VDV Works Virtual Hands-On Training Fiber Optics Testing: Using OTDRs   Part of the VDV Academy Fiber Optic Training Programs
Home Read About OTDRs  Dos & Don'ts  Tools  Setup Take Data Viewing the trace Measure Loss Modify Test Parameters Compare Traces Troubleshooting Quiz More Useful References  Understanding OTDRs "Virtual Hands-On" Termination "Virtual Hands-On" Testing	Test yourself 1. Identify the features shown in the OTDR trace:   2.What two parameters are measured by the OTDR ? (They are the X and Y Axes of the OTDR display.)   3. List two effects that will occur if a user increases the width of the OTDR pulse from the low range to the high range in the table below. 4. Besides measuring splice loss between the markers, most OTDRs can measure splice loss with another method. How do they do it? 5. In the trace below, where is the "dead zone" and how should the effect of the dead zone be accounted for? 6. Which of the reflections in the trace below is a "ghost"? How do you know? 7. What is the effect of different backscatter coefficients on either side of a splice? 8. What is the instrument used to find faults too close for the OTDR to see? 9. What does the OTDR actually measure the length of and what problem does that cause? 10. How can you determine which of the event(s) in the trace below have overloaded the OTDR? 11. There are a number of fluids that work well as index matching fluids to reduce reflections. Which two can you buy almost anywhere? 12. What information makes cable plant testing much easier? Check Your Answers
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