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Time Domain Reflectometry: Applications, Theory, Setup, and Data Analysis in Senior Design Lab

This comprehensive overview of Time Domain Reflectometry (TDR) covers its applications in measuring transmission line lengths, fault analysis, wave speed, and understanding physical properties of materials. It details essential theoretical principles, such as voltage reflection coefficients and calculated parameters including line capacitance and inductance. Practical considerations for TDR equipment setup, limitations including bandwidth and sampling rates, and the importance of accurate data interpretation are also discussed. Ideal for senior design projects, this guide emphasizes practical applications and theoretical foundations of TDR.

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Time Domain Reflectometry: Applications, Theory, Setup, and Data Analysis in Senior Design Lab

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  1. Time Domain Reflectometry ECE 345 Senior Design Lab

  2. Time Domain Reflectometry • Applications • Theory • Equipment Setup • Data Analysis • Limitations

  3. Applications • Transmission Line Length • Fault Analysis • Wave Speed • Physical Properties

  4. Transmission Line Length • Good for when you need to know the length of inaccessible lines

  5. Fault Analysis • Good for deciding where to look for problems

  6. Wave Speed • Good for determining performance of lines connecting computers and communication equipment

  7. Physical Properties • Relative Permittivity of Dielectric (r): r = (3x10^8/wave speed)^(1/2) • Line Capacitance (C): C = r^(1/2)/(Zo x 3x10^8) • Line Inductance (L): L = [(wave speed^2) x C]^-1

  8. Theory

  9. Theory • V+ = Vo(Zo/(Rg + Zo)) • V- = (V+)(Rload - Zo)/(Rload + Zo) •  = (V+)/(V-) = (Rload - Zo)/(Rload + Zo) •  = -1 for Rload = 0 •  = 1 for Rload =  •  = 0 for Rload = Zo

  10. Theory • Bounce Diagram

  11. Equipment Setup

  12. Limitations • Oscilloscope Bandwidth • Oscilloscope Sampling Rate • Data Interpretation • Availability of Literature(cable data) • Price

  13. Limitations

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