Which test equipment is used to measure cable lengths and locate faults on twisted pair and coaxial cable?

The time domain reflectometer (TDR) is the correct choice for measuring cable lengths and locating faults on both twisted pair and coaxial cables. This tool works by sending a pulse of electrical energy down the cable and measuring the time it takes for the pulse to reflect back. This reflection occurs when there is a change in impedance in the cable, such as at a fault or the end of the cable. By calculating the time it takes for the signal to return, the TDR can accurately determine the length of the cable and pinpoint the location of faults.

In contrast, while an optical time domain reflectometer (OTDR) is similar, it is specifically designed for measuring fiber optic cables, and thus is not suited for twisted pair or coaxial cables. A multimeter, on the other hand, is primarily used for measuring voltage, current, and resistance but does not provide the necessary capability to evaluate the characteristics of a transmission line or locate faults effectively. Lastly, a network analyzer is used for assessing network performance and signal integrity rather than for locating physical faults in cabling installations.