• TDR900
  • Not in stock. Usually ships in 1-2 weeks


  • Extra large, high resolution backlit LCD
  • ±2% accuracy
  • Automatic output impedance control of 25, 50, 75, 100, 125 or 150 ohms
  • User-friendly menu on screen operation
  • Cable length calibration function
  • Internal library of 39 standard cable types
  • CE-Certificated

The Megger TDR900 Time Domain Reflectometer/Cable Length Meter is an advanced instrument capable of measuring cable lengths and finding distance to an open or a short using Time Domain Reflectometry. It offers exceptional features and a range capability normally associated with far more expensive instruments. The measurement range spans from 15 feet (5 m) to 10,000 feet (3 km) with a minimum resolution of 20 inches (50 cm).

The TDR900 can be used for any cable consisting of at least two insulated metallic elements, one of which may be the sheath or shield of the cable. The Meter has automatic internal matching networks to allow testing of 25Ω, 50Ω, 75Ω, 100Ω, 125Ω, or 150Ω cables. (These correspond to power, telephony, CATV, and LAN cables.)

The Meter can be closely matched to the cable under test using the menu selection keys. The propagation velocity value can be similarly adjusted to match the cable under test; thus ensuring an accurate distance measurement. The other user adjustable setting is changing the distance measurement units (feet or meters).

The Meter is housed in a rugged ABS enclosure which is dust and weatherproof to IP 42. The unit also comes with a soft carrying case and an alligator clip adapter. It is powered by 4 AA (NEDA 15A or NR 6) batteries, which are stored in a compartment on the back of the Meter. The batteries are held in a carrier for quick and easy replacement.

Installation and Repair technicians desire a portable test set for testing service drops and inside wiring during trouble ticket dispatches. The TDR900 connects to service drops or inside wiring and determines single or multiple cases of trouble to the customers' services. The Meter detects and displays cable issues, which do not meet the provider's facility criteria during the maintenance process. The TDR900 displays test results including: open, short, voltage detection and distance to fault in feet (meters). A tone generator is also built into the Meter for pair identification and tracing.

Construction and Maintenance technicians can benefit greatly from an easy-to-use test set capable of testing OSP cabling systems. The TDR900's exceptional measurement range accommodates testing in the subscriber network.