A Quiet Room does need to be calibrated regularly to ensure that its acoustic performance continues to meet the set standards and needs of the specific application. The main purpose of calibrating a Quiet Room is to verify that its sound insulation and internal noise levels still meet the original design specifications and that it is suitable for accurate acoustic measurements and testing.

Quiet Room Calibration usually includes the following aspects:

Internal Noise Level: Measure the background noise inside the Quiet Room to ensure that it is below a preset threshold, such as 35-40 decibels (dB(A)). This step is to confirm that the Quiet Room provides a low enough noise environment for high-precision acoustic testing.

Sound Isolation: Evaluate the sound insulation ability of the Quiet Room, that is, the degree to which external noise is prevented from entering the Quiet Room. This can be achieved by measuring the difference in sound pressure levels outside and inside, thereby calculating the amount of sound insulation.

Acoustic Uniformity: Noise measurements are made at different locations inside the Quiet Room to confirm that the acoustic performance is uniform throughout the space, without local noise hotspots or dead zones.

Environmental conditions: Record environmental conditions such as temperature and humidity, as these factors may affect acoustic performance.

Ventilation system check: Confirm that the ventilation system does not generate additional noise when in operation, which would affect the background noise level of the quiet room.

Maintenance check: Check the physical integrity of the quiet room, including the condition of the sound-absorbing materials, seals, doors and windows, to ensure that there is no damage or aging that would cause the sound insulation performance to deteriorate.

Reporting and analysis: Organize the measurement data, analyze the results and compare them with previous data or industry standards, and make maintenance or improvement recommendations if necessary.

The calibration cycle of the quiet room depends on the frequency of use, environmental conditions, and the design of the quiet room itself. Frequently used quiet rooms may require shorter calibration cycles to ensure the stability of their performance. Calibration work is usually performed by technicians or engineers with acoustic expertise, using professional acoustic measurement equipment.