On these pages we address the variety of climatic and atmospheric tests that are carried out on products and materials.

But they are not the only types of tests on existing products and materials.

Acoustic testing in an anechoic chamber is a little-known example we discuss today.

How an Anechoic Chamber is made


The term anechoic chamber comes from ancient Greek and means "without echo".

The anechoic chamber is in fact a laboratory instrument which consists of an isolated environment structured in such a way as to reduce as much as possible the reflection of signals on the walls, including all types of waves, from electromagnetic to acoustic ones.

Anechoic chambers can be designed in different sizes depending on the use: there are very small models, such as benchtop climatic chambers, and extremely spacious models that fully fall within the definition of walk-in chambers.

The walls of the anechoic chamber are lined with special materials capable of absorbing the waves.

There are two main types of anechoic chamber liners:


  • Pyramids or wedges of spongy plastic material, suitably treated in order to maximize the wave absorption characteristics.
  • Ferrite panels, a material capable of converting the electromagnetic energy associated with the incident field into thermal energy.


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What is the Anechoic Chamber used for


The anechoic chamber test aims to verify the sound quality of a given product to be tested.

What are these products?

The most intuitive example is all consumer electronics that produce sounds, therefore mobile phones, computers, radios, televisions, speakers, loudspeakers and so on.

Ma non solo.

Let's also think of motors or air conditioners: the noise they produce - in addition to affecting the experience of the final consumer - is an important indicator of malfunctions of the product itself.

In this sense, the acoustic test in an anechoic chamber verifies the efficiency of the product in question, by measuring the sound it produces.

International Standards for Acoustic Testing in Anechoic Chambers


Acoustic tests in anechoic chambers are regulated internationally by legislation which prescribes the correct procedure for carrying them out and the criteria for evaluating the results.

Two organizations in particular regulate the various acoustic tests in anechoic chambers, ANSI, the American National Standards Institute, and ISO, the International Organization for Standardization.

Specifically, the standards in question are: ANSI S12.10, ANSI S12.54, ANSI S12.55 and

ISO 3445, ISO 3744, ISO 7779.


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The FDM Chambers for Testing Products and Materials


For over seventy years, FDM has been designing and manufacturing laboratory instruments for testing products and materials, with a focus on climatic tests and a wide variety of climatic chamber models.

For further doubts and questions, please do not hesitate to contact us.


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