Megger TDR500/3 Time Domain Reflectometer



  • Locate cable faults up to 5km away.
  • Locate faults on all metallic cables.
  • Minimum resolution of 0.1 m and a 5 km maximum range.
  • Trace HOLD feature to allow comparison between cables.
More Information
Warranty1 year
Price MatchYes

Megger TDR500/3 Time Domain Reflectometer

Made for use with metallic cables, the TDR500/3 is used for precisely locating cable faults over a wide distance.

Handheld and compact for ease of use, the TDR500/3 is suitable across a range of 5km/15kft (depending on velocity factor selected and the type of cable). It has four selectable input impedance (25, 50, 75 and 100Ω) and a velocity factor between 0.2 and 0.99.

The TDR500/3 is one of the only handheld TDRs on the market with a trace HOLD function, allowing the trace to be frozen on the screen for ease of use.


  • Simple to use - rotary dial and cursor keys
  • Automatic setup for instant use
  • Ultra fast pulse for near end fault identification
  • IP54 rated
  • Trace hold function
  • Suitable for use on metallic cable pairs
  • Backlit monochrome graphical LCD display with adjustable contrast
  • Resolution to 0.1m
  • For use on telecom TNV-3 circuits or 150 CAT IV power circuits
  • Doesn't require a power blocking filter
  • Display distance in metres or feet
  • Powered by 5 x AA (LR6) batteries


Ranges10 m, 25 m, 100 m, 250 m, 1000 m, 2500 m, 5000 m 
(30 ft, 75 ft, 300 ft, 750 ft, 3000 ft, 7500 ft, 15000 ft)
Accuracy±1% of range ± pixel at 0.67 VF
[Note- The measurement accuracy is for the indicated cursor position only and is conditional on the velocity factor being correct.]
Resolution1% of range
Input ProtectionThis instrument complies with IEC61010-1 for connection to live systems up to 150V CAT IV when used with the optional fused test lead set
Output Pulse5V peak to peak into open circuit. Pulse widths determined by range and cable
GainSet for each range with three user-selectable steps (in manual operation mode)
Velocity FactorVariable from 0.2 to 0.99 in steps of 0.01
TX NullAutomatic
Power DownAutomatic after 5 mins with no keys pressed
BacklightStays on for 1 minute with no keys pressed
Batteries5 x LR6 (AA) batteries, manganese alakli or nickel metal-hydride cells
Battery LifeUp to 14 hours (typical)
Dimensions230mm x 115mm x 48mm


What's Included?

  • Megger TDR500/3 Time Domain Reflectometer
  • Hard Carrying Case
  • Miniature Clip Test Lead Set
  • User Guide CD
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