Table of Contents
What is the cost of OTDR?
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How many OTDR are there?
OTDR Types The two predominant categories are bench-top and hand-held. A bench-top OTDR is essentially a feature-rich instrument with a direct AC power source, whereas a hand-held or compact OTDR is typically a lightweight, battery-powered device intended for use in the field.
What is the function of a time domain reflectometer TDR )?
Time domain reflectometers (TDR) are test devices that generate an energy pulse or step on the cable to determine the location and magnitude of cable faults, breaks, splices, terminations, or other events along the length of a conductive cable.
What is the working principle of OTDR?
An OTDR sends short pulses of light into a fiber. Light scattering occurs in the fiber due to discontinuities such as connectors, splices, bends, and faults. The OTDR then detects and analyzes the backscattered signals.
What is pulse rate in OTDR?
In an OTDR, the pulse carries the energy required to create the backreflection for link characterization. The shorter the pulse, the less energy it carries and the shorter the distance it travels due to the loss along the link (i.e., attenuation, connectors, splices, etc.).
How far can an OTDR test?
Assuming typical fiber attenuation of 0.20 dB/km at 1550 nm and splices every 2 km (loss of 0.1 dB per splice), a unit such as this one will be able to accurately certify distances of up to 120 km.
Is TDR accurate?
The TDR is an extremely accurate instrument. However, if cable system parameters and constants are in error, they might cause incorrect data interpretation. For the specific TDR case, knowing the parameters or propagation constants is imperative: they are necessary for any analysis of TDR signals.
How is TDR calculated?
The formula for determining this is: l = t x v/2, where l is length, t is time and v is velocity. The TDR instrument measures the time it takes for the pulse to return. If the exact length of cable is known, then the formula can be used to determine the propagation velocity.
How do you perform an OTDR test?
- Turn on OTDR and allow time to warm-up.
- Clean all connectors and mating adapters.
- Attach launch cable to OTDR. Attach receive cable (if used) to far end of cable.
- Set up test parameters on OTDR.
- Attach cable to test to end of launch cable. Attach receive cable (if used) to far end of cable.
- Acquire trace.