Applies to
FTB-1V2, FTB-2, FTB-4 and MaxTester series PM-VFL modules
Problem
You may sometimes experience issues with the performance of the Visual Fault Locator (VFL) on PM-VFL modules installed in EXFO platforms and handheld units where the transmitted light may seem understrength.
This article provides guidance on troubleshooting issues that may arise when using a VFL.
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IMPORTANT NOTE If comparing the performance of EXFO VFLs with that of other manufacturers, note that different units may not be directly comparable. EXFO VFLs comply with IEC 60825-1:2014 whilst other units may indeed use a more powerful laser source but therefore be uncompliant with modern laser safety standards. |
Troubleshooting steps
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IMPORTANT NOTE When following the guidance below, before performing any inspection of fibers or ports, you should first ensure that any connected sources are deactivated or disconnected as appropriate. |
Possible Cause 1: Fiber Under Test (FUT) is dirty or damaged.
Proposed Solution
• Carefully inspect the ferrule of the fiber connected to the VFL port for dirt or damage.
• If appropriate, attempt to clean the ferrule of the fiber.
• Check using a test cord or FUT of known length and quality.
Possible Cause 2: Connection issue between FUT and VFL port.
Proposed Solution
• Remove and reconnect the connected fiber, ensuring it is fully inserted.
• If the fiber connected to the VFL port is not UPC-terminated, connect the FUT to the VFL port using an appropriate UPC-terminated hybrid patch cord or otherwise.
Possible Cause 3: VFL port dirty or damaged.
Proposed Solution
• Visually examine the ceramic inside of the VFL connector ferrule for any signs of damage or debris.
• Carefully inspect the internal surface of the VFL source.
• If appropriate, attempt to clean the internal surface of the VFL source using a mechanical cleaner or other suitable cleaning device/s.
• Consider requesting an RMA for repair of the PM-VFL module.
Possible Cause 4: Module fault.
Proposed Solution
• Reinstall the PM-VFL module; consult the relevant section of the appropriate User Manual for the hosting platform or handheld unit.
• If possible, install PM-VFL module in a different platform or handheld unit to validate.
• Consider requesting an RMA for repair of the PM-VFL module.