GAIN EXPRESS SLM-267 Small Digital Sound Level Meter User Manual

1. Introduction

This manual provides detailed instructions for the proper use and maintenance of your GAIN EXPRESS SLM-267 Small Digital Sound Level Meter. Please read this manual thoroughly before operation to ensure accurate measurements and safe handling of the device. This device is designed for sound quality management in various environments.

Figure 1: GAIN EXPRESS SLM-267 Digital Sound Level Meter

2. Product Overview

The GAIN EXPRESS SLM-267 is a compact and portable digital sound level meter featuring a backlit LCD display for clear readings. It is equipped with functions for maximum/minimum value measurement, data hold, and automatic power-off to conserve battery life. A windscreen is included to minimize wind noise during outdoor measurements.

2.1 Components and Display

Figure 2: Labeled Diagram of the SLM-267

• Electret Condenser Microphone: Captures sound. Use the included windscreen to reduce wind interference.
• LCD Display: Shows measurement values, battery level, mode indicators (HOLD, MIN, MAX, OVER), and units (dBA).
• Power/Backlight Button: Turns the device on/off and controls the display backlight.
• MIN/MAX Button: Toggles between current, minimum, and maximum sound level readings.
• HOLD Button: Freezes the current measurement on the display.
• Tripod Mount: A 1/4-inch screw hole for mounting on a tripod (tripod not included).
• Battery Cover: Located on the back for battery installation.

Figure 3: Microphone with Windscreen

3. Setup

3.1 Battery Installation

1. Locate the battery cover on the back of the device.
2. Slide the battery cover downwards to open it.
3. Insert three (3) AAA 1.5V batteries, ensuring correct polarity (+/-) as indicated inside the compartment.
4. Slide the battery cover back into place until it clicks securely.

3.2 Tripod Mounting (Optional)

The device includes a 1/4-inch screw hole on the back for mounting onto a standard tripod. This can be useful for stable, long-term measurements or when hands-free operation is desired. Ensure the tripod is stable before mounting the device.

Figure 4: Tripod Mount

4. Operating Instructions

4.1 Power On/Off

• To Power On: Press the Power/Backlight button once. The display will light up and begin showing real-time measurements.
• To Power Off: Long press the Power/Backlight button for approximately 2 seconds.

4.2 Backlight Control

• While the device is powered on, press the Power/Backlight button briefly to toggle the display backlight on or off.

Figure 5: Backlit Display for improved visibility.

4.3 Mode Selection (MIN/MAX)

• Press the MIN/MAX button to cycle through measurement modes: Current Value → Minimum Value (MIN) → Maximum Value (MAX).
• The corresponding indicator (MIN or MAX) will appear on the display.

4.4 Data Hold Function

• Press the HOLD button to freeze the current measurement on the display. The "HOLD" indicator will appear.
• Press the HOLD button again to release the data hold and resume real-time measurements.

4.5 Backlight Alarm Setting

• When the measured value exceeds a preset threshold, the backlight will flash as an alarm. The initial default threshold is 100dB.
• To adjust the alarm threshold: While in HOLD mode, long press the Power/Backlight button for 2 seconds. Use the left and right buttons (MIN/MAX and HOLD) to adjust the setting value. Press the Power/Backlight button again to confirm and exit the setting.

4.6 Automatic Shutdown

• The device will automatically power off after 10 minutes of inactivity to save battery.
• To disable automatic shutdown: Long press the Power/Backlight button for 3 seconds when turning on the device. The display will show "UOF" (User Off) to indicate that auto-shutdown is disabled.

5. Measurement Procedure

To take a measurement, ensure the device is powered on and held in the desired measurement area. The display will show the real-time sound level in dBA. For accurate readings, ensure the microphone is pointed towards the sound source and is not obstructed.

5.1 Practical Applications

The GAIN EXPRESS SLM-267 is suitable for a wide range of applications, including:

• Environmental noise monitoring in factories, offices, and residential areas.
• Assessing noise levels in vehicles, schools, and theaters.
• Checking audio system performance.
• Monitoring noise on transportation routes and construction sites.
• General noise engineering and health prevention assessments.

Figure 6: Wide Range of Applications

6. Specifications

Figure 7: Key Specifications

Figure 8: Device Dimensions and Weight

7. Maintenance

• Keep the device clean and dry. Avoid exposure to extreme temperatures, humidity, or direct sunlight.
• Do not drop or subject the device to strong impacts.
• When not in use for extended periods, remove the batteries to prevent leakage and damage.
• Clean the exterior with a soft, dry cloth. Do not use abrasive cleaners or solvents.
• Ensure the windscreen is properly fitted over the microphone to protect it from dust and debris.

8. Troubleshooting

• Device does not power on: Check if the batteries are installed correctly with the right polarity. Ensure batteries are not depleted and replace if necessary.
• Inaccurate readings: Ensure the microphone is not obstructed and the windscreen is clean. Avoid measuring in strong wind without the windscreen. Check for any physical damage to the microphone.
• Display is dim or flickering: Replace batteries if the battery indicator shows low power. If the backlight is off, press the Power/Backlight button to turn it on.
• "OVER" displayed: The measured sound level exceeds the device's maximum range (130dBA). Move to a quieter environment or use a device with a higher measurement range.

9. Warranty and Support

For warranty information or technical support, please refer to the contact details provided with your purchase or visit the official GAIN EXPRESS website. Keep your purchase receipt as proof of purchase for warranty claims.