TDR-TA3.7 is a high-precision 2-channel reflectometer, for applications with increased requirements to the accuracy (for example, LAN, CATV networks, pipeline monitoring systems, etc.). TDR-TA3.7 allows to make the following measurements on cables lengths from 1 m to 128 km with a low instrumental error (up to 3 cm): Cable length measurement; determination the distances to all types of faults in the cable lines: break, short circuit and low-resistance faults, defective soldering, faulty amplifier, areas with high humidity, couplings, splices of cable, coils of Pupin, the weakness of pairs, «Flickering» defects; measurement of the coefficient of shortening of the line for a known length; cable line impedance estimation. TDR-TA3.7 is used for control during laying and operation of the following types of cable lines:  communication cables with metallic core; signal and control cables; power cables; aerial cable lines; computer networks (SCS, etc.); television and radio-frequency cable lines; to determine the length of the cable during its production, storage and trade.

TDR-TA3.7 is a deep modernization in terms of both hardware and software:

• Instrumental error is 3 cm (at VF = 1.499) - by increasing the effective sampling frequency to 3.2 GHz.
• Improved detailing of the waveforms – device receiver redesign allowed extension of the bandwidth.
• Extended ranges in range - from 15 m to 128 km: two additional "short" ranges of 15 m and 30 m to improve the efficiency of measurements in the near zone.
• A wide range of the pulse widths (from 10 ns to 50 μs) allows the operator to select the optimal resolution of the instrument and the overlapping attenuation. In short areas with little attenuation, it is better to use short pulses to provide the best resolution. On long routes with a large attenuation, longer pulse widths must be set to ensure maximum range.
• Digital averaging of 1...128 realizations allows to effectively suppress asynchronous noise.
• Two parallel physical channels make it possible to detect line differences in real time without storing the trace into memory.