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Cable Fault Locators
Cable Fault Locators

GAOTek TDR Cable Fault Locator

ID: A0080005tek

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Product Description


GAOTek TDR Cable Fault Locator device is designed to measure the faults which can be broken line, cross faults on plastic cables and lead covered cables. GAOTek Time domain Reflectometer (TDR) Cable Fault Locator is a portable, lightweight device is an effective tool to reduce troubleshooting time, improve work efficiency and reduce labor intensity of line maintenance staff. It can also be used for inspection of electrical cables. It has a USB interface for wave form transmission and analysis.

Key Features

  • Portable, Light weight device.
  • Top grade ARM single chip microcomputer.
  • More precise test result and faster processing speed.
  • No test dead zone.
  • User friendly operation interface.
  • Six function keys to do all the tests.
  • Large colorful LCD display.
  • High energy Li battery with 10 hours continuous working condition.

Technical Specifications

Working Range 4.97 mi (8 km)

9.94 mi/19.88 mi (16 km/32 km)- Optional

Highest Resolution 3.28 ft. (1 m)
Dead Zone 0ft. (0m)
Power Consumption 1 W
Weight 0.92 lbs (0.42 kg)
Dimension 7.87 in x  3.54 in x  1.69 in (200 mm x  90 mm x  43 mm)
Operating Temperature 5 ˚F to 113 ˚F (-15 ˚C to + 45 ˚C)
Storage Temperature -4 ˚F to 131 ˚F (-20 ˚C to + 55 ˚C)

Ordering information:

This package includes

Item Quantity
GAOTek TDR Cable Fault Locator 1 pcs
Rechargeable battery and charger/adapter 1 pcs
Test Line 1 pcs
CD(For USB Function) 1 pcs
U-disk(For USB function) 1 pcs
User Guide 1 pcs
Waterproof Carrycase 1 pcs

Testing principles:

Steps of Locating Fault Point:

  1. Diagnosis of Fault Characters.
  2. Fault Testing.
  3. Locating Fault Point.


  1. Diagnosis of Fault Characters.

The characters of telecom cable faults can be divided into the following kinds:

  • Broken Line
  • Crossed Line
  • Earthing Fault
  • Crosstalk Noise
  • Bad Insulation
  1. Fault Testing:
    • To detect the fault cut off the cable from both ends either from lines or from equipment.
    • Make sure the cable to be tested or free of voltage.
    • Using this instrument detect using intelligence test first, if the fault cannot be detected then test should be done using Manual Testing.

Intelligence Auto Testing:

Switch on the instrument by pressing the “ON” button. Connect the lead line and fault cable line. Press the “AUTO” button the instrument will show the testing result by pressing the “AUTO” button.

Note: The default setting of wave velocity is 200m/µs. To perform Intelligence testing user should check whether need to adjust the velocity.

Reference value for common cable wave velocity:

Insulators Signal propagation Velocity(m/µs)
High Polymer 168-186
Filled polythene 192
Polythene 201
Teflon 213
Paper pulp 216
Foamed polyethylene 246
Paper 264

 Manual Testing:

The manual testing can be performed by adjusting the setting and parameters. The relevant setting and parameters will demonstrate on the underneath of the display screen.

  • Press “OK” button to adjust parameter and settings.
  • GAIN- “Gain XX” shows reverse color display. “▲” or “▼” to display the amplitude (1~99 adjustable).After adjusting Gain press “PULSE” the screen will display the wave.
  • Range- During manual testing range decides the maximum testing distance of the instrument. To adjust the Range, press “OK”, until “Range xx” shows reverse color display. Press “▲” or “▼” to adjust the Range.
  • VOP- The precision of the wave velocity, directly affect the precision of the testing result. So the wave velocity shall be calibrated according to the cable characters. Press “OK”, until “VOP xx” shows reverse color display. Press “▲” or “▼” to adjust the Wave Velocity. Adjust the Range and VOP according to the characters and estimated length of the cable to be tested. Appropriately adjust the wave amplitude on the display screen to be observed easily. Move the cursor to inflection of the reflected waveform. The fault distance will demonstrate on the underneath of the display screen.
  1. Locating Fault point:

Tester will judge the approximate fault point location. Based on the testing result, then check with the cable, cable gland and cross boxes etc.

Pulse Testing:

It’s a kind of remote testing method. Fault point can be located without testing on the field (end to end co-ordination).

Formula for Pulse Testing:

Suppose the pulse transmission velocity in electric cable velocity is V, the come and back time that the pulse travels between the test point and the fault point is T, the fault distance is L, then:

  • 2L = V T
  • L = V T/2


  • Current battery power is showed at the top-right of the
  • If the battery power is inadequate, use the instrument charger to charge it.
  • The indicator light of the charge adapter will be red when charging; and it will turn green after it is fully charged.


  • Keep display screen away from direct sunlight.
  • The contrast ratio of LCD will drop when temperature higher than 140 ˚F (60 ˚C) and it will return to normal when temperature is lower than 140 ˚F (60 ˚C).
  • Before testing, measure the voltage of fault cable to be tested, in order to avoid test errors.
  • Do not hit LCD screen.

Additional Information

Weight 0.92 lbs


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