Megger TDR900 Cable Length Meter
The Megger TDR 900 Hand-Held 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 that would be 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 Megger 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. This TDR and Cable Length Locator 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 Megger TDR 900 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.
Megger TDR900 Hand-Held Time Domain Reflectometer / Cable Length Meter Features:
- Full autoranging for measuring the length of power, telephony, CATV and LAN cables, provides distance to an open or short.
- Extra large, high resolution backlit LCD.
- 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
- Tone generator for cable identification and tracing
- Line voltage detection, stops operation if line voltage exceeds 6.5V
- Internal memory locations to store up to 20 custom VOP settings
- Displays cable length if cable's VOP is known
- Displays cable VOP if cable's length is known
- Accurate to 50cm throughout the entire range
- Automatic Output Impedance Control, Auto-range, Auto-zero & Auto-sensitivity allowing for close matching of cables under test
Megger TDR900 applications:
Telephony: The device connects to service drops or inside wiring and determines single or multiple cases of trouble to the customers’ services. It displays test results including: open, short, voltage detection and distance to fault. 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 TDR's exceptional measurement range accommodates testing in the subscriber network.
Street Lighting: To install street lighting, short lengths of cable run from lamppost to lamppost. It is important that joints are accessible as the cable runs underground. The TDR 900 is used initially to ensure there is enough cable on the drum to give a continuous run and then utilized to check the installation is correct.
Mining: Due to Ex ‘d’ (Explosion proof) regulations most countries do not allow TDRs down mines, however, as the mine deepens, shafts are dug from the surface and umbilical cables are dropped down. These carry power for the tools and telecommunication needs. Due to the distances involved these cables, especially the telecom, become stretched and are likely to fail. The Megger can easily be used as a maintenance tool to check cable integrity.
Broadcasting: Outside broadcast vehicles carry an enormous amount of cables depending, due to the temporary nature of the installation cables get damaged. Cameras in a studio have a trailing group of cables, which are dragged around the floor, as the cameras move. This puts a strain both on the cable and in the joints, as quality of the signal is very important. The signals from broadcasting companies are transmitted through aerials and large drops of cable are used due to the height of these aerials. The cables become stretched especially around the joints, giving poor service. Megger's cable length meter can easily be used to quickly locate any failures.
Stocktaking: A simple application is stocktaking. Any company that purchases reasonable amounts of cable or any company that produces cable needs to know how much they are buying or have on the shelf. The Megger TDR900 Cable Length Meter provides both simplicity and accuracy.
- Megger TDR900 Hand-Held Time Domain Reflectometer/Cable Length Meter
- Alligator clip adapter
- User manual
- Soft carrying case
1 Item(s)per pageQ: How do you set the 900 up when a run of cable consists of 3 or more type cables? Thank You Posted On: 06/02/2014 By: Michael HornA: Hi Michael, thank you for your question. You would not be able to achieve an accurate measurement because each cable type would have its own Velocity of Propagation (VOP). You would have to test each cable separately by selecting the cable type on the instrument.
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