1. Product Overview
The GVDA ST9604 is a portable digital sound level meter designed for measuring noise levels in various environments. It features a wide measurement range, A-weighting, and a color LCD display for clear readings. This device is suitable for applications such as construction noise monitoring, sound insulation material testing, and general environmental noise assessment.
2. Setup
2.1 Battery Installation
- Locate the battery compartment cover on the back of the device.
- Slide the cover open.
- Insert 3 AAA batteries (not included) into the compartment, ensuring correct polarity (+/-).
- Close the battery compartment cover securely.
2.2 Initial Power On
Press the red power button (⑆) located on the front panel to turn on the device. The color LCD display will illuminate, showing current sound level and temperature readings.
3. Operating Instructions
3.1 Basic Measurement
Once powered on, the meter will immediately begin measuring sound levels. The primary sound level (in dBA) and ambient temperature (in °C or °F) will be displayed on the large color LCD screen.
3.2 Mode Selection (MODE Button)
Press the 'MODE' button to cycle through different measurement modes, such as normal measurement, maximum value hold, and minimum value hold. The active mode will be indicated on the display.
3.3 Data Hold (SET Button)
Press the 'SET' button to activate the Data Hold function. This will freeze the current measurement on the display, allowing you to record the value. Press 'SET' again to release the hold and resume live measurement.
3.4 Unit Conversion (UNIT Button)
Press the 'UNIT' button to switch between Celsius (°C) and Fahrenheit (°F) for temperature display. This button may also control other unit conversions if applicable.
3.5 Alarm Function
The ST9604 features a red backlight alarm and a sound alarm. These alarms are triggered when the measured sound level exceeds a predefined threshold. Refer to Figure 4 for visual examples of the alarm indications.
3.6 Auto Power Off
The device is equipped with an auto power-off feature to conserve battery life. It will automatically shut down after a period of inactivity. This feature is indicated by an icon on the display (refer to Figure 5).
4. Maintenance
4.1 Cleaning the Device
Wipe the device with a soft, dry cloth. Do not use abrasive cleaners or solvents. Ensure the microphone area is kept clean and free from dust or debris. The microphone is protected by a dustproof cotton cover (see Figure 6).
4.2 Battery Replacement
When the low battery indicator appears on the display (refer to Figure 5), replace all three AAA batteries promptly to ensure accurate readings and continuous operation. Follow the battery installation steps in Section 2.1.
4.3 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.
5. Troubleshooting
- Device does not power on: Check if batteries are installed correctly and have sufficient charge. Replace batteries if necessary.
- Inaccurate readings: Ensure the microphone is clean and unobstructed. Avoid measuring in environments with strong electromagnetic interference.
- Display is dim or flickering: This may indicate low battery power. Replace batteries.
- No sound alarm: Verify that the alarm function is enabled and the sound level threshold is set appropriately.
6. Specifications
| Feature | Specification |
|---|---|
| Product Name | Sound Level Meter |
| Model Number | ST9604 |
| Measurement Range | 30 ~ 130 dBA |
| Sound Accuracy | ±1.5 dB |
| Sound Resolution | 0.1 dB |
| Frequency Weighting | A Weighting |
| Frequency Range | 31.5 Hz ~ 8.5 KHz |
| Sampling Rate | 2 times/second |
| Temperature Measurement | -10 °C ~ 50 °C (14 °F ~ 122 °F) |
| Temperature Accuracy | ±2 °C |
| Temperature Resolution | 0.1 °C |
| Digital Display | 4 digit, Color LCD |
| Microphone | 1/2 inch Electret Condenser |
| Data Hold | Maximum and Minimum hold |
| Power Supply | 3 x AAA Batteries (not included) |
| Product Size | 151mm (L) x 51.5mm (W) x 26.5mm (D) |
| Product Weight | 95g |
7. Applications
The GVDA ST9604 is versatile and can be used in various settings for noise measurement:
- Construction Noise Monitoring
- Sound Insulation Material Testing
- Vehicle Noise Assessment (Car Noise)
- Mechanical Noise Analysis
- Library and Quiet Zone Monitoring
- Hospital Environment Noise Measurement
8. User Tips
- Understand A-Weighting: The meter uses A-weighting, which approximates the human ear's response to sound. This is suitable for general environmental noise measurements.
- Microphone Care: Always ensure the microphone is clean and the dustproof cotton is in place for accurate readings and to prolong the life of the sensor.
- Stable Readings: For the most stable readings, hold the meter steady and avoid obstructing the microphone with your hand or other objects.
- Environmental Factors: Be aware that factors like wind, humidity, and temperature can slightly influence sound measurements.
9. Warranty and Support
For warranty information, please refer to the documentation provided at the time of purchase or contact the seller directly. For technical support or inquiries, please reach out to GVDA Official Store customer service.
