Time Domain Reflectometry (TDR) is a useful method to diagnose a transmission li

Question

Time Domain Reflectometry (TDR) is a useful method to diagnose a transmission line and its impedances, particularly if you can't directly measure the power line. Visually inspecting miles of cable is really difficult, and that's of course IF the damage is visual. A snowstorm has just knocked out a neighborhoods electricity, and you've been called in to diagnose the power line. You pick a point in the middle of the line and measure the voltage when a constant 1V signal is turned on at one end. You observe the following. What is the problem with the power line? Justify your answer. A. Short circuits on both ends B. Open circuits on both ends C. Short circuit where signal was injected, open circuit on other end D. Open circuit where signal was injected, short circuit on other end

Explanation / Answer

Dear student,

Correct answer is Option 3

Remember when there is an open circuit voltage would be high and current is zero. While for a short circuit voltage is Zero and current is maximum.

Now from the waveform when we inject the signal voltage is Zero for some duration ( Till t= 0.5 ps ) which means short circuit where signal was injected and and at t = 0.5 ps the voltage is maximum which means there is an open circuit on the other end.

Thank you. Have a Nice Day.

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.