What is Sound Level Meter?

A Sound Level Meter (SLM) is a compact portable instrument, usually battery-powered, used to measure directly sound-pressure levels while incorporating frequency weighting networks which approximate the inverse of equal loudness contours at various levels.

According to the International Standards (IEC 60942:2017), Sound Level Meter is categorized into 2 different classes based on its accuracy:

  • Class 1—Precision grade with a tolerance of ±0.5 dB. It is ideal for industrial and laboratory use. 
  • Class 2—General purpose grade with a tolerance of ±1.0 dB. It is ideal for basic noise environmental measurements.

Class 1 Sound Level Meter ST-11D

Class1ComplieswithIEC61672:2013,DataLogging,SoundRecording,widemeasuringrange27-140dB,10 Hz-20kHzfrequencyrange,27dB-140dBmeasurementrange,MeasuresanddisplaysLeqvalue
• Class 1 Complies with IEC-61672-2013
• 10 Hz-20k Hz frequency range
• 27 dB-140 dB measurement range
• A / C / Z / B frequency weighting
• Stores 8000 groups measurement results including Timestamp, %Dose, TWA
• Data logging & record function(St-11D)
• Measures and displays Leq value
• Long term measurement
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Class 1 Sound Level Meter ST-109

IEC61672-1:2002Class1,ANSIS1.4Type1,CNSNO.7129Type1,JJG-188-2002Class1,usedforUKControls ofNoiseatWorkRegulations,OSHAOccupationalNoisestandards
• Fast, slow, Impulse response times.
• Wide frequency range: 10Hz~20KHz.
• Wide measurement range: 30dB~130dB
• Wide dynamic range: 100 dB
• A / C / Z frequency weighting
• Sound Exposure Level SEL, Peak, Reverberation Time (RT60)
• Stored up to 32,000 records, auto-mating
• Remote control through connected PC
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Noise Dosimeter ST-130

meetthestandarddosemeasurementofOHSA,IECandISOregulations,small,lightweight,cable-freedesigns,OSHA&IECNoiseDosimeter

• Perform OSHA and IEC noise accumulation surveys
• 6 built-in standard dose measurement setups: OSHA/ MSHA/DOD/ACGIH/ISO85/ISO90
• Data logger up to 10,00,000 readings
• Adjustable criterion level, exchange rate & threshold
• Sampling times between 1 sec to 2 hr
• Dose Meter Mode: record time stamp, %Dose, TWA8, LEP, 8h, Leq, SEL, LN%, SPLmax, SPLmin, PeakMAX
• Sound Level Meter mode: Leq, PeakMAX & SEL

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ST-11/11D Class 1 Sound Level Meter

Class1ComplieswithIEC61672:2013,DataLogging,SoundRecording,widemeasuringrange27-140dB,10 Hz-20kHzfrequencyrange,27dB-140dBmeasurementrange,MeasuresanddisplaysLeqvalue
• Class 1 Complies with IEC-61672-2013
• 10 Hz-20k Hz frequency range
• 27 dB-140 dB measurement range
• Data logging & record function(St-11D)
• Measures and displays Leq value
• Long term measurement
Learn More

ST-109 Class 1 Sound Level Meter

IEC61672-1:2002Class1,ANSIS1.4Type1,CNSNO.7129Type1,JJG-188-2002Class1,usedforUKControls ofNoiseatWorkRegulations,OSHAOccupationalNoisestandards
• Fast, slow, Impulse response times.
• Wide frequency range: 10Hz~20KHz.
• Wide measurement range: 30dB~130dB
• Wide dynamic range: 100 dB
• A / C / Z frequency weighting
• Sound Exposure Level SEL, Peak, Reverberation Time (RT60)
• Data logger function, stored up to 32,000 records,auto-mating
• Remote control through connected PC
Learn More

ST-130 Noise Dosimeter

meetthestandarddosemeasurementofOHSA,IECandISOregulations,small,lightweight,cable-freedesigns,OSHA&IECNoiseDosimeter
• Perform OSHA and IEC noise accumulation surveys
• 6 built-in standard dose measurement setups: OSHA/ MSHA/DOD/ACGIH/ISO85/ISO90
• Data logger up to 10,00,000 readings
• Adjustable criterion level, exchange rate & threshold
• Sampling times between 1 sec to 2 hr
• Stores up to 10,000 dose meter survey results
• Dose Meter Mode: record time stamp, %Dose, TWA8, LEP, 8h, Leq, SEL, LN%, SPLmax, SPLmin, PeakMAX
• Sound Level Meter mode: Leq, PeakMAX & SEL
• USB interface. Support Windows XP / Vista / 7 / 8
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How Does Sound Level Meter Work?

The sound level meter consists of 3 main basic parts; a microphone, electronic circuits, and a display.The microphone contains a flexible membrane that detects small air pressure variations associated with sound and converts them into electrical signals. These signals are then processed using the electronic circuitry (see pict below), detected, and then displayed the sound level in decibels on the meter screen.

Standard sound level meters are designed to read the sound level with fast or slow exponential time averaging (IEC 60804:2000):

    • Fast exponential time averaging has a 125 ms exponential time constant , that corresponds to the integration time of the ear (The human ear does not represent a linear system and does not register sounds with a duration less than 125 ms).
    • Slow exponential time averaging has a 1s exponential time constant, that estimates the average noise level with a greater precision.

Why Do You Need Sound Level Meter?

PREVENT HEARING LOSS

According to The Center for Disease Control (CDC) ,about  22 million workers are exposed to potentially damaging noise at work each year.. 

Continuous exposure to loud noise kills the nerve endings in the inner ear. More exposure will result in more dead nerve endings which can result in permanent hearing loss. Permanent hearing loss is a forever existing condition that cannot be restored to normal condition through surgery, therapy, or with medicine. It limits the ability to hear and to understanding speech which seriously weaken your communication.

Whether you work at construction site, airport, or anywhere with loud noise , hearing loss is preventable through the use of tools such as Sound Level Meters- devices that measures sound levels and provides noise exposure parameters to help prevent hearing hazard.

Some others serious health issues caused by long-term high include the following:

  • Heart Disease
  • Hypertension
  • Stress 
  • Sleep Trouble

SAFETY STANDARD

Under OSHA’s Noise Standard, when noise exposure is at or above 85 decibels averaged over 8 working hours, or an 8-hour time-weighted average (TWA), employers must reduce noise exposure to a safer levels according to its safety guideline. (Read more: hearing conservation program https://www.osha.gov/noise/hearing-programs) 

Need More information about Class 1 Sound Level Meters?

A Class 1 Sound Level Meter is a noise measurement instrument that meets the requirements of IEC 61672-1:2002 (or an equivalent such as BS EN 61672-1:2003) to Class 1 performance. This standard specifies two levels of performance, Class 1 and Class 2, with Class 1 being effectively more accurate.

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Sound Level Meter - Overview

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