Anechoic chamber offers isolated environment for performing some tests and measurements. On this post, you will find every aspect of anechoic chambers. If you want to contribute to this post, add your comment by using Submit Comment button at the end of this page. 

What is anechoic chamber? 

Let us start checking the definitions of these two words from Cambridge Dictionary:

anechoicnot able to send back an echo (= a sound that reflects off a surface)

chamber: a room used for a special or official purpose, or a group of people who form (part of) a parliament

According to dictionary, we can define anechoic chamber as a room which is not able to send back an echo and used for a special purpose.

More technically, an anechoic chamber is a room designed to completely absorb reflections of either sound or electromagnetic waves. Anechoic chambers are mostly isolated from waves entering from their surroundings.

What are the functions of an anechoic chamber? 

Anechoic chamber has two functions:

* To form a no reflection place

* To form isolated place

An anechoic chamber is used for either acoustic measurements or electromagnatic/RF measurements. Acoustic anechoic chambers do not allow reflection of sound waves inside the chamber and do not allow sound waves coming from outside. Electromagnetic/RF anechoic chambers do not allow reflection of electromagnetic waves inside the chamber and do not allow electromagnetic waves coming from outside. 

Why anechoic chamber is used? 

Main purpose is to create an reflection-free and noise-free test and measurement environment. Performing tests inside an anechoic chamber gives you much more reliable and accurate results when compared to testing outside. 

Acoustic and electromagnetic measurements are the measurements of the strengths of frequencies. But, when performing these measurements, how will you avoid reflections from other objects, interfering signals or noise? You have to use special materials that absorbs unwanted signals and shielding that prevents interfering signals or noise. 

Most of the acoustic, EMC, RF and antenna measurement standards require anechoic chamber to get accurate test results. Anechoic chambers are mostly used for product compliance tests and measurements. The product can be an audio device/component, electronic device/component/system, antenna or any product emits sound or electromagnetic wave. 

Which standards are used for anechoic chambers? 

Some of the anechoic chamber related standards are listed below.

Purpose of Anechoic Chamber

Standard

Acoustics 

ISO 3745

Acoustics 

ISO 3741

Acoustics 

ISO 3744

EMC

CISPR 16-1-4

EMC CISPR 11 / EN 55011
EMC CISPR 14-1 / EN 55014-1
EMC CISPR 14-2 / EN 55014-2
EMC CISPR 24
EMC CISPR 25
EMC CISPR 32
EMC CISPR 35
EMC IEC 60601-1-2 / EN 60601-1-2
EMC ETSI EN 301 489-1
EMC UN ECE R10
EMC MIL-STD-461

The list includes both validation standards for compliance of anechoic chamber and test standards that anechoic chambers are referred. 

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