Calibrating the Frequency Response of a Working Standard Microphone

Calibrating the Frequency Response of a Working Standard Microphone

Calibration, Microphone /

In the calibration of a Working Standard Microphone (WSM), in addition to sensitivity calibration, one of the most important characteristics is its frequency response. Since every microphone exhibits different sensitivity across the frequency range, verifying and documenting the frequency response is essential to ensure that acoustic measurements in practical applications are accurate and comparable according […]

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Comparison chart of ASTM vs ISO transmission loss standards, showing ASTM with STC and U.S.-specific use, and ISO with Rw rating, global methodology, and spectrum corrections.

ASTM vs ISO Transmission Loss Measurements in Thailand | Acoustic Laboratory Thailand

ASTM, ISO /

ASTM vs ISO Transmission Loss Measurements in Thailand | Acoustic Laboratory Thailand ASTM vs ISO Transmission Loss Measurements: Why Thailand Follows ASTM Standards and What the Future Holds At Acoustic Laboratory Thailand, an ISO17025 accredited acoustic laboratory, we are often asked about the differences between ASTM and ISO transmission loss measurements. While both frameworks are

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How to use a boom in an acoustic laboratory

Standards and Testing of Sound Barriers

ISO, Sound Absorption, Sound Transmission Class, Weighted Sound Reduction Index /

Standards and Testing of Sound BarriersThe effectiveness of a sound barrier cannot be assessed by design or materials alone—it must be verified with internationally recognized test results. Acoustic Laboratory Thailand Co., Ltd. (ALT) offers expert sound barrier testing in a laboratory setting (Lab Test) according to the following international standards: Laboratory Test 1. Sound Transmission

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Testing of STC (Sound Transmission Class) and Rw (Weighted Sound Reduction Index)

Testing of STC (Sound Transmission Class) and Rw (Weighted Sound Reduction Index)

ISO, Sound Transmission Class, Weighted Sound Reduction Index /

Sound Transmission Class and Weighted Sound Reduction Index test Acoustic Laboratory Thailand Co., Ltd. (ALT) provides sound insulation testing services for wall systems, doors, windows, and glass according to international standards ASTM E90 and ISO 10140-2. The tests are conducted using the Twin Reverberation Chambers method, with completely isolated chambers. Our test facility is designed

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Using a Moving Microphone in Testing STC for Material Sound Insulation

Using a Moving Microphone in Testing STC for Material Sound Insulation

Acoustic Camera, Calibration, Newsletter, Sound Absorption /

Acoustic Laboratory Thailand (ALT) uses a Moving Microphone to test Airborne Sound Insulation (STC, Rw) to achieve the highest level of accuracy in acoustic testing. Measuring the Sound Transmission Class (STC) is a crucial process for evaluating the sound insulation performance of materials and structures according to ASTM E90 and ISO 10140-2 standards. Typically, STC

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(dodecaheron) speaker directivity calibration

(dodecaheron) speaker directivity calibration

Calibration /

When is the late time that you calibrated your dodecahedron or other speaker used for acoustic measurements? Recommended period is not over 2 years. Speaker Testing Services According to Standards by ALT LaboratoryAt Acoustic Laboratory Thailand Co., Ltd. (ALT), we are committed to providing testing and calibration services for acoustic equipment in accordance with international

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Initial material inspection before testing with Acoustic Camera

Initial material inspection before testing with Acoustic Camera

Acoustic Camera /

This video is an introduction to the service of checking the materials before testing with (Acoustic Camera), which is an important step in evaluating the performance and installation of materials to ensure that the materials used can reduce or block noise as expected. This will help the materials to be installed correctly and ready for

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Calibration of sound meters according to standards

Calibration, ISO /

Using standardized sound measurement instruments also requires standardized calibration. It is important to choose a calibration laboratory that is certified to ISO/IEC17025 standards. But this is not all to look out for, the laboratory should also be accredited for the required methods and standards for the calibration of instruments. ISO/IEC17025 has a wide range and

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ALT, Acoustic Laboratory (Thailand) Achieves ISO 17025 Accreditation, Demonstrating Commitment to Excellence in Acoustic Testing 

ISO /

[Bangkok, Thailand, 18 December 2023] – ALT, Acoustic Laboratory (Thailand), a leading provider of acoustic testing services in Thailand, is proud to announce that it has achieved ISO 17025 accreditation, a significant milestone that underscores the company’s dedication to delivering high-quality and reliable acoustic testing solutions.  ISO 17025 is an internationally recognized standard that specifies

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How and why to calibrate Acoustic measurement instruments

Calibration /

How to calibrate Acoustic measurement instruments Why calibrate Acoustic measurement instruments There are many reasons why acoustic instrument calibration is important. Here are a few of the most important ones:  Accuracy and Reliability: Sound level meters are precision instruments that measure sound pressure levels. Over time and with usage, their performance can drift. Calibration ensures

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