Hand-Held TDR / Cable Length Meter – Megger TDR900


The Megger TDR900 is an instrument capable of measuring cable lengths and finding the 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 5 m to 3 km with a minimum resolution of 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.

  • Measures length of power, telephony, CATV & LAN cables
  • Determines distance to an open or short
  • Automatic impedance control (25, 50, 75, 100, 125, 150W)
  • Internal library of 39 standard cable types
  • Memory for 20 custom cable settings
  • Tone generator for cable tracing
  • Large, high resolution backlit LCD display

Additional Features:
Cable Calibration function allows measurement of V.O.P. (Velocity Of Propagation) in a known cable length. Requires at least a 30ft (10m) sample. Line Voltage Detection feature displays “OUCH” message and stops operation if voltage exceeds 6.5V. Supplied with soft carrying case and alligator clip adapter.

Catalog Page 173a                    TDR900 Datasheet

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products found
Item # Range Accuracy Resolution Velocity Of Propagation Connector
ME/TDR90012000 ft (3.7km) at 99.9 V.O.P. 6200 ft (1.9km) at 50.0 V.O.P. 8000 ft (2.4km) at 66.0 V.O.P. 9800 ft (3.0km) at 80.0 V.O.P.±2% of rdg ±20" at 300 ft20 inches (50cm)adjustable from 1.0% to 99.9% of the speed of lightBNC
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