VFI4 injects high-powered red-laser light to provide exceptional brightness and range for locating defects in single-mode and multimode fibers. The light generated by these units will escape from sharp bends and breaks in jacketed or bare fibers, as well as poorly mated connectors enabling technicians to quickly spot faults. The universal connector interface mates with many connector styles without needing an adapter.
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1 Test & Inspection AFLglobal.com | 800.235.3423 Fiber Identification VFI4 Visual Fault Identifiers ©2021-2022, AFL, all rights reserved. VFI4-00-2000 Revision AB 2022-04-07 Specifications are subject to change without notice . Features • Eye-safe Class 3R visible red laser source, 650 nm (High power version) • Output power of 5.0 mW with 10 km range (High power version) • Universal connector interface for quick connection • 2.5 mm universal adapter (included) accepts FC, SC, ST, etc. connectors • 1.25 mm universal adapter (included in High power version only) accepts LC and MU connectors • Low power model - VFI4-L is available with output power of 1.0 mW with 4 km range Applications • Identify and trace fibers during activation and installation • Identify poorly mated connectors • Verify AFL’s FASTConnect ® field-installable connector installation • Find faults inside OTDR dead zones A Visible Fault Identifier (VFI), also referred to as a Visual Fault Locator (VFL), is an essential tool for fiber installation and maintenance technicians. AFL’s compact VFI4 injects high-powered red-laser light to provide exceptional brightness and range for locating defects in single-mode and multimode fibers. The light generated by these units will escape from sharp bends and breaks in jacketed or bare fibers, as well as poorly mated connectors enabling technicians to quickly spot faults. The universal connector interface mates with many connector styles without needing an adapter. Rugged and Compact: The rugged VFI4 is designed for the rigors of real-life field testing. It has a range of up to 10 km, fits on a keychain, and features extensions that protect the red-laser port. It has both CW and pulsating modes and is powered by a single AA battery for up to 30 hours of operation. Installation and Activation: VFI4 is used for quick continuity checks, fiber tracing, splice verification, and Pass/Fail validation for mechanical connectors. VFI4 is also an excellent complement to any OTDR because it can locate faults inside the OTDR’s dead zone. Essential Troubleshooting Tool: The VFI4 highlights sharp bends, breaks, faulty connectors, and other defects that “leak” light. Other applications include end-to-end continuity checks, as well as identifying connectors in patch panels and fibers during splicing operations. VFI4 High Power Model VFI4-L Low Power Model
2 Test & Inspection AFLglobal.com | 800.235.3423 Fiber Identification VFI4 Visual Fault Identifiers ©2021-2022, AFL, all rights reserved. VFI4-00-2000 Revision AB 2022-04-07 Specifications are subject to change without notice . Specifications a OPTICAL VFI4 VFI4-L Emitter Type Laser, Class IIIa FDA 21 CFR 1040.10 and 1040.11, Class 3R IEC 60825-1:2014 Laser, Class II FDA 21 CFR 1040.10 and 1040.11, Class 2 IEC 60825-1:2014 Wavelength 650 nm ±15 nm Output Power 5 mW maximum 1 mW maximum Modulation 2 Hz or CW selected Ordering Information DESCRIPTION AFL NO. VFI4 visual fault identifier with 2.5 mm and 1.25 mm adapters VFI4-01-0900PR VFI4-L visual fault identifier with 2.5 mm adapter VFI4-02-0900PR Notes : a. All specifications valid at 25°C unless otherwise specified. Adapters DESCRIPTION AFL NO. 2.5 mm Universal for VFI port 2900-50-0013MR 1.25 mm Universal for VFI port 2900-50-0012MR Qualificati ons CATEGORY REGULATION/STANDARD QUALIFICATION CE Marking EU Compliant to relevant EU Directives on health, safety, and environmental protection, and certified with CE marking Safety/EMC/EMI IEC Compliant to IEC 61010-1 for safety requirements for electrical equipment EN Compliant to EN 61010-1 for safety requirements for electrical equipment IEC Compliant to IEC 61326-1 for EMC requirements for electrical equipment EN Compliant to EN 61326-1 for EMC requirements for electrical equipment EN Compliant to EN 55011 for EMC requirements for industrial, scientific and medical equipment FDA Compliant to code of federal regulations FDA 21 CFR 1040.10 and 1040.11 on laser products IEC Compliant to IEC 60825-1 for safety of laser products RoHS EU Compliant to EU regulations Directive 2011/65/EU (RoHS 2) and Directive 2015/863 (RoHS 3) Contact Sales@AFLglobal.com to schedule a demonstration or learn how to buy. Visit www.AFLglobal.com/Test to learn more about VFI4 Visual Fault Identifier. International Sales and Service Contact Information available at www.AFLglobal.com/Test/Contacts . Recommended Products One-Click ® Cleaner Mini • Small compact design with single action cleaning • Automatically advance ensures each clean is performed with fresh cleaning tape • 100 clean and 500 clean versions available • Low cost per clean FASTConnect ® Field-Installable Connectors • Field-installable, takes less than a minute to complete • Fast and easy to terminate • Low insertion/return loss • Reusable GENERAL VFI4 VFI4-L Adapter 2.5 mm Universal, 1.25 mm Universal Power 1 AA battery, <30 hours (flash mode) 1 AA battery, <50 hours (flash mode) Operating Temperature -10°C to 50°C, 85 % humidity non condensing Storage Temperature -30°C to 60°C, 95 % humidity non condensing Size (H x W x D) 7.9 x 5.1 x 2.2 cm (3.1 x 2.0 x 0.9 in) Weight 43 g (1.5 oz)
Features:
- Low power model – VFI4-L is available with output power of 1.0 mW with 4 km range
- Eye-safe Class 3R visible red laser source, 650 nm
- Output power of 5.0 mW with 10 km range
- 2.5 mm universal adapter (included) accepts FC, SC, ST, etc. connectors
- 1.25 mm universal adapter (included) accepts LC and MU connectors
Applications:
- Identify and trace fibers during activation and installation
- Identify poorly mated connectors
- Verify AFL’s FASTConnect® field-installable connector installation
- Find faults inside OTDR dead zones
A Visible Fault Identifier (VFI), also referred to as a Visual Fault Locator (VFL), is an essential tool for fiber installation and maintenance technicians.
AFL’s compact VFI4 injects high-powered red-laser light to provide exceptional brightness and range for locating defects in single-mode and multimode fibers. The light generated by these units will escape from sharp bends and breaks in jacketed or bare fibers, as well as poorly mated connectors enabling technicians to quickly spot faults. The universal connector interface mates with many connector styles without needing an adapter.
Rugged and Compact: The rugged VFI4 is designed for the rigors of real-life field testing. It has a range of up to 10 km, fits on a keychain, and features extensions that protect the red-laser port. It has both CW and pulsating modes and is powered by a single AA battery for up to 30 hours of operation.
Installation and Activation: VFI4 is used for quick continuity checks, fiber tracing, splice verification, and Pass/Fail validation for mechanical connectors. VFI4 is also an excellent complement to any OTDR because it can locate faults inside the OTDR’s dead zone.
Essential Troubleshooting Tool: The VFI4 highlights sharp bends, breaks, faulty connectors, and other defects that “leak” light. Other applications include end-to-end continuity checks, as well as identifying connectors in patch panels and fibers during splicing operations.
Low Power Option: The VFI4-L offers a low power version with a lower output power of 1.0 mW and a 4 km range.

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