Metrix+ SL 4001 Sound Level Meter 30-130dB Noise Meter

A. Product Overview

The Metrix Plus SL 4001 is a handheld digital sound level meter developed for measuring and evaluating sound pressure levels in industrial, commercial and environmental applications.

It measures sound levels from 30 to 130 dB(A) and uses A frequency weighting, which is commonly used when evaluating noise according to the response of human hearing.

The meter incorporates a 6 mm condenser microphone and provides a stated accuracy of plus or minus 1.5 dB under specified reference conditions.

Its color display and bar graph make changing noise levels easy to observe during testing.

Important features include:

• Sound measurement range from 30 to 130 dB(A)
• A frequency weighting
• 6 mm condenser microphone
• Frequency range from 31.5 Hz to 8.5 kHz
• Stated accuracy of plus or minus 1.5 dB
• 0.1 dB digital resolution
• Digital sampling rate of 2 readings per second
• Bar graph sampling rate of 20 readings per second
• Maximum and minimum reading function
• Data hold function
• Selectable time weighting
• Ambient temperature measurement
• Ambient humidity measurement
• Over and under range indication
• Color display with negative display format
• Rechargeable 600 mAh lithium battery
• Type C charging
• Automatic power off after approximately 15 minutes of inactivity

The standard package includes the main unit, instruction manual, charging cable and gift box packing.

B. Working Principle

The Metrix Plus SL 4001 measures sound by detecting changes in air pressure created by sound waves.

Sound travelling through the air produces small variations in atmospheric pressure. The 6 mm condenser microphone inside the SL 4001 responds to these pressure changes.

The microphone converts the sound pressure into an electrical signal.

The instrument then processes this electrical signal and converts it into a logarithmic sound level value expressed in decibels.

The SL 4001 uses A frequency weighting. This weighting adjusts the measurement response according to different frequencies so that the displayed value more closely represents how human hearing responds to sound.

The processed sound level is shown numerically on the digital display. The bar graph also provides a faster visual representation of changes in noise level.

The digital display updates approximately twice per second, while the bar graph updates approximately 20 times per second.

C. Why It Is Used

The Metrix Plus SL 4001 is used when noise levels need to be measured, compared or monitored.

Excessive noise can affect workplace comfort, employee safety, machinery performance and the surrounding environment. A sound level meter provides an objective measurement instead of relying on a person's perception of whether a location sounds loud or quiet.

The SL 4001 can be used for:

• Workplace noise measurement
• Factory noise monitoring
• Machinery noise inspection
• Workshop noise testing
• Environmental noise surveys
• Industrial maintenance
• Office noise monitoring
• Equipment noise comparison
• Preventive maintenance checks
• Production area noise measurement
• Noise pollution studies
• Mining related noise measurement
• Aircraft noise assessment
• General acoustic level checking

Its maximum and minimum functions help identify variations in noise over a measurement period.

The bar graph is useful when sound levels are changing rapidly because it provides a visual indication of those changes.

Ambient temperature and humidity measurement provide additional environmental information during an inspection.

D. Suitable Buyers

The Metrix Plus SL 4001 is suitable for professionals and organizations that need a portable instrument for routine sound and noise measurement.

Typical buyers include:

• Industrial maintenance engineers
• Safety departments
• Factory maintenance teams
• Environmental testing professionals
• Facility management companies
• HVAC technicians
• Mechanical engineers
• Production departments
• Quality control departments
• Manufacturing plants
• Workshops
• Machine manufacturers
• Environmental consultants
• Educational institutions
• Laboratories
• Mining companies
• Building maintenance teams
• Service engineers
• Industrial contractors
• Noise survey professionals

It is particularly suitable for buyers who need a portable 30 to 130 dB(A) digital sound level meter with rechargeable battery operation and straightforward noise measurement functions.

Frequently Asked Questions

1. What is the Metrix Plus SL 4001?

The Metrix Plus SL 4001 is a portable digital sound level meter designed to measure environmental and industrial noise levels.

2. What is the measuring range of the SL 4001?

The SL 4001 measures sound levels from 30 to 130 dB(A).

3. What frequency weighting does the SL 4001 use?

The current SL 4001 specification uses A frequency weighting.

4. What is the accuracy of the Metrix Plus SL 4001?

The specified accuracy is plus or minus 1.5 dB under the stated reference condition of 94 dB at 1 kHz.

5. What type of microphone is used in the SL 4001?

The meter uses a 6 mm condenser microphone.

6. What is the frequency range of the SL 4001?

Its specified frequency range is 31.5 Hz to 8.5 kHz.

7. What is the resolution of the SL 4001?

The digital display provides a resolution of 0.1 dB.

8. How quickly does the digital display update?

The digital sound level display has a sampling rate of approximately two readings per second.

9. Does the SL 4001 have a bar graph?

Yes. It includes a bar graph display where each analog bar represents approximately 1 dB.

10. How quickly does the bar graph update?

The bar graph has a sampling rate of approximately 20 readings per second.

11. Does the SL 4001 have maximum and minimum measurement functions?

Yes. Maximum and minimum reading functions are available.

12. Does the SL 4001 have a data hold function?

Yes. Data hold allows the user to retain a measured value on the screen for easier viewing or recording.

13. Does the SL 4001 support time weighting selection?

Yes. The instrument provides selectable time weighting for sound measurements.

14. Can the SL 4001 measure temperature and humidity?

Yes. The product also provides ambient temperature and humidity measurement.

15. What happens when the sound level is outside the measuring range?

The instrument provides OVER and UNDER indications when the measured sound level exceeds or falls below the supported measurement range.