The TFN F4 Optical Time Domain Reflectometer (OTDR) is a versatile and professional fiber optic testing instrument designed for installation, maintenance, and troubleshooting of fiber networks. It integrates multiple testing functions including OTDR, optical power meter (OPM), visual fault locator (VFL) and Ethernet testing into one compact device. The F4 ensures reliable, efficient, and accurate fiber testing in various environments.
Product Features
✅ High Dynamic Range & Low Blind Zone
The F4 offers a dynamic range of up to 45 dB (optional) with a blind zone as low as 1 meter, enabling precise detection of events and faults even in long-distance or complex fiber networks. This makes it ideal for troubleshooting and quality assurance in telecom and enterprise networks.
✅ All-in-One Fiber Testing Tool
Combining OTDR, OPM, VFL and optical loss testing in one device, also have some optional functions such as laser source, fiber microscope, the F4 eliminates the need for multiple instruments. It supports dual-wavelength testing, real-time power measurement, and visual fault location, streamlining fieldwork and reducing equipment costs.
✅ Customizable for B2B & OEM Partners
The F4 supports OEM and ODM services, allowing customization of language interfaces, wavelength options, dynamic ranges, and branding. This flexibility makes it an excellent choice for distributors, resellers, and system integrators looking to offer tailored testing solutions.
✅ Smart Diagnostics & Report Generation
With built-in Pass/Fail analysis and automatic event mapping, the F4 ensures reliable and valid test results. Users can export test data in SOR and PDF formats, generating professional reports for compliance, documentation, and client delivery.
✅ Cost-Effective Professional Testing
Designed for both performance and affordability, the F4 delivers enterprise-grade testing capabilities at a competitive price. Its long battery life, intuitive interface, and durable build make it a smart investment for teams requiring reliable field testing without exceeding budget.
Spec Sheet
| Model / Item | F4 | F4-V1 | F4-V2 | F4-SMV |
| Wavelength (nm) | 1310/1550 | 1310/1550 | 1310/1550 | 850/1300/1310/1550 |
| Dynamic Range (dB) | 35/33 | 42/40 | 45/43 | 26/30/37/35 |
| Event Dead Zone (m) | 1 | 0.8 | 0.8 | 1 |
| Attenuation Dead Zone (m) | 6 | 6 | 6 | 6 |
| Test Range | 500 m /1 km /2 km /4 km /8 km /16 km /32 km /64 km /128 km /256 km | |||
| Pulse Width (ns) | 5/10/50/160/320/500/1000/5000/10000/ 20000 | |||
| Distance Accuracy | ±(0.75 m+ sampling interval + 0.005%*test distance) | |||
| Optical Connector | FC/PC （interchangeable SC, ST） | |||
| OPM | -50 dB ~+26 dB | |||
| Battery | 15600 mAh. Standby time over 10 hours | |||
| Weight | 1.1 kg | |||
Where It's Used
- FTTH/ PON Network Installation & Commissioning.
- Data Center & Enterprise Cabling Certification.
- Long-Haul & Telecom Link Maintenance & Troubleshooting.
- Fiber Manufacturing & Cable Production Quality Control.
- Network Contractor & System Integrator Field Operations.
Package Content
- F4 OTDR Main Unit × 1
- Charger & Power Adapter × 1
- Type-C Data Cable × 1
- FC/PC Test Jumper × 1
- Protective Carrying Case × 1
- USB Flash Drive (Including User manual and analysis softwares) × 1