BENETECH GM1356 Digital Sound Level Meter

1. Introduction

The BENETECH GM1356 Sound Level Meter is a precision instrument designed to measure Sound Pressure Level (SPL) in decibels (dB). It is an essential tool for sound quality control in various environments, including factories, offices, homes, schools, restaurants, hospitals, and construction sites. This manual provides detailed instructions for the proper setup, operation, and maintenance of your GM1356 device.

2. Key Features

• Wide measurement range: 30~130dBA, 35~130dBC
• High accuracy: ±1.5 dB
• Designed according to IEC PUB 651 TYPE2 and ANSI S1.4 TYPE2 standards
• Modern, compact, and portable design
• Easy to use interface
• Frequency weighting characteristics: A & C
• Time weighting characteristics: Fast & Slow
• AC/DC output for external devices
• Bar graph indication on display
• Equipped with a sponge ball to filter unwanted wind noise during outdoor measurements
• Max reading hold function
• USB interface for computer communication
• Analysis software for data processing
• Automatic power off function to conserve battery life
• Overload indication: OVER/UNDER
• Automatic backlight display
• Low battery indication
• Can store up to 4700 records (GM1356 Only)
• PWM Output (GM1356 Only)
• Automatic Sensing Backlight (GM1356 Only)

3. Specifications

4. Product Overview

Familiarize yourself with the components and controls of your GM1356 Sound Level Meter.

• Sponge Ball: Reduces wind noise interference, especially during outdoor measurements.
• Photosensitive Sensor: For automatic backlight adjustment.
• Noise Value Display: Shows the current sound pressure level.
• Perpetual Calendar Clock: Displays time and date.
• Power Key: Turns the device on/off.
• MAX/CLOCK Key: Toggles maximum measurement hold or accesses clock settings.
• A/C CLEAR Key: Selects A or C frequency weighting and clears data.
• LEVEL Keys (Up/Down): Adjusts measurement level ranges and navigates menu options.
• F/S RECORD Key: Selects Fast/Slow time weighting and initiates data recording.
• USB Connection Port: For connecting to a computer for data transfer and analysis.
• AC Output Interface: For analog signal output.
• PWM Output Interface: For Pulse Width Modulation output.
• External Power Interface (DC 6V IN): For external power supply.

5. Setup

5.1. Battery Installation

1. Locate the battery compartment on the back of the device.
2. Slide open the battery cover.
3. Insert four (4) 1.5V AA batteries, ensuring correct polarity (+/-).
4. Close the battery cover securely.

Note: Batteries are not included with the device due to shipping regulations.

5.2. Initial Power On

Press the Power Key () to turn on the device. The LCD screen will light up, displaying the current sound level and other information.

6. Operating Instructions

6.1. Basic Measurement

1. Turn on the device using the Power Key.
2. Hold the meter with the microphone pointed towards the sound source.
3. The current sound pressure level will be displayed on the LCD screen.

6.2. Frequency Weighting (A/C)

Press the A/C CLEAR Key to switch between A-weighting and C-weighting. A-weighting is commonly used for environmental noise measurements, while C-weighting is suitable for measuring the peak sound level of machinery noise.

6.3. Time Weighting (Fast/Slow)

Press the F/S RECORD Key to toggle between Fast and Slow time weighting. Fast response is suitable for measuring rapidly changing noise levels, while Slow response provides an average reading for more stable noise levels.

6.4. Maximum Measurement Hold (MAX)

Press the MAX/CLOCK Key to activate the maximum measurement hold function. The display will show the highest sound level recorded since the function was activated. Press again to exit.

6.5. Data Recording (REC)

To record data, press and hold the F/S RECORD Key until the REC indicator appears on the screen. The device can store up to 4700 records. To stop recording, press and hold the key again.

6.6. Connecting to a Computer (USB)

The GM1356 can be connected to a computer via its USB port for real-time data sampling, download, and analysis. Use the provided USB cable and analysis software (if included) to perform these operations.

6.7. Video Demonstration

Watch this video for a visual demonstration of the BENETECH GM1356 Sound Level Meter in action.

7. Maintenance

7.1. General Care

• Keep the device clean and dry. Avoid exposure to dust, moisture, and extreme temperatures.
• Do not drop or subject the device to strong impacts.
• Store the device in a protective case when not in use.

7.2. Cleaning

• Wipe the device with a soft, dry cloth.
• Do not use abrasive cleaners or solvents.
• Ensure the microphone and sponge ball are free from debris.

7.3. Battery Replacement

When the low battery indicator appears on the display, replace all four (4) 1.5V AA batteries promptly to ensure accurate measurements and prevent data loss.

8. Troubleshooting

9. User Tips

• For consistent readings, always hold the meter at arm's length and point the microphone directly at the sound source.
• When measuring outdoor noise, always use the included sponge ball to minimize wind interference, which can significantly affect readings.
• Utilize the data recording feature for long-term monitoring or when you need to analyze noise trends over time.
• Regularly check the battery level, especially before critical measurements, to avoid interruptions.

10. Warranty and Support

The BENETECH GM1356 Sound Level Meter is covered by a 1-year guarantee from the date of purchase. This warranty covers manufacturing defects and malfunctions under normal use. For warranty claims or technical support, please refer to the contact information provided with your purchase documentation or visit the official BENETECH website.

Please note that the warranty does not cover damage caused by misuse, unauthorized modifications, or improper maintenance.