1. Introduction
The Noyafa NF-919 is a versatile 3-in-1 fiber optic tester designed for comprehensive optical fiber network analysis. It integrates an optical power meter, a stable light source, and a visual fault locator (VFL) into a single, compact device. This manual provides detailed instructions for the safe and effective use of your NF-919 tester, covering its features, operation, maintenance, and troubleshooting.
2. Safety Information
Please read and understand all safety instructions before operating the device. Failure to follow these instructions may result in injury or damage to the device.
- Laser Safety: Do not look directly into the optical output ports when the device is active, especially when using the VFL function. Laser radiation can cause serious eye damage.
- Battery Safety: Use only the specified charging cable and power source. Do not expose the device to extreme temperatures or attempt to disassemble the battery.
- Environmental Conditions: Operate the device within the specified working temperature range (-20°C to 50°C). Avoid exposure to moisture, dust, and corrosive environments.
- Handling: The device features ABS engineering plastic and silicone edge protection to absorb impacts, but handle with care to prevent damage.
3. Package Contents
Verify that all items are present in your package:
- Main Tester (NF-919)
- USB Type-C Cable
- Quality Certificate
- Lithium Battery Precautions Card
- Carry Bag
- User Manual
- Color Box
4. Product Overview
The NF-919 is a compact and portable device featuring a color LCD for clear data display and easy operation. It is designed for one-hand operation and includes robust protection features.
4.1 Device Layout
- OPM Port: For optical power measurement.
- Light Source Port: For stable light source output.
- VFL Port: For visual fault locator output.
- LCD Display: Color screen for displaying measurements and settings.
- REF Button: Used for setting reference values in OPM mode.
- On/Off Button: Powers the device on or off.
- Unit Setting Button: Changes measurement units (dBm, W, etc.).
- Red Light/Wavelength Button: Toggles VFL function and changes wavelengths in OPM/SL modes.
- Frequency Button: Adjusts output frequency in SL and VFL modes.
- USB Type-C Charging Port: Located on the side for charging the internal battery.
4.2 Key Features
- 3-in-1 Functionality: Optical Power Meter, Stable Light Source, and Visual Fault Locator.
- Wide Wavelength Range: Supports 6 standard wavelengths for OPM (850/980/1310/1490/1550/1625nm) and additional wavelengths for comprehensive testing.
- High-Definition Color Screen: Provides clear and easy-to-read data.
- Universal Interface: Compatible with FC, SC, and ST fiber optic connectors.
- Rechargeable Battery: Built-in 1500mAh lithium battery with Type-C charging and intelligent protection.
- Intelligent Standby: Automatic shutdown after 30 minutes of inactivity (can be enabled/disabled).
- Durable Design: ABS engineering plastic with silicone edge protection for enhanced durability.
5. Setup
5.1 Charging the Device
The NF-919 comes with a built-in 1500mAh lithium battery. Before first use, or when the low battery indicator appears, charge the device using the provided USB Type-C cable.
- Connect the USB Type-C cable to the charging port on the side of the device.
- Connect the other end of the cable to a standard USB power adapter (not included).
- The battery indicator on the screen will show charging status.
The device features intelligent protection against overcharge, overcurrent, overvoltage, and short circuits.
5.2 Interface Protection
The optical ports (OPM, SL, VFL) are equipped with protection caps. Always ensure these caps are in place when the ports are not in use to protect the metal tips and extend their lifespan.
5.3 Connecting Fiber Optic Cables
The NF-919 supports universal 2.5mm interfaces for FC, SC, and ST fiber optic connectors. Ensure the correct adapter is used and the fiber end-face is clean before connecting.
6. Operating Instructions
6.1 Power On/Off
Press and hold the On/Off button to power the device on or off.
6.2 Light Source Function (SL)
The Light Source function provides stable optical power output for testing fiber optic links.
- Press the Red Light/Wavelength button to cycle through available wavelengths (1310nm, 1550nm). The selected wavelength will be displayed on the screen.
- Press the Frequency button to switch between output frequencies (00Hz (continuous), 270Hz, 1000Hz, 2000Hz).
- Connect the fiber optic cable to the Light Source port (SL).
Video 1: Demonstration of Light Source, OPM, and VFL functions.
6.3 Optical Power Test Function (OP)
The Optical Power Meter measures the optical power and attenuation value of fiber optic signals.
- Connect the fiber optic cable to the OPM port.
- Press the Red Light/Wavelength button to cycle through the supported wavelengths (850/980/1270/1300/1310/1490/1550/1577/1625/1650nm). Select the appropriate wavelength for your test.
- Press the Unit Setting button to switch between measurement units (dBm, mW, uW, nW).
- The measured optical power will be displayed on the screen.
- Setting Reference (REF): To measure optical attenuation (loss), first establish a reference power. Connect the fiber directly to the OPM port (or through a known good patch cable) and ensure a stable light source is connected to the other end. Press the REF button to set the current power as the reference (0.00 dB). Then, insert the fiber segment or component to be tested, and the display will show the attenuation relative to the reference.
6.4 Red Light Function (RL) / Visual Fault Locator (VFL)
The VFL function emits a visible red laser (650nm) to quickly locate breaks, bends, and poor connections in fiber optic cables.
- Connect the fiber optic cable to the VFL port.
- Press the Red Light/Wavelength button to activate the red light function.
- Press the Frequency button to switch between continuous (00Hz) and flashing (01Hz) modes.
- Observe the fiber for any visible red light leakage, which indicates a fault.
7. Specifications
| Feature | Specification |
|---|---|
| Model Number | NF-919 |
| Display | Color LCD |
| Light Source Function Wavelengths | 1310nm, 1550nm |
| Light Source Function Frequencies | 00Hz (Continuous), 270Hz, 1000Hz, 2000Hz |
| OPM Test Function Wavelengths | 850nm, 980nm, 1270nm, 1300nm, 1310nm, 1490nm, 1550nm, 1577nm, 1625nm, 1650nm |
| OPM Test Function Units | dBm, W, uW, nW |
| REF Function | Yes (for relative power/loss testing) |
| Red Light Function Wavelength | 650nm |
| Red Light Function Frequencies | 00Hz (Steady-on), 01Hz (Flashing) |
| Auto-off | 30 minutes of inactivity (can be set on/off) |
| Low Battery Indication | Yes (alerts when battery falls below 19%) |
| Working Temperature | -20°C ~ 50°C |
| Power Supply | 3.7V 1500mA Lithium Battery |
| Product Dimensions | 139mm x 84mm x 29mm |
8. Maintenance
- Cleaning: Use a soft, dry cloth to clean the device's exterior. For optical ports, use specialized fiber optic cleaning tools and solutions to ensure accurate measurements.
- Storage: Store the device in its carry bag in a cool, dry place away from direct sunlight and extreme temperatures. Ensure all port protection caps are in place.
- Battery Care: Recharge the battery regularly, even if the device is not in frequent use, to maintain battery health. Avoid fully discharging the battery for extended periods.
9. Troubleshooting
- Device does not power on: Ensure the battery is charged. If the issue persists, contact support.
- Inaccurate OPM readings: Clean the fiber optic connectors and the OPM port. Ensure the correct wavelength is selected for the measurement. Verify the light source is stable.
- VFL not emitting light: Check if the VFL function is activated and the frequency is set. Ensure the fiber is properly connected.
- Screen is blank or frozen: Try restarting the device. If the problem continues, the device may require service.
10. User Tips
- Connector Compatibility: The NF-919 supports universal 2.5mm interfaces for FC, SC, and ST connectors. When connecting, ensure you are using the correct connector type for the port. For example, if your fiber uses an SC/APC connector, you will need an SC/APC to SC/UPC adapter if the device port is SC/UPC, or ensure direct compatibility.
- Regular Cleaning: Dust and debris are the primary causes of inaccurate readings and damage to optical ports. Always clean connectors and ports before use.
- Reference Setting for Loss: When measuring optical loss, always set a reference power with a known good connection before introducing the component or cable segment you wish to test. This ensures accurate attenuation measurements.
11. Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the contact information provided with your purchase or visit the official NOYAFA website. Keep your purchase receipt as proof of purchase for warranty claims.
