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Construction Coordinator 1 to 2 Lesson 8
Terms in this set (10)
How many cable faults can a digital TDR (time domain reflectometer) detect at one time?
The type of time domain reflectometer (TDR) you use is affected by cost, personal preference, and technical specifications. If your job required that the TDR be able to generate cable signature displays, which TDR would you use?
Velocity of propagation (VOP) is the speed of the RF signals traveling in a coaxial cable relative to the speed of light. What is the range of VOP factors for broadband coaxial cable?
0.78 to 0.93
The time domain reflectometer (TDR) cannot find a fault located in the blind spot or dead zone of the cable. Where is the blind spot in a cable located?
Near the output of the TDR.
A time domain reflectometer (TDR) will measure through coaxial cable and many types of cable devices. Which type of device will a TDR not measure through?
An unpowered active device
A time domain reflectometer (TDR) can be used to test the impedance continuity of a new reel of coaxial cable. What is the purpose of testing the same cable for impedance continuity after it is installed?
To test for damage to the cable.
It is important to use safety precautions when using a time domain reflectometer (TDR) in order to avoid electrical shock. What is the primary source of the electrical hazard?
The voltages in the coaxial cable.
It is important to understand how to read the wave forms on the time domain reflectometer (TDR) because they can be distorted by anomalies such as echoes and blind spots. What causes an echo on a waveform TDR?
The extra distance that the TDR pulse travels after initially reflecting off the end of the cable span.
You want to check the blind spot of the coaxial cable for cable faults. Which of the following actions would be correct?
Measure the cable from the opposite end.
Certain ways of using a time domain reflectometer (TDR) are considered best practices, and are most likely to give you the most accurate results in the shortest amount of time. If you want to check a coaxial cable for faults and measure its length using the best practice, how would you set the pulse width?
Start with the shortest pulse width.
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