CLASS 1 ACOUSTIC ANALYSER SOUND LEVEL METER FOR RENT
1 DAY = 3000 AED
2 DAYS = 4000 AED
3 DAYS = 5000 AED
4-7 DAYS = 1500 AED/DAY
7-15 DAYS = 1000-1200 AED/DAY
1 MONTH = 20000-25000 AED

Technical Explanation of a Class 1 Sound Level Meter
1. Measurement Principle

• Reference accuracy: approximately ±1 dB

• Dynamic range: typically 20 dB to 140 dB

• Frequency range: approximately 10 Hz to 20 kHz

• Higher immunity to environmental influences such as:

• Temperature variations

• Humidity changes

• Electromagnetic interference

• A-weighting (dBA): Simulates human hearing sensitivity; used for occupational and environmental noise assessments.

• C-weighting (dBC): Used for measuring high-level and low-frequency noise.

• Z-weighting (dBZ): Flat or unweighted response over the measurement range.

• Fast (F): 125 ms time constant

• Slow (S): 1 s time constant

• Impulse (I): 35 ms attack and 1.5 s decay

• Class 1: 10 Hz to 20 kHz

• Maintains small permissible deviations across the entire spectrum.

• Low-frequency industrial noise

• High-frequency equipment noise

• Complex environmental sound sources

• Lower limit: approximately 20 dB

• Upper limit: approximately 140 dB

• Libraries (~30 dBA)

• Offices (~60 dBA)

• Industrial machinery (~90–110 dBA)

• Aircraft noise (>120 dBA)

• Reference frequency: 1 kHz

• Reference level: 94 dB or 114 dB

• Environmental noise surveys

• Occupational noise exposure measurements

• Building and room acoustics testing

• Airport and traffic noise studies

• Legal and regulatory compliance monitoring

• Research and laboratory applications

A Class 1 Sound Level Meter (SLM) is a precision-grade electroacoustic measuring instrument designed to measure Sound Pressure Level (SPL) in decibels (dB) according to the requirements specified in IEC 61672-1.

The instrument converts acoustic pressure variations in air into an electrical signal and processes it to calculate the sound level.

Measurement chain:

Sound Wave (Pa) → Microphone → Preamplifier → Frequency Weighting → Time Weighting → RMS Detector → DSP/Processor → Display (dB)

Class 1 meters are manufactured with tighter tolerances and lower uncertainties than Class 2 instruments.

Typical tolerances:

A Class 1 SLM applies standardized weighting filters:

The meter processes sound using standardized response times:

These settings determine how rapidly the meter responds to changing sound levels.

The microphone and electronics must maintain accurate measurements over a wide frequency range:

This makes Class 1 meters suitable for measuring:

A Class 1 meter must accurately measure both very quiet and very loud sounds.

Example:

This wide range allows measurement of:

Class 1 instruments require periodic calibration using a precision acoustic calibrator, commonly:

Calibration ensures the instrument maintains traceability and measurement uncertainty within Class 1 specifications.

Because of their higher precision and lower uncertainty, Class 1 sound level meters are used for:

A Class 1 Sound Level Meter is a precision electroacoustic instrument that measures sound pressure levels with stringent accuracy, frequency response, and environmental stability requirements as specified by IEC 61672-1, providing measurements suitable for professional, scientific, and regulatory purposes.