Locate Us 11 Kallang Place #06-03 Singapore 339155
Operating Hours Mon - Fri | 9am - 5pm


Absolute Laboratories Pte. Ltd. calibrates sound level meter, sound calibrators, noise dosimeters, and vibration monitors.

Being an ISO/IEC 17025 SAC-SINGLAS accredited calibration laboratory for the scope of Acoustics and Vibration, our services provide additional confidence to customers, both local and overseas with our accredited reports and certificates, recognised under the ILAC-MRA (International Laboratory Accreditation Cooperation – Mutual Recognition Arrangement).

Our Calibration team also calibrates and service other EnvOHS measuring instruments such as heat-stress monitors, sampling pumps, flow calibrators etc.

Do contact us now for more information - ☎ (65) 6296 8012 | ✉ service@aisys.com.sg 



Q1. What is the difference between a field calibration vs lab calibration for a sound level meter?

A1. Field calibration are performed using a portable sound calibrator, and the test decibels and frequencies are usually limited to 114dB at 1kHz. Some portable sound calibrators have dual frequencies or/and dual levels. Field calibrations are sometimes referred to as a "bump" test, its purpose is to ensure that the sound level meters or/and noise dosimeters are functioning within the tolerance of the meter at that decibels (dB) level and frequency (Hz).

Calibrations performed at ISO/IEC 17025 accredited calibration laboratories, usually performed more tests. Depending on the scope and in-house procedures. Most reputable labs would reference the IEC 61672-3 Electroacoustics - Sound Level Meter - Part 3: Periodic Test, which describes procedures for periodic testing of time-weighting, integrating-averaging, and integrating sound level meters that were designed to conform to the class 1 or class 2 specifications of the IEC 61672-1. 

Below: Youtube (2:10) video from TSI Inc, demonstrating calibration of the Sound Examiner with a AC-300 AcoustiCal sound calibrator.


Q2. How frequent should I send my noise meter to a calibration laboratory for calibration? 

A2. Reference to MOM guide https://www.mom.gov.sg/faq/hygiene-monitoring/how-often-do-i-need-to-calibrate-equipment-used-for-noise-monitoring

For more information on accredited calibration reports and certificates for your sound level meters, sound calibrators and noise dosimeters, kindly contact us.

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