
F4-Series Compact OTDR
Highlights

- An 8-inch high-definition touchscreen and buttons make it easy to use
- 35/33 dB dynamic range
- A minimum test blind zone of 0.8m
- The optional online test module enables lossless link light test
- Single-mode, multi-mode, and integrated OTDR all available
- OPM, VFL
- Fault location
- Optical loss test
- Optical eye (MAP view)
- Bluetooth
TFN offers a high-performance multi-function OTDR for fast and accurate optical fiber testing. F4 OTDR also features Ethernet test, remote test, and OTDR test.



Specifications
| 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 | 500m /1km /2km /4km /8km /16km /32km /64km /128km /256km | |||||||
| Pulse Width | 5ns/10ns/50ns/160ns/320ns/500ns/1000ns/5000ns/10000ns/ 20000ns | |||||||
| Distance Accuracy | ±(0.75m+ sampling interval + 0.005%*test distance) | |||||||
| Optical Connector | FC/PC (interchangeable SC, ST) | |||||||
| OPM | -50dB ~+26dB | |||||||
| Battery | 15600mAh. Standby time over 10 hours | |||||||
| Weight | 1.1 KG | |||||||
Please note: 1. The F4-V1, F4-V2, and F4-SMV are a custom edition. 2. The F4 is not equipped with a fiber microscope.
Product Demo
Use cases
Acceptance testing of fiber optic communication systems.
Development and production of fiber optic cables
Construction testing and repair of the communication system.





OTDR
The OTDR features flexible setup options, including launch and end fiber configurations. It supports customizable PASS/FAIL thresholds, visually distinguishes event qualifications, generates detailed PDF reports, and allows comparison of multiple SOR curves with advanced analysis methods like the four-point and LSA methods.
Real Experiences with the TFN OTDR
Eric H.
“Very easy to use. I’ve been a loyal customer of TFN for years. The technical support is nice, and the products are always reliable. it makes troubleshooting much quicker. Great value for the price.”
Scott N.
“I recently purchased an otdr tester, and I couldn’t be excited with my purchase. Compact and fast, it has become our go-to tool for fiber optic testing. The results are very accurate”
FAQs
Which languages does F4 OTDR support?
Our OTDR support English for standard version, and the optional version supports Russian, Spanish, and Arabic.
What’s the lead time?
For our standard products, if there are in stock and ready for shipment, the lead time is about 7-10 days. For our optional products, the lead time is about 25-30 days.
Do you support online training?
We support online demos, and you can also watch tutorials of F7 OTDR tester on YouTube (the same applies to F4).