SMART SENSOR Digital Sound Level Meter

1. Introduction

The SMART SENSOR AS834+ and AS844+ are advanced digital sound level meters designed for accurate noise volume and decibel monitoring. These instruments are suitable for a wide range of applications, including personal use, family environments, business settings, academic studies, and industrial noise control. They provide precise measurements to help users check, monitor, or control sound levels effectively.

The AS844+ model offers enhanced features such as data storage, real-time temperature and humidity display, and computer connectivity for data analysis.

2. Safety Information

• Always handle the device with care to prevent damage.
• Do not expose the device to extreme temperatures, humidity, or direct sunlight.
• Keep the device away from strong electromagnetic fields.
• Ensure the battery compartment is securely closed during operation.
• Do not attempt to disassemble or modify the device, as this will void the warranty and may cause injury.
• Dispose of batteries according to local regulations.

3. Package Contents

Please check the package contents upon receipt. Depending on the model (AS834+ or AS844+), your package should include:

• Digital Sound Level Meter (AS834+ or AS844+)
• Sponge Ball (Windscreen)
• Storage Pouch / Sturdy Storage Case (for AS844+)
• USB Cable (for AS844+)
• Software CD (for AS844+)
• User Manual
• Calibration Certificate (for AS844+)

4. Product Overview

Familiarize yourself with the components and controls of your sound level meter:

• Condenser Microphone: Captures sound waves for measurement. Attach the sponge ball (windscreen) to reduce wind noise.
• Display: Large LCD color display shows sound level, temperature, humidity (AS844+), and other indicators.
• Buttons:
  • Power Button: Switch the device on/off.
  • F/S (FAST/SLOW) Button: Selects dynamic characteristic mode (Fast or Slow response time).
  • A/C Button: Selects frequency weighting (A-weighting for ambient noise, C-weighting for mechanical noise).
  • LEVEL Button: Adjusts the measurement shift/range.
  • MIN/MAX Button: Toggles between maximum/minimum value measurement.
  • SET Button (AS844+): Used for alarm setting and other configurations.
• USB Port (AS844+): For connecting to a computer for data communication and analysis.
• AC Output Port (AS844+): Provides an AC analog signal output (1 Vrms/full bar grp).
• DC Output Port (AS844+): Provides a DC pulse output.

5. Specifications

5.1. Model AS834+

5.2. Model AS844+

6. Setup

6.1. Battery Installation

• For AS834+: Open the battery compartment cover on the back of the device. Insert a 9V battery, ensuring correct polarity. Close the cover securely.
• For AS844+: The device uses a 3.7V Lithium battery. Ensure it is charged via the USB 5V port if needed.

6.2. Attaching the Sponge Ball (Windscreen)

Gently slide the provided sponge ball over the microphone at the top of the device. This helps to minimize wind noise and protect the microphone during outdoor measurements.

6.3. Software Installation (AS844+ only)

For the AS844+ model, insert the provided software CD into your computer's CD/DVD drive and follow the on-screen instructions to install the data analysis software. This software allows for data download, real-time sampling analysis, and graph/data printing.

7. Operating Instructions

7.1. Power On/Off

Press the Power Button () to turn the device on. Press and hold the button to turn it off. The AS844+ model features automatic power-off after 10 minutes of inactivity.

7.2. Selecting Measurement Range (LEVEL)

Press the LEVEL button to cycle through different measurement ranges (e.g., 30~80dB, 30~130dB, 50~100dB, 80~130dB). Select the range appropriate for the noise level you are measuring.

7.3. Selecting Frequency Weighting (A/C)

Press the A/C button to switch between A-weighting and C-weighting:

• A-Weighting: Simulates the human ear's response to sound, commonly used for environmental noise measurement.
• C-Weighting: Provides a flatter response, suitable for measuring mechanical noise or peak sound levels.

7.4. Selecting Dynamic Characteristic (F/S)

Press the F/S button to choose between Fast and Slow response times:

• FAST: For measuring rapidly changing noise levels.
• SLOW: For measuring average noise levels over time.

7.5. Maximum/Minimum Value Measurement (MIN/MAX)

Press the MIN/MAX button to display the maximum or minimum sound level recorded during a measurement session. Press again to exit this mode.

7.6. Alarm Setting (AS844+ only)

The AS844+ model allows setting an alarm level between 90-130dB. When the measured sound level exceeds this preset alarm level, the device will hold the maximum value. Refer to the detailed PDF manual for specific steps on setting the alarm.

7.7. Real-Time Temperature and Humidity Display (AS844+ only)

The AS844+ model displays real-time temperature (switchable between °C/°F) and humidity on its screen, providing additional environmental data.

7.8. Data Storage and Computer Communication (AS844+ only)

The AS844+ can store up to 15,000 groups of data. Connect the device to a computer using the provided USB cable to download recorded data, perform real-time sampling analysis, and print graphs or data reports using the dedicated software.

7.9. AC and DC Signal Output (AS844+ only)

The AS844+ provides AC and DC signal outputs for connection to external devices such as frequency analyzers, level recorders, FFT analyzers, or graphic recorders. The AC output is 1 Vrms/full bar grp, and the DC output is a 10mV/dB pulse.

7.10. Quick Measurement

Both models offer quick measurement with a sampling frequency of 2 seconds per time, allowing for rapid assessment of noise levels.

7.11. Product Overview Video

8. Maintenance

• Cleaning: Use a soft, dry cloth to clean the device. Do not use abrasive cleaners or solvents.
• Storage: When not in use, store the sound level meter in its protective pouch or case in a cool, dry place, away from direct sunlight and extreme temperatures. Adhere to the specified storage temperature (-10°C to 60°C) and humidity (10%-70%RH) ranges.
• Battery: If the device will not be used for an extended period, remove the batteries to prevent leakage.
• Calibration: For professional applications requiring high accuracy, periodic calibration by a certified laboratory is recommended.

9. Troubleshooting

• Device does not power on: Check if the batteries are correctly installed and have sufficient charge. Replace batteries if necessary.
• Inaccurate readings: Ensure the microphone is clean and the sponge ball is properly attached. Verify that the correct frequency weighting (A/C) and dynamic characteristic (Fast/Slow) modes are selected for your measurement environment.
• Display issues: If the display is dim or unreadable, check battery levels. Ensure the device is not exposed to extreme temperatures.
• AS844+ data transfer issues: Ensure the USB cable is securely connected to both the device and the computer. Verify that the data analysis software is correctly installed and running.
• Low battery indication: Replace or recharge the batteries as soon as possible to ensure continuous operation and accurate readings.

10. User Tips

• For consistent readings, always hold the meter at arm's length, pointing the microphone towards the sound source.
• Avoid blocking the microphone with your hand or other objects.
• When measuring outdoor noise, always use the sponge ball to minimize wind interference.
• For long-term monitoring (AS844+), utilize the data storage and computer connectivity features to track noise trends over time.
• Consider the type of noise you are measuring (e.g., continuous, impulsive) when selecting the Fast or Slow response mode.

11. Warranty & Support

This product is covered by an after-sales service within 1 year of purchase. All delivered products are tested before shipping to ensure full functionality.

For further assistance or detailed instructions, please refer to the comprehensive user manual available in PDF format. You can access the PDF manual via the following link: View User Manual (PDF).

For technical support or service inquiries, please contact your retailer or the manufacturer directly.