What does a Time Domain Reflectometer (TDR) primarily check for in cables?

A Time Domain Reflectometer (TDR) is primarily used to detect faults in cables. It works by sending a pulse down the cable and measuring the time it takes for the reflection of that pulse to return. If the cable is in good condition, the pulse will travel to the end and return without issue. However, any discontinuity—such as a break, short, or other defects—will cause a reflection at the point of the fault. The TDR measures this reflection to determine the location and nature of the fault, making it an essential tool for diagnosing issues in various types of cables.

Other considerations, like the strength of the signal, bandwidth capacity, and insulation quality, are important in their own right, but they are not the primary function of a TDR. The tool is specifically designed to identify the presence and location of faults, which helps technicians assess and troubleshoot cable integrity effectively.