What is Reverberant Testing?
testing measures the sound made by a piece of equipment. Reverberant
rooms are constructed with reflective materials that allows us
to measure only the sound created by the equipment. The Energistic's
room is constructed to the ANSI S1.2 standard.
Two types of tests are performed in reverberation rooms. They
measure "radiated" and "discharge" sound
levels. In a radiated test, the ducts connected to the terminal
device are wrapped, preventing any sound from escaping. Therefore,
the sound level measurements in the radiated test reflect only
the sound emitted from the terminal device. In a discharge test,
the terminal device is placed outside the room in order to measure
the level of discharge sound that would be created by the terminal
When is Reverberant Testing Used?
Reverberant testing is typically
used by manufacturers as a way to compare a product's sound power
level to industry standards. Reverberant testing may also be
used to compare the noise level of different products under the
same conditions. This information allows for a parity comparison
of noise levels among several pieces of similar equipment.
At Energistics, we primarily test terminal equipment, including
variable air volume boxes, fan-powered boxes, grilles, registers
and diffusers. Our testing measures the level of noise created
by these terminal units. Typically, a product is tested at several
different octave bands - usually within a frequency range of
125 to 8,000 hertz, the bands commonly recognized by the human
Successful Reverberation Room Testing
There are several components
to a successful reverberant room test. First, the test product
must be constructed exactly as it will be in production. Second,
the testing setup must be constructed according to industry standards.
These standards specify setup of the test instrumentation that
must be used and the specific setup of the room. Finally, the
instruments must be calibrated immediately prior to the test,
and no noise may pervade the test space. If any of these requirements
are not met, the test cannot be considered valid. Should the
equipment run louder than the manufacturer's specification, Energistics
has the ability to work with the product manufacturer to improve
the equipment's performance.
Mockup Room Testing