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The centrepiece of the sound chamber is a semi-anechoic room with a usable volume of 8.4 m x 6.4 m x 5.2 m. It is located in a 35 to 40 cm thick concrete cube that guarantees a maximum background sound pressure level of 15 db(A) and is lined with approx. 40 cm thick rockwool and fibreglass and 45 cm wedge absorbers. These ensure freedom of reflection in a frequency range of 100 Hz to 12,000 Hz. The entire concrete cube, weighing just under 450 tons, was placed on springs to prevent any disruptive vibrations affecting the floor. The room therefore provides ideal conditions to test and optimise the acoustics of the quietest units. The sound chamber is certified for measurements in accordance with ISO 3745.

 

Sound intensity measurements to determine sound power levels in accordance with ISO 9614 or sound location are also carried out under these conditions in addition to sound power level measurements in accordance with ISO 3744 to 3746.

 

Speeds, vibrations, electrical measurements etc. are recorded at the same time in addition to sound pressures, depending on the requirements. All of the measuring systems used are mobile and can also be used for on-site measurements if required.

 

The sound chamber can be rented for use with your own measuring systems.

 

Click here to contact the FEC.

 

 

Move the cursor over the image and find out more about the test setup shown.

 

 

Measuring technology	12 channel Orchestra measuring system 10 microphones (class 1) Sound intensity probe 300 W hemispherical loudspeakers Various vibration sensors Two laser speed sensors
Test chamber	Semi-anechoic room, certified in accordance with ISO 3745
Usable size	8.4 x 6.4 x 5.2 m (L x W x H)
Weight	approx. 450 t, spring mounted
Door size	4,5 x 4,0 m
Floor	As a raised floor (can also be removed), height 0.8 m Thickness of wedges 45 cm Insulation 40 cm
Frequency range	100 Hz to 12.5 kHz
Sound power level	in accordance with DIN EN ISO 3744, 3745, 3746, ISO 9614 1-3
Background sound pressure level	Guaranteed background sound pressure level 15 dB(A)

  

 

 

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