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T ime D omain R eflectometry

T ime D omain R eflectometry. ECE 345 Senior Design Lab. Time Domain Reflectometry. Applications Theory Equipment Setup Data Analysis Limitations. Applications. Transmission Line Length Fault Analysis Wave Speed Physical Properties. Transmission Line Length.

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T ime D omain R eflectometry

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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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