1. Introduction
The EFUZCOCI GD151A Digital Sound Level Meter is designed for measuring environmental sound levels. This device is suitable for various applications including workshops, schools, residences, offices, traffic areas, and audio environments. It is also useful for noise engineering, product quality control, and health prevention. In addition to sound level measurement, the GD151A can measure ambient temperature and humidity.
2. Product Features
- Sound Level Measurement: Measures sound levels in dBA.
- Temperature Measurement: Displays ambient temperature in °C or °F.
- Humidity Measurement: Displays ambient relative humidity in %RH.
- Fast/Slow Time Weighting: Selectable response times for various sound measurement requirements.
- A-Weighting: Specifically designed for measuring ambient noise, mimicking human ear response.
- 2.4-inch Backlight Display: Clear and easy-to-read display.
- Auto Power Off: Automatically shuts down after 10 minutes of inactivity to conserve battery.
- Data Hold Function: Freezes the current measurement on the display.
- Max/Min Function: Records and displays the maximum and minimum measured values.
- Low Battery Indication: Alerts when battery power is low.
- Condenser Microphone: Built-in high-performance sensor with a windproof sponge to reduce interference.
3. Package Contents
Please check the package contents upon receipt. If any items are missing or damaged, contact your retailer.
- 1 x EFUZCOCI GD151A Digital Sound Level Meter
- 1 x User Manual
- 1 x Storage Bag
- 1 x Product Box
4. Product Overview
Familiarize yourself with the components of your GD151A Sound Level Meter.
Figure 4.1: Front view of the GD151A Digital Sound Level Meter, showing the display, control buttons, and microphone with protective cap.
Figure 4.2: Detail of the condenser microphone, equipped with a windproof sponge ball for accurate readings.
Figure 4.3: The GD151A in operation, illustrating the display of humidity, temperature, and decibel values.
5. Setup
5.1 Battery Installation
- Locate the battery compartment cover on the back of the device.
- Slide or unclip the cover to open the compartment.
- Insert three (3) AAA batteries, ensuring correct polarity (+ and -). Batteries are not included.
- Replace the battery compartment cover securely.
5.2 Powering On/Off
- To power on the device, press the Power button (⏻) located on the front panel.
- To power off the device, press and hold the Power button until the display turns off.
- The device features an automatic power-off function after 10 minutes of inactivity to save battery life.
6. Operation
6.1 Basic Sound Level Measurement
- Ensure batteries are installed and power on the device.
- Hold the meter with the microphone pointed towards the sound source.
- The current sound level in dBA will be displayed on the screen. Ambient temperature and humidity will also be shown.
6.2 Fast/Slow Time Weighting
The GD151A offers two time weighting modes to suit different measurement needs:
- Press the F/S button to toggle between FAST (125ms response time) and SLOW (1 second response time).
- FAST: Suitable for measuring rapidly changing noise levels, such as impulsive sounds.
- SLOW: Ideal for measuring stable or slowly changing noise levels, providing an average reading.
6.3 A-Weighting
The GD151A model exclusively uses A-weighting. This weighting curve is designed to approximate the human ear's response to sound, making it suitable for general environmental noise measurements.
Figure 6.1: The GD151A display indicating A-Weighting for sound level measurement.
Figure 6.2: Illustrates the GD151A's A-weighting for ambient noise measurement, in contrast to the GD151B's A/C weighting capability.
6.4 Temperature Unit Selection
- Press the °C/°F button to switch the temperature display between Celsius (°C) and Fahrenheit (°F).
6.5 Data Hold Function
- Press the H/* button to activate the Data Hold function. The current reading will be frozen on the display.
- Press the H/* button again to release the Data Hold and resume live measurements.
6.6 Max/Min Function
- Press the MAX MIN button once to display the maximum measured value since the function was activated.
- Press the MAX MIN button again to display the minimum measured value.
- Press the MAX MIN button a third time to exit the Max/Min mode and return to live measurement.
7. Maintenance
7.1 Cleaning
- Wipe the device with a soft, dry cloth.
- Do not use abrasive cleaners or solvents, as they may damage the casing or display.
- Keep the microphone free from dust and debris. The windproof sponge can be gently cleaned or replaced if necessary.
7.2 Battery Replacement
- When the low battery indicator appears on the display, replace all three AAA batteries promptly.
- Refer to Section 5.1 for battery installation instructions.
- Dispose of used batteries according to local regulations.
7.3 Storage
- When not in use for extended periods, remove the batteries to prevent leakage.
- Store the device in a cool, dry place, away from direct sunlight and extreme temperatures.
- Use the provided storage bag to protect the meter from dust and physical damage.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on. | Low or depleted batteries; incorrect battery installation. | Replace batteries with new ones, ensuring correct polarity. |
| Inaccurate sound level readings. | Microphone obstructed; strong wind interference; device not calibrated. | Ensure microphone is clear. Use windproof sponge. For calibration, contact support. |
| Display is blank or flickering. | Low battery power; device malfunction. | Replace batteries. If problem persists, contact customer support. |
9. Specifications
| Parameter | Value |
|---|---|
| Sound Level Range | 30-130 dBA |
| Frequency Range | 30 Hz - 8 KHz |
| Dynamic Range | 50 dB |
| Frequency Weighting | A Weighting |
| Time Weighting | Fast (125ms), Slow (1 sec) |
| Temperature Range | -20°C to 60°C (-4°F to 140°F) |
| Temperature Accuracy | 0°C-45°C (32°F-113°F): ±1°C/2°F; Other: ±1.5°C/3°F |
| Humidity Range | 0.0% - 99.9% RH |
| Humidity Accuracy | 20%-80% RH: ±5% RH; Other: ±6% RH |
| Auto Power Off | 10 minutes |
| Power Supply | 3 x AAA batteries (not included) |
| Item Dimensions | 142 x 58 x 26 mm |
| Item Weight | Approximately 114 g |
10. Safety Information
- Do not attempt to disassemble or modify the device. This may cause damage and void the warranty.
- Keep the device away from water, high humidity, and extreme temperatures.
- Avoid dropping the device or subjecting it to strong impacts.
- Do not expose the microphone to excessive force or sharp objects.
- Ensure batteries are inserted correctly to prevent damage from reverse polarity.
- Remove batteries if the device will not be used for an extended period.
11. Warranty and Support
This product comes with a standard manufacturer's warranty. For specific warranty terms and conditions, please refer to the documentation provided with your purchase or contact the retailer.
For technical support, troubleshooting assistance, or inquiries regarding your EFUZCOCI GD151A Digital Sound Level Meter, please contact EFUZCOCI customer service or your authorized dealer.
Manufacturer: EFUZCOCI