1. Introduction
This manual provides detailed instructions for the safe and effective operation of the FNIRSI FDM-02 Digital Noise Meter. The FDM-02 is a high-precision handheld instrument designed for measuring sound levels in various environments. It features a 2.0-inch color display, A/C weighting characteristics, fast and slow time weighting, and a measurement range of 30dB to 130dB. Please read this manual thoroughly before using the device.
2. Safety Information
- Do not expose the device to extreme temperatures, humidity, or direct sunlight.
- Avoid strong vibrations or impacts to prevent damage.
- Do not attempt to disassemble or modify the device. Refer all servicing to qualified personnel.
- Keep the device away from water and other liquids.
- Use only the provided charging cable or a compatible charger.
- Ensure the microphone is clean and free from obstructions for accurate readings.
3. Package Contents
Verify that all items are present in the package:
- 1x FNIRSI FDM-02 Digital Noise Meter
- 1x Charging Cable (USB data cable)
- 1x Storage Bag
Image: FNIRSI FDM-02 Digital Noise Meter with its USB charging cable and storage bag, illustrating the complete package contents.
4. Product Overview
The FNIRSI FDM-02 is a compact and robust digital noise meter. Its design incorporates a condenser microphone for accurate sound capture and a 2.0-inch TFT color screen for clear data display.
Image: The FNIRSI FDM-02 Digital Noise Meter, highlighting its ergonomic design and primary display interface.
Key Features:
- 2.0-inch TFT Color Screen: Provides clear and detailed measurement data.
- Capacitive Microphone: Ensures high-precision sound level detection.
- A/C Weighting: Allows for measurement in diverse environments (environmental noise vs. mechanical noise).
- Fast/Slow Time Weighting: Offers flexible response times for stable or rapidly changing noise levels.
- Curve Recording: Visualizes noise changes over time.
- Temperature and Humidity Sensor: Integrated for additional environmental data.
Image: Overview of the FNIRSI FDM-02's professional features, including A/C weighting and curve recording capabilities.
Image: The multi-functional display of the FDM-02, showing simultaneous readings for noise, temperature, and humidity.
5. Setup
5.1 Charging the Device
The FDM-02 is powered by a built-in 1500mAh/3.7V lithium battery. Before first use, fully charge the device.
- Connect the provided USB charging cable to the charging port on the device.
- Connect the other end of the USB cable to a standard USB power adapter (not included) or a computer's USB port.
- The charging indicator on the device will show the charging status. Once fully charged, disconnect the cable.
5.2 Powering On/Off
- To Power On: Press and hold the power button (usually located on the side or front panel) until the display illuminates.
- To Power Off: Press and hold the power button again until the display turns off. The device also supports adjustable auto-shutdown settings.
6. Operating Instructions
6.1 Basic Measurement
Once powered on, the device will typically enter real-time measurement mode, displaying the current sound level in decibels (dB).
- Hold the meter in the desired measurement location, ensuring the microphone is pointed towards the sound source.
- Read the decibel value displayed on the screen.
6.2 A/C Weighting Selection
The FDM-02 supports both A and C frequency weighting characteristics, allowing for measurements tailored to different types of noise.
- A-Weighting: Simulates the human ear's response to sound, commonly used for environmental noise assessment.
- C-Weighting: Provides a flatter response, suitable for measuring mechanical noise or peak sound levels.
- To switch between A and C weighting, press the designated "A/C" button on the device. The current weighting will be indicated on the display.
Image: Illustration of A-weighting for environmental noise (e.g., baby sleeping) and C-weighting for mechanical noise (e.g., machinery) applications.
6.3 Fast/Slow Time Weighting
The device offers two time weighting characteristics to capture different noise dynamics:
- FAST (125 milliseconds): Provides a quicker response to rapidly changing noise levels, useful for capturing transient sounds.
- SLOW (1 second): Offers a more stable reading for steady noise levels, averaging out fluctuations.
- To switch between FAST and SLOW, press the "FAST/SLOW" button. The selected mode will be displayed.
Image: The FDM-02 display demonstrating the difference between FAST and SLOW time weighting for noise measurement, showing how FAST responds quicker to changes.
6.4 Curve Recording
The curve recording feature allows for visualization of noise level changes over a period of time.
- Navigate to the curve interface using the device's menu buttons.
- The screen will display a graph showing the noise level fluctuations, updated every 0.5 seconds.
- This mode is useful for monitoring noise trends and identifying patterns.
Image: The FDM-02 in curve recording mode, displaying a graphical representation of noise level variations over a specific duration.
6.5 Settings Menu
Access the settings menu to customize various device parameters:
- Brightness Setting: Adjustable from 5% to 100% in 5% steps.
- Language Switching: Supports Chinese and English.
- Style Mode: Dual style switching (Day/Night mode).
- Date Clock: Set year, month, day, and time.
- Sleep Setting: Adjustable sleep brightness and sleep time.
- Auto Shutdown: Adjustable auto shutdown time from 1 to 60 minutes.
- Alarm Record: Records up to 30 items, including high and low threshold times and types.
- Threshold Setting: Minimum 0.0dB, maximum 130.0dB.
7. Maintenance
- Cleaning: Use a soft, dry cloth to clean the device. Do not use abrasive cleaners or solvents. Ensure the microphone is free of dust and debris.
- Storage: When not in use, store the device in the provided storage bag in a cool, dry place, away from direct sunlight and extreme temperatures.
- Battery Care: For optimal battery life, avoid fully discharging the battery frequently. If storing for extended periods, charge the battery to approximately 50% every few months.
8. Troubleshooting
If you encounter issues with your FNIRSI FDM-02, consider the following common solutions:
- Device does not power on: Ensure the battery is sufficiently charged. Connect the device to a charger and try again.
- Inaccurate readings: Check if the microphone is obstructed or dirty. Ensure the device is held steadily and pointed correctly. Verify the selected A/C weighting and Fast/Slow time weighting are appropriate for your measurement.
- Display issues: Adjust the brightness setting in the menu. If the screen remains unresponsive or displays errors, try restarting the device.
- Device freezes: Press and hold the power button to force a shutdown, then restart the device.
If problems persist, contact customer support for further assistance.
9. Specifications
| Parameter | Value |
|---|---|
| Screen | 2.0-inch TFT color screen |
| Display | 4 digits, resolution 0.1dB |
| Frequency Weighting Characteristics | A and C |
| Time Weighting Characteristics | Fast (FAST) 125 milliseconds; Slow (SLOW) 1 second |
| Frequency Response | 31.5Hz-8.5KHz |
| Dynamic Scale Display/Value Update | Fast 0.5 times/second; Slow 1 time/second |
| Dynamic Range | 3.50dB |
| Accuracy | ±1.5dB (based on standard sound source, 94dB@1KHz) |
| Measurement Range | 30dB~130dB |
| Alarm Record | 30 items, record high and low threshold time and type |
| Brightness Setting | 5%-100% adjustable, step 5% |
| Curve Interface Update | Once every 0.5 seconds |
| Overload Indication | High report, low report |
| Threshold Setting Range | Minimum 0.0dB, Maximum 130.0dB |
| Language Switching | Supports Chinese/English |
| Style Mode | Dual style switching (Day/Night) |
| Date Clock | Year, month, day and time |
| Sleep Setting | Sleep brightness adjustable, sleep time adjustable |
| Auto Shutdown | Adjustable 1-60 minutes |
| Battery | 1500mAh/3.7V lithium battery |
10. Warranty and Support
The FNIRSI FDM-02 Digital Noise Meter is manufactured by OUGETHER. For warranty information, technical support, or service inquiries, please refer to the contact information provided with your purchase or visit the official OUGETHER website. Please retain your proof of purchase for warranty claims.