest supply voltage required of 9-26 V which meets requirement of using a 9-V battery.

    9. Low Frequency Test of Sine Wave Low Frequency Test: The low frequency for the sine wave was on an average about 1.05 Hz., for the triangular waveform the average low frequency is 1.06 HZ, and for the square it is 1.04 Hz.

    10. Signal to Noise Ratio Test for Square Wave at 5Khz Signal to Noise Ratio For the sine wave the S/N is 32.2 dB, for the triangular wave the S/N is 45.4 dB, and for the square it was 26.6 dB.

    11. Peak to Peak Voltage of Triangular Wave Peak to Peak Voltage Test The pk-pk voltage of the Sine Wave was averaged to be 4.02 V. Triangle Wave 3.98 V Square Wave 7.53 V

    12. Frequency Response

    13. Lab Testing Bandwidth 35 Hz Total Harmonic Distortion Sine = 0.6% Triangle = 0.3% Square = 0.4% Frequency Drift 0.1% to 0.3%

    14. Block Diagram of At-Home Lab Kit

    15. State Diagram For Monitoring

    16. State Diagram for Protocol

    17. Timing Diagram for LCD Controller

    18. Power Consumption and Battery Life of Kit The power requirements for the At-Home Lab Kit are as follows: Input Voltage 9 VDC Voltage needed to drive LCD -20 VDC Power Dissipated in Function Generator 750 mW Power Dissipated in Oscilloscope ______ Battery Life 200 hrs

    19. Cost Analysis of Prototypes The total parts cost of the prototype is about $150.00 Function Generator contributes about $20.00 Digital Oscilloscope contributes about $130.00

    20. Questions ??? ??? ??? ??? ??? ??? ??? ??? ???

    21. References

    22. References Cont.

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