1. Introduction
The NOYAFA NF-909 is an all-in-one optical multimeter designed for optical attenuation measurement. It functions as both an optical power meter and a stable light source, offering versatile capabilities for fiber optic testing. This device is equipped with features such as dual wavelength output, multiple modulation frequencies, automatic wavelength recognition, and an intuitive LCD display.
Figure 1: NOYAFA NF-909 Optical Power Meter & Light Source
2. Setup
2.1 Package Contents
Before using the device, please ensure all items are present:
- NOYAFA NF-909 Optical Power Meter & Light Source
- Carrying Pouch
- Instruction Manual (this document)
- Batteries (3x 1.5V, typically AAA type, included)
Figure 2: Product packaging and included accessories
2.2 Battery Installation
The device requires three 1.5V batteries. Locate the battery compartment on the back of the device, open it, insert the batteries according to the polarity markings, and close the compartment securely.
2.3 Connecting Fiber Optic Cables
The NF-909 features fiber ports for connecting optical cables. Ensure the dust covers are removed before connection and replaced after use to protect the ports.
Figure 3: Fiber ports with dust cover removed. All fiber connectors are compatible.
3. Operating Instructions
3.1 Device Overview
Figure 4: NOYAFA NF-909 Product Details and Button Layout
- Dust Cover: Protects fiber ports when not in use.
- Fiber Port: Connects to optical fiber cables.
- LCD Screen: Displays measurements, wavelengths, and settings.
- Charging Port: For recharging the device (if using rechargeable batteries).
- OP/SL (Function Switch/Calibration): Toggles between power meter and light source functions, and initiates calibration.
- Lambda (Wavelength): Cycles through available wavelengths for the power meter.
- dBm/W (Power Range Switch): Switches between linear (W) and logarithmic (dBm) power display.
- REF (Reference): Sets the current power reading as a reference value.
- Power Switch: Turns the device ON/OFF.
- Light Source & Hybrid Key: Activates the light source function and may have other hybrid functions depending on the mode.
3.2 Powering On/Off
Press and hold the Power Switch button to turn the device ON or OFF.
3.3 Optical Power Meter Function
- Turn on the device.
- Ensure the device is in power meter mode (indicated on the LCD). If not, press OP/SL to switch.
- Connect the fiber optic cable to the fiber port.
- The power meter can automatically recognize and switch to the measured wavelength.
- Press Lambda to manually cycle through the available wavelengths (850/1300/1310/1490/1550/1625nm) if needed.
- Press dBm/W to switch between linear (W) and logarithmic (dBm) display of optical power.
- To set a reference value, press REF. The display will show the current reading as 0dB, and subsequent measurements will be relative to this reference.
Figure 5: Power meter display showing wavelength and power reading. The power meter supports 6 wavelengths.
3.4 Light Source Function
- Turn on the device.
- Press OP/SL to switch to light source mode.
- Press the Light Source & Hybrid Key to activate the light source.
- The light source provides dual wavelength output at 1310nm and 1550nm.
- It supports continuous wave (CW) output and modulated wave outputs at 270Hz, 1kHz, and 2kHz.
- The light source can send wavelength identification codes, which the power meter can automatically detect.
3.5 Automatic Features
- Automatic Wavelength Detection: The power meter automatically detects the wavelength being measured when connected to a compatible light source.
- Automatic Range Conversion: The optical power display automatically adjusts its range for optimal readability.
- LCD Backlight: The LCD screen features a backlight for visibility in various lighting conditions.
- Automatic Shutdown: The device will automatically shut down after 60 minutes of no operation to conserve battery life. This feature can typically be shielded or disabled through specific key combinations (refer to the full manual for details).
- Charging Shutdown: The device automatically shuts off charging once the batteries are fully charged.
Figure 6: Key features including steady power meter wavelength output, stable modulation frequency, auto-detect, and auto-power off.
4. Maintenance
4.1 Cleaning
- Device Exterior: Wipe the device with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Fiber Ports: Keep the fiber ports clean. Use specialized fiber optic cleaning tools (e.g., lint-free wipes and isopropyl alcohol) to clean the ports if contamination is suspected. Always replace dust covers when ports are not in use.
4.2 Battery Care
- If using non-rechargeable batteries, replace them when the low voltage indicator appears.
- If using rechargeable batteries, ensure they are charged regularly. The device has an automatic charging shutdown feature to prevent overcharging.
- Remove batteries if the device will not be used for an extended period to prevent leakage.
4.3 Storage
Store the device in its protective carrying pouch in a cool, dry place away from direct sunlight and extreme temperatures. Ensure dust covers are on the fiber ports.
5. Troubleshooting
5.1 No Display/Device Not Turning On
- Check battery installation and ensure correct polarity.
- Replace batteries with fresh ones.
- Ensure the power button is pressed and held sufficiently.
5.2 Inaccurate Power Readings
- Ensure fiber ports and connectors are clean. Contamination can significantly affect readings.
- Verify that the correct wavelength is selected or automatically detected for the measurement.
- Perform a calibration if necessary (refer to the full manual for calibration procedures).
- Check if the fiber cable itself is damaged.
5.3 Light Source Not Emitting
- Ensure the device is in light source mode.
- Check battery level.
- Verify that the Light Source & Hybrid Key is pressed to activate the output.
5.4 Automatic Shutdown Occurs Too Soon
The device has a 60-minute auto-shutdown feature. If it's shutting down unexpectedly before this period, check battery levels. If the issue persists, consult the full product manual for options to adjust or disable the auto-shutdown feature.
6. Specifications
| Parameter | Value |
|---|---|
| Product Name | NF-909 Optical Power Meter & Light Source |
| Power Detecting Range (dBm) | -70 ~ +10 |
| Detection Wavelength Range | 800-1700nm |
| Probe Type | InGaAs |
| Detection Limit | ≤1.0mm |
| Standard Wavelengths (Power Meter) | 850/1300/1310/1490/1550/1625nm |
| Display Resolution | 0.01dBm |
| Modulation Frequencies | CW/270Hz, 1Hz, 2Hz |
| Standard Wavelengths (Light Source) | 1310/1550nm |
| Emitter Type | FP-LD |
| Working Temperature | -20 ~ +70°C |
| Power Supply | 3 x 1.5V batteries |
| Overall Dimension | 160 x 75 x 32mm |
| Battery Included | Yes |
| Certification | CE |
| Origin | Mainland China |
Figure 7: Detailed Product Information Table
7. User Tips
- Keep Ports Clean: Always ensure the fiber optic ports and connectors are free from dust and debris. Even small particles can cause significant measurement errors. Use appropriate cleaning tools.
- Battery Management: For optimal performance and longevity, use high-quality batteries. If using rechargeable batteries, ensure they are fully charged before critical measurements.
- Reference Setting: Utilize the REF function to establish a baseline measurement for relative power loss calculations, which is crucial for link budget analysis.
8. Warranty and Support
For warranty information, technical support, or service inquiries, please contact your original point of purchase or the manufacturer directly. Keep your purchase receipt as proof of purchase.
