T-900 Hand-held TDR

The T-900 is an easy to use, compact hand-held instrument for accurately locating open-circuit and low-impedance faults on metallic cables, using time-domain reflectometry (TDR). Comparison of TDR traces from the three phases of a faulty cable, can be used to identify differences between them, providing another useful aid to fault location.

The unit can also calculate the velocity of propagation (VOP) of a known length of cable or measure the length of cable on a drum, where the VOP is known.


  • Available in three versions with 8, 16 or 32km range
  • Digital gain control
  • Data transfer via USB flash memory for analysis on PC
  • Automatic waveform identification eliminates dead zone
  • Automatic impedance matching
  • Large colour display with simple user interface
  • 10 hours operation on one battery charge
  • Resolution to 1m


Technical Parameters Parameter Value
Range 8km (16 and 32km are also available as options)
Accuracy ±0.5% of range
Resolution Minimum resolution 1m
Pulse ±30v, 40ns-10us with automatic adjustment
Sampling rate 100MHz
Balance 25 – 300Ω automatically adjusted
Velocity of propagation 40-300m/µs
Dead zone There is no dead zone
Power consumption 1W
Batteries Lithium, 2 pcs of 18650 batteries in series
Charger Input: AC110-240V, output: 8.4V
Battery life 10 hours
Dimensions 204 x 100 x 36 mm
Weight 0.38kg
Operating temperature -15oC to +50oC
Ingress Protection IP53

Delivery includes:

  • TDR Cable Fault Locator
  • Test Leads
  • Battery charger
  • Carry bag
  • User manual
  • CD with management software
  • USB flash memory

T-900 Datasheet

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