Cable Fault Locator
TDR RI-307М3 “SWIFT” High-precision 2-channels

Cable Fault Locator TDR RI-307M3 – advanced features high-precision  2-channel Time Domain Reflectometer (TDR) designed to determine the nature and location of a fault in any type of metallic cable lines: all types of twisted pair, coaxial and power cables, both aerial and underground.

TDR RI-307M3 cable fault locator

TDR RI-307M3 cable fault locator overview

You can even use a TDR RI-307M3 to troubleshoot and measure all types of twisted pair, coaxial and power cables, both aerial and underground.

TDR RI-307M3 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 RI-307M3 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 128km;  Accuracy 3 cm, Pulse width from 10 ns to 50 μs

Ergonomics, visibility, comfort and performance

  • Large bright color TFT 5.7 inches display with a resolution of 640×480 pixels and a wide viewing angle for ease of use and visual presentation of the results of measurements;
  • 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 – when you turn off the device (or select Turn Off Timer Auto) measurement parameters are stored in non-volatile memory, so it is turned on again you will not have to re-install measurement parameters.

Excellent measurement performance

  •  A wide scale range  from 15 m to 128 km;
  • Small instrumental error of distance measuring – 0.01% … 0.2% of the current scale allows to localize defects  with an accuracy up to 3 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 to use long pulse widths;
  • 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;

Waveform storage and computer interface

  • A large amount of non-volatile memory to store the waveform library and table velocity factor;
    • the device can store non-volatile memory and 200 named and dated waveforms with high resolution (up to 8000 pixels on one waveform), which allows a detailed study of the measurement results and track their dynamics for a for a long period of time;
    • instrument is equipped with an expandable built-in table  of  the velocity factors for many cable types ;
  • USB-port for easy data exchange with PC
    • appliance is equipped with USB-port for read / write trace and table velocity factor to an external USB-drive;
  • Extendable the functionality of the firmware
    • easy and secure firmware update via USB-drive will allow you to – to expand the functionality of the device, and we respond quickly to your requests and suggestions to improve the device;

Ready for outdoor use

  • Rugged, sealed case (protection class IP67);
  • Dust and water tightt keyboard;
  • Wide temperature range -20oC … 40oC;
  • Powerful Li-Ion battery allows a long time without recharging – continuous operation time on battery power for at least 8 hours, and Auto Power Off function will not allow discharge device;
  • Speed charger can quickly charge the device for a few minutes, while providing sufficient time for the measurement;
  • Small dimensions 70x246x124 mm and weight is not more than 2.5 kg


TDR RI-307M3 cable fault locator technical specifications

DisplayColor TFT 5,7” (640х480 pix)
The range of distance measurement (time delay)from 0 to 128000 m (from 0 to 1280 μs)
Subranges measurements0 – 15.625 m (0 – 0,15625 μs), 0 – 31.25 m (0 – 0,3125 μs), 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), 0 – 128000 m (0 – 1280 μs)
Instrumental error of the distance measurementfrom 0.01% to 0.2% of reading
from 3,0 cm to 8 m depending on the subranges
Effective sampling rate3200 MHz
Range of impedance matchingfrom 25 Ω to 600 Ω
Pulse widthfrom 10 ns to 50 μs
Pulse amplitude10 V on the matched load
Sensitivity receiving tract30 mV
VOP33.33% … 99.99% (step 0.01%)
Continuous operating time on battery powerat least 8 hours
Time of continuous operation through the power supplyUnlimited
Overall dimensions70х246х124 mm
Operating Temperature Rangefrom -20 °С to +40 °С
Weight of device with batterynot more than 2.5 kg

Delivery contents

TDR RI-307M3 cable fault locator delivery contents:

Delivery contents

Time Domain Reflectometer TDR RI-307M31 pc.
Power adapter (charger) AC-DC 12V1 pc.
Connecting cable 5 m, 75 Ohm,  BNC.M-alligator-clips1 pc.
Connecting cable 0.1 m, 75 Ohm, BNC.M-crocodiles1 pc.
User Manual TDR RI-307M31 pc.
CD disk with software and documentation1 pc.
Accessory bag1 pc.

Additional equipment

Voltage protection unit UP-1 for operation on cables under voltage up to 380 V;
High power charger (mains supply unit)
USB flash drive
Extension cable 5 m, 75 Ohm, BNC.M-BNC.F
Connecting cable 1.5 m, 75 Ohm, BNC.M-crocodiles 25.4  mm
Connecting cable     0.1 m, 75 Ohm,   BNC.M-crocodiles
Adapter BNC.M – terminals
USB Flash Drive


TDR RI-307M3 cable fault locator Certificates

Russian Federation : The device is certified by the State Standard of Russia and entered in the State Register under No. 62757-15. & nbsp; Certificate of type approval of measuring instruments RU.C.27.004A. # 61012

Republic of Belarus : The device is registered in the State Register of Measuring Instruments of the Republic of & nbsp; Belarus under No. RB 03 16 7044 19. Certificate No. 12607 on & nbsp; type approval of measuring instruments.

Republic of Kazakhstan : & nbsp; The device is registered in the register of the State System for Ensuring the Uniformity of Measuring Instruments of the Republic of Kazakhstan under No. KZ.02.03.00202-2019 / 62757-15. Certificate No. 202 on recognition of the type of measuring instruments



TDR-RI307M3: device overview using cable length measurement as an example