1. Introduction
The TASI TA650A Digital Sound Level Meter is an environmental sound level instrument designed for accurate measurement of sound levels. It is suitable for a wide range of applications, including factories, workshops, schools, residential areas, offices, traffic roads, and audio environments.
Figure 1: Front view of the TASI TA650A Digital Sound Level Meter.
2. Key Features
- Large Measurement Range: Capable of measuring sound levels from 30.0 to 130 dBA with an accuracy of ±1.5dB.
- Maximum/Minimum Value Hold: Easily capture and display the maximum or minimum sound level recorded during a measurement session.
- High Definition Large LCD Screen: Features a clear LCD screen with white backlight, ensuring readability even in low-light conditions.
- Time Weighting Options: Switch between Fast (0.125s) and Slow (1s) time weighting to suit different measurement requirements.
- High Precision Microphone: Equipped with a highly sensitive 1/2-inch capacitive microphone for accurate and instantaneous response.
- Auto Power Off: Automatically powers off after 15 minutes of inactivity to conserve battery life (can be disabled).
Figure 2: Overview of the meter's functions.
3. Package Contents
Please check the package contents upon receipt to ensure all items are present and undamaged:
- 1 x TASI TA650A Digital Sound Level Meter
- 1 x Drawstring Bag
- 1 x User Manual (English)
Figure 3: Standard accessories included in the package.
4. Setup
4.1. Battery Installation
- Locate the battery compartment cover on the back of the device.
- Slide or unclip the cover to open the compartment.
- Insert two (2) 1.5V AAA (R03/LR03) batteries, ensuring correct polarity (+/-).
- Close the battery compartment cover securely.
Figure 4: Device overview with button labels and dimensions.
4.2. Windshield Installation
Gently place the foam windshield over the microphone at the top of the device. This helps to reduce wind noise and improve measurement accuracy in outdoor environments.
5. Operating Instructions
5.1. Power On/Off
Press the Power button (red circle with a line) located on the front panel to turn the device on or off.
5.2. Taking Measurements
Once powered on, the device will immediately begin displaying sound level measurements in dBA. Hold the meter in the area where you wish to measure the sound level, ensuring the microphone is pointed towards the sound source.
Video 1: Product demonstration showing usage and features.
5.3. MAX/MIN Value Hold
Press the MAX button to display the maximum sound level recorded since the device was powered on or the MAX function was activated. Press the MIN button to display the minimum sound level recorded. Press the respective button again to exit MAX/MIN mode.
5.4. Data Hold
Press the HOLD button to freeze the current reading on the display. Press it again to release the hold and resume live measurements.
5.5. Time Weighting (FAST/SLOW)
Press the F/S button to toggle between Fast (0.125s) and Slow (1s) time weighting. Fast weighting is suitable for capturing sudden noise peaks, while slow weighting provides a more averaged reading for stable noise levels.
5.6. Backlight
Press the Backlight button (light bulb icon) to turn the LCD backlight on or off for improved visibility in various lighting conditions.
5.7. Auto Power Off
The device is configured to automatically power off after 15 minutes of inactivity. This feature can be disabled if continuous operation is required (refer to advanced settings in the full user manual if available).
6. Specifications
| Parameter | Value |
|---|---|
| Model | TA650A |
| Measurement Range | 30.0 ~ 130 dBA |
| Accuracy | ±1.5dB (sound pressure reference, 94dB@1kHz) |
| Resolution | 0.1dB |
| Frequency Weighting | dBA |
| Display | 4 digits, max 1999 |
| Frequency Response | 31.5Hz ~ 8kHz |
| Microphone | High precision 1/2 inch capacitive microphone |
| Time Weighing | FAST: 0.125s, SLOW: 1s |
| Sampling Rate | 2 times/s |
| Auto Power Off | 15 mins (can be disabled) |
| Working Environment | -10 ~ 50℃, Max 80%RH, indoor altitude < 2000m |
| Storage Environment | -10 ~ 50℃, Max 70%RH (battery removed) |
| Screen Size | 34 x 31mm |
| Power Supply | 2 x 1.5V AAA (R03/LR03) (Not included) |
| Item Size | 167 x 59 x 31mm |
| Item Weight | 114g |
Figure 5: Detailed technical specifications.
7. Maintenance
- Cleaning: Use a soft, dry cloth to clean the device. Do not use abrasive cleaners or solvents.
- Storage: When not in use for extended periods, remove the batteries to prevent leakage and store the device in a dry environment between -10℃ and 50℃ with maximum 70% relative humidity.
- Microphone Care: Keep the microphone clean and free from dust or debris. Always use the windshield to protect the microphone.
8. Troubleshooting
- Device does not power on: Check if the batteries are inserted correctly and have sufficient charge. Replace batteries if necessary.
- Inaccurate readings: Ensure the microphone is clean and the windshield is properly installed. Avoid measuring in extremely windy conditions without proper shielding. Verify the device is within its specified operating environment.
- Display is dim or blank: Check battery level. If the backlight is off, press the backlight button.
9. User Tips
- For best accuracy, hold the meter steady and avoid obstructing the microphone.
- When measuring intermittent noise, use the MAX hold function to capture the highest sound level.
- Consider the environment: high humidity or extreme temperatures can affect measurement accuracy.
10. Warranty and Support
For warranty information or technical support, please refer to the documentation provided with your purchase or contact the seller directly. Keep your proof of purchase for any warranty claims.