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0 reviews | Model: OWL VOLT-1
Visual Optical Length Tester
List Price: $435.00
Your Price: $334.62
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VOLT stands for Visual Optical Length Tester, and offers a unique, low-cost alternative for users who need to measure the length of optical fibers. Fiber installations are increasingly required to have fiber length measurements to comply with bid requirements. Rather than purchase certification test sets that can cost thousands of dollars, the VOLT can be added to an installer’s existing fiber test kit. These length testers use a “round-robin” method of measuring fiber length. This is accomplished by looping back two fibers at one end of the fiber run with a patch cord. The round trip time that the light takes to travel through both fibers is converted to length in kilometers, then divided by two to show the length of the fiber cable. There is no need to measure the length of all the fibers; the length measurement can be applied to all fibers in the cable. This method of length testing provides accurate measurements, and saves time and money. Measuring fiber by the jacket is an accepted method of measurement; however, there are many scenarios where this may not be valid. Length markings may be hard to reach if they are already terminated in a patch panel. Fiber links may also go through multiple cross-connects or have splices in the middle, thereby making jacket markings invalid. Optical measurement of fiber produces accurate results without the need for jacket markings. Optical measurement also saves time by eliminating the need to estimate the length of the fiber run with a measuring wheel. This method is especially troublesome and inaccurate in networks that traverse walls, are in a star topology, or contain riser cables. The VOLT uses a visible laser that can measure fiber links of up to 1.5 kilometers, and is accurate to within ±2.5 meters. In addition to length testing, the VOLT’s high-intensity laser permits it to do double duty as a visual fault locator, and a pulsing mode allows for easy fiber identification. NOTE: To avoid confusion, the VOLT is NOT designed to measure distance to a fault like an OTDR. The VOLT is designed to measure the end-to-end length of a fiber cable. A pair of terminated fibers, looped back at the far end of the cable, are required for end-to-end fiber cable length measurement (see diagram below).
Fiber Length Measurement. The VOLT uses a “round robin” method of length measurement. This method requires two fibers from the same fiber cable to be looped back at one end with a patch cord. Light is injected into one of the fibers by the transmitter and is received by the detector connected to the other fiber. The round trip travel time is converted into length in kilometers and divided by two to arrive at the length of the fiber cable. It is not necessary to test each fiber for length; the length measurement applies to all fibers in the cable.
NOTE: If the green indicator LED does not light up, the battery has insufficient power for a valid test, and must be replaced before continuing.
Visual Fiber Identification. The VOLT provides a flashing mode for easy visual fiber identification. Fibers are identified by locating the fiber end with the flashing red light on the opposite end of the fiber cable. This is useful for locating fibers that are marked incorrectly or not marked at all.
Visual Fault Location. In Continuous Wave Mode, a steady beam of ultra-bright red laser light is injected into the fiber. If this light encounters a break or microbend in the fiber, the light will be redirected into the buffer. This light will be visible through the fiber jacket, informing the user of a break or microbend in the fiber.
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