TDR900 Hand-held Time Domain Reflectometer/Cable Length Meter TDR900 Hand-held Time Domain Reflectometer/Cable Length Meter n Full autoranging for measuring the length of power, telephony, CATV and LAN cables, provides distance to an open or short. n Extra large, high resolution backlit LCD. n Automatic output impedance control of 25, 50, 75, 100, 125 or 150 ohms. n User-friendly menu on screen operation. n Cable length calibration function. n Internal library of 39 standard cable types. DESCRIPTION APPLICATIONS The Megger TDR900 is an advanced instrument capable of Telephony measuring cable lengths and finding distance to an open Installation and Repair technicians desire a portable test set or a short using Time Domain Reflectometry. It offers for testing service drops and inside wiring during trouble exceptional features and a range capability normally ticket dispatches. The TDR900 connects to service drops or associated with far more expensive instruments. The inside wiring and determines single or multiple cases of measurement range spans from 15 feet (5 m) to 10,000 feet trouble to the customers services. The Meter detects and (3 km) with a minimum resolution of 20 inches (50 cm). displays cable issues, which do not meet the providers facility criteria during the maintenance process. The The TDR900 can be used for any cable consisting of at TDR900 displays test results including: open, short, voltage least two insulated metallic elements, one of which may detection and distance to fault in feet (meters). A tone be the sheath or shield of the cable. The Meter has generator is also built into the Meter for pair identification automatic internal matching networks to allow testing of and tracing. 25, 50, 75, 100, 125, or 150 cables. (These correspond to power, telephony, CATV, and LAN cables.) Construction and Maintenance technicians can benefit greatly from an easy-to-use test set capable of testing OSP The Meter can be closely matched to the cable under test cabling systems. The TDR900s exceptional measurement using the menu selection keys. The propagation velocity range accommodates testing in the subscriber network. value can be similarly adjusted to match the cable under test thus ensuring an accurate distance measurement. Contractors/Installers The other user adjustable setting is changing the distance The TDR900 fills various applications ranging from cable measurement units (feet or meters). verification and fault location, panel mapping to cable The Meter is housed in a rugged ABS enclosure which is stock control. The Meter supports either electrical dust and weatherproof to IP 42. The unit also comes with a contractors or telecom/datacom contractors. soft carrying case and an alligator clip adapter. It is Contractors can verify cable lengths on buried service powered by 4 AA (NEDA 15A or NR 6) batteries, which drops before billing service providers. are stored in a compartment on the back of the Meter. The batteries are held in a carrier for quick and easy replacement.TDR900 Hand-held Time Domain Reflectometer/Cable Length Meter Electric Power FEATURES n CE-Certificated Street Lighting: To install street lighting, short lengths of cable run from lamppost to lamppost. It is important that n Accurate to 20 inches (50 cm) throughout the entire joints are accessible as the cable runs underground. The range TDR900 is used initially to ensure there is enough cable on n Extra-large backlit (ICON type 7 segment) LCD the drum to give a continuous run and then utilized to check the installation is correct. n Automatic output impedance control, auto-range, auto- zero, and auto-sensitivity allows for closely matching to Mining a wide range of cables under test. Only V.O.P (velocity Due to Ex d (Explosion proof) regulations most countries of propagation) settings required. do not allow TDRs down mines, however, as the mine deepens, shafts are dug from the surface and umbilical n Displays cable length if the cables V.O.P (velocity of cables are dropped down. These carry power for the tools propagation) is known or displays V.O.P (velocity of and telecommunication needs. Due to the distances propagation) if a cables length is known. involved, these cables especially the telecom, become n 20 internal memory locations store up to 20 custom stretched and are likely to fail. The TDR900 can easily be cable V.O.P settings. justified as a maintenance tool to check cable integrity. n Internal library of 39 standard cables allow for quick and Broadcasting easy measurements for industry standard cable types. Outside broadcasting: Outside broadcast vehicles carry n Tone Generator (oscillating 910 to 1100 Hz 5 V peak to an enormous amount of cables depending on the situation, peak) for cable identification and tracing. e.g. sporting events can use ten or more different camera locations. Due to the temporary nature of the installation, n Line Voltage Detection: Displays OUCH message and cables get damaged and a low cost, simple to read TDR stops operation if line voltage exceeds 6.5 V. can easily be justified to quickly locate failures. n Safety Protection (up to 250 V RMS) Studio Broadcasting: Cameras in a studio have a trailing group of cables, which are dragged around the floor, as SPECIFICATIONS the cameras move. This puts a strain both on the cable Except where otherwise stated, this specification applies at an and in the joints, as quality of the signal is very important. ambient temper of 68 F (20 C). Aerials: The signals from broadcasting companies are CABLE LENGTH MEASUREMENTS transmitted through aerials and large drops of cable are Range: Depends upon the V.O.P of the cables under test. used due to the height of these aerials. The cables 12,000 ft (3.7 km) V. O. P 99.9 become stretched especially around the joints, giving poor 9,800 ft (3.0 km) V. O. P 80.0 service. 8,000 ft (2.4 km) V. O. P 66.0 6,200 ft (1.9 km) V. O. P 50.0 Stocktaking Accuracy* A simple application is stocktaking. Any company that 2 % of reading + 20 inch (50 < 300 ft (100 m) purchases reasonable amounts of cable or any company 2 % of reading > 300 ft (100 m) that produces cable needs to know how much they are * This accuracy is effective for Coaxial Cables up to 8,000 feet, buying or have on the shelf. Traditional graphic TDRs Telephony Cables up to 6,000 feet, and Structured Wiring up to have had limited success in this area due to cost and 3,000 ft. waveform interpretations. The TDR900 provides both Resolution: 20 inches (50 cm) simplicity and accuracy. V.O.P (Velocity of Propagation): Adjustable from 1.0 % to 99.9 (in 0.1 % step) CABLE LENGTH CALIBRATION FUNCTION Allows you to measure the V.O.P, given as a percentage of the speed of light, of a known cable length. Required minimum length of sample cable: 30 ft (10 m)