Detection and locating, measuring equipment
Water leak detectors, cable and pipe locators

Cable Fault Locator TDR-TA3.7USB

TDR-TA3.7USB is a complete functional analogue of the TDR-TA3.7 at a much lower price and size.

TDR-TA3.7USB designed to work in complex with PC.

TDR-TA3.7USB is a 2-channel cable locator, designed to determine the nature and location of a fault in any type of metallic cable lines. You can even use a TDR-TA3.7USB to troubleshoot and measure all types of twisted pair, coaxial and power cables, both aerial and underground.


Brief description

TDR-TA3.7USB allows you to define: opens, shorts, splices, splits and re-splits, bridged taps, water damage, crimps, cuts, smashed cables, shorted conductors, system components, and a variety of other fault conditions. In addition, TDR-TA3.7USB can be used to test reels of cable for length, shipping damage, cable shortages, cable usage, inventory management and documenting cable systems.

Distance – up to 64 km; Accuracy 12.5 cm, Pulse width from 10 ns to 50 μs.


The TDR RI-307USB can be used to:

  • Locate wet/corroded splices
  • Locate bridged taps
  • Locate unknown splices
  • Clear lines for ISDN, HDSL, ADSL
  • Find in-line components
  • Locate water in the cable
  • Locate load coils
  • Find splits and re-splits
  • Aid in measuring and verifying new or partial cable reels
  • Locate crushed, pinched or kinked cables
  • Locate opens, shorts, and partials in the cable
  • Locate bullet holes in the cable
  • Capture intermittent faults
  • Locate problems caused by construction
  • Document or map cable networks and conditions
  • Locate problems causing excessive loss of either AC or RF
  • Verify cable installations prior to acceptance
  • Detect theft of service
  • Help pinpoint ingress and egress problems

…and a variety of other cabling problems.


Ergonomics, visibility, comfort and performance


  • Made in the form of remote unit that connects to a PC via USB;
  • Control and display of measurement results on a PC;
  • Powered via USB (requires no batteries or power supply);
  • Direct control of measurement parameters to quickly and visually manage your measurements without wasting time to switch between menus;
  • High speed sensing allows the operator to see the most “live” image on the screen;
  • Dual-cursor measuring system can measure the distance between any two points of the trace – to exclude connecting cable length, measure the length of the cable becoming soaked, or the distance between the two connectors, the device indicates the distance to the first and second cursor, and the distance between them;
  • Automatic storing of measurement parameters.

Excellent measurement performance

  • A wide scale range from 62.5 m to 64 km;
  • Small instrumental error of distance measuring – 0.01% … 0.2% of reading allows to localize defects with an accuracy of up to 12.5 cm;
  • Wide pulse widths from 10 ns to 50 μs allows to the operator to select the optimum ratio resolution of the device and overlapped decay – in short segments cable or cables with little attenuation is better to use short pulses to provide the best resolution, on long cables or cables with high attenuation for maximum measurement distance, it is better to use longer probe pulse widths;
  • The high sensitivity of the receiving channel – 1 mV (dynamic range 80 dB);
  • Noise Filters – Digital averaging 1 … 128 times can effectively suppress asynchronous noise;
  • Two parallel physical channels to effectively suppress synchronous noise:
    • if the test cable lines are parallel (for example, two-phase), the interference in each of them the same, so to suppress the noise in the wavefowm of the damaged line it is enough to subtract from it the waveform of parallel undamaged line;
    • identify differences of the lines in real time without the need to save waveform to the memory.

Special modes of measurement and analysis

  • Simultaneous display of up to 5 waveforms – device has ability to display waveforms from two physical inputs and three traces of non-volatile memory;
  • Mode “difference” (point-wise subtraction) designed to detect differences in the TDR test, can be applied both to trace the physical channels and for the traces of memory in any combination in real time;
  • Mode “crosstalk detect” is intended to identify locations entangling pairs in couplings or twistings;
  • Mode “Capture” increases the effectiveness of the device to detect unstable defects (“flickering” defects) – this mode, the device stores the on-screen waveform arbitrarily long period of time, so that short-term events are not missed.



Parameter Value
Display used personal computer display
Supported operating systems Microsoft Windows XP/7/8
The range of distance measurement (time delay) from 0 to 64000 m (from 0 to 640 μs)
Subranges measurements 0 – 62.5 m (0 – 0,625 μs), 0 – 125 m (0 – 1.25 μs), 0 – 250 m (0 – 2.5 μs), 0 – 500 m (0 to 5 μs); 0 – 1000 m (0 – 10 μs), 0 – 2000 m (0 – 20 μs), 0 – 4000 m (0 – 40 μs), 0 – 8000 m (0 – 80 μs), 0 – 16000 m (0 – 160 μs), 0 – 32000 m (0 – 320 μs), 0 – 64000 m (0 – 640 μs)
Instrumental error of the distance measurement from 0.01% to 0.2% of reading (from 12,5 cm to 8 m depending on the subranges)
Effective sampling rate 800 MHz
Range of impedance matching from 25 Ω to 600 Ω
Pulse width from 10 ns to 50 μs
Pulse amplitude 10 V on matched load
Sensitivity receiving tract 1 mV
Dynamic range 80 dB
VOP 33.33% … 99.99% (step 0.01%)
Power supply Powered via USB (requires no batteries or power supply)
Time of continuous operation via USB Unlimited
Overall dimensions 175х95х47 mm
Operating Temperature Range from -20 °С to +40 °С
Weight of device not more than 0.3 kg

Standard set

Standard set:

  • Cable fault locator TDR-TA3.7USB
  • Connecting cable
  • USB cable



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