ALT Acoustical Calibration Services

ALT Accredited Calibration services for Soundlevel meters, microphones, pre-amplifiers, calibrators for all brands.

Acoustic Laboratory (Thailand) Co., Ltd. is located in Bangkok, Thailand, and is a fully independent laboratory certified to perform accredited acoustic calibrations for sensors (microphones) and acoustic instruments in compliance with ISO17025 (link to TISI certificate)

We calibrate microphones, calibrators, and sound measuring instruments.

Contact us for details on prices and lead-times.

We recommend that you contact us before sending the equipment to us to keep the time you’re without your equipment at a minimum. For daily verification of the performance of your sound measuring equipment Norsonic offer a range of sound calibrators.

The basic equipment for acoustical calibration is the Norsonic (Nor1504A) secondary calibration system, worldwide used in many ISO17025 accredited laboratories.

For calibration of accelerators, vibration meters etc. we are using state of the art SE-20 shaker with reference accelerometer from DAkkS accredited SPEKTRA Dresden, Germany.

Some of ALT services provided:

  • calibration of microphones
  • calibration of calibrators
  • calibration of sound level meters
  • check the proper functioning of microphones, calibrators, preamplifiers, sound level meters, dosimeters
  • establish the self-noise level of sound level meter
  • calibration of vibration meters
  • calibration of accelerometers

Typically recommended calibration intervals:

  • Sound level meters complying with  IEC 61672:Part 1, every year
  • Oher Soundlevelmeters, every year
  • Personal Dosemeters – every year
  • Microphones – every year
  • Sound Analyser for Building Acoustics, every 2 years
  • Acoustic Calibrators (Mechanical or Electronic) – every year

ALT performs calibration for major brands of sound level meters / analyzers such as

01dB, Aco, BK Precision, Bruel Kjaer, Casella, Castle, Cirrus, Cortex, Delta Ohm, Dicesva, Exotech Exair, Extech HI, IVIE Cygnet, Larson Davis, Metrosonics, Norsonic, Omega, Ono Sokki, Pulsar, Quest, Rion, SKF, Sencore, Sonoran, Svantek, Terrasonde, Testo and many more brands.