NVLAP Sound Absorption NRC – C423 - Partition

NVLAP Sound Absorption NRC – C423 - Partition

Theory and Practice. In the early 1990’s, we began to treat measurement of products as a minimum requirement of a design process, and as computer modeling tools became available, these were also quickly incorporated in our consulting work. Without both of these measurements, we cannot predict success in design efforts.

With the construction of a major NVLAP Accredited Acoustic Laboratory and the acquisition of millions of dollars in advanced measurement systems for acoustics, we now have over two decades of experience in laboratory product measurement. This measurement experience has taught us the value of measurement as well as it has built up a deep intuitional knowledge of how each area of product performance works, as we have measured many successes and many failures in our lab before the failure becomes institutionalized into a problem product.

NVLAP Sound Absorption NRC – C423 - Ceiling

NVLAP Sound Absorption NRC – C423 - Ceiling

Laboratories. 

In our Acoustical Laboratory, we have four major measurement laboratories:

  • The Anechoic Chamber
  • The Reverberation Test Suite
    • A Source Room (90m3)
    • A Receiving Room (233m3)
    • A Floor Chamber (51 m3)

In these Laboratories, we can measure to ASTM, ISO and other standards, the 4 main measurement standards for:

  • Sound Power and Sound Pressure Level (SP) - Anechoic or Diffuse
  • Sound Transmission Class (STC) - Diffuse
  • Impact Insulation Class (IIC) - Diffuse
  • Sound Absorption (NRC) – Diffuse

We can also perform many kinds of non-standardized testing in any of our laboratories.

Our Laboratories are equipped with one of the first automated testing systems in the United States, the Norsonic 850 Multi-Channel Analyzer. This analyzer is used for all standardized lab testing, and it includes standards for the United States, Europe, and Great Britain. We also have the first Acoustic Camera in consulting lab use in the U.S., the Norsonic 848A, which can be used for source localization studies that could only previously be done via acoustic intensity measurement (which we also provide).

NVLAP CPAP (Sleep Apnea) Sound Power Testing – ISO3745

NVLAP CPAP (Sleep Apnea) Sound Power Testing – ISO3745

Summary. Our Acoustical Labs were designed for acoustic research and testing, and we are one of the only accredited labs in the U.S. with a strong acoustical research mission. We also have the only NVLAP Accredited anechoic chamber in the U.S in a public lab., which received Guinness World Record awards in 2005 and 2013 for being the “Quietest Place on Earth”.

NVLAP Dual Microphone Sound Power Testing – ISO 3741

NVLAP Dual Microphone Sound Power Testing – ISO 3741

Acoustic Laboratory Dimensions.

Receiver Reverberation Chamber (L X W X H) 27’ x 19’ x 16’ [8.2m x 5.8m x 4.9m]
Source Reverberation Chamber (L X W X H) 19’ x 11’ x 14’ [5.8m x 3.5m x 4.4m]
Floor Reverberation Chamber (L X W X H) 18’ x 12’ x 8’ [5.4m x 3.8m x 2.5m]
STC Wall Opening (W x H) 8'-ó” x 8’-ó” [2.5m x 2.5m]
STC/IIC Floor Opening (L x W) 14’-5” x 12'-7” [4.4m x 3.9m]

Anechoic Chamber 12’ x 10’ x 11’-6” clear space wedge tip to tip, 7’-4” clear height above cable floor or reflecting plane (Can be used as a hemi-anechoic or full anechoic chamber)


 

NVLAP Sound Absorption- Impedance Tube – ASTM E1050-12

NVLAP Sound Absorption- Impedance Tube – ASTM E1050-12

Accredited Test Standards for Our Acoustical Laboratory.

STM E90: Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions Frequency Range:80 to 5000 Hz

ASTM E492: Laboratory Measurement of Impact Sound Transmission through Floor-Ceiling Assemblies Using the Tapping Machine

ISO 3744: Determination of Sound Power Levels of Noise Sources – Engineering Methods for Free Field Conditions Over a Reflecting Plane.

ISO 3745: Determination of Sound Power Levels of Noise Sources – Precision Methods for Anechoic and Semi- Anechoic Rooms.

ASTM E336: Measurements of Airborne Sound Insulation in Buildings

ASTM E1007: Field Measurement of Tapping Machine Impact Sound Transmission through Floor-Ceiling Assemblies and Associated Support Structures

ASTM E966: Guide for Field Measurement of Airborne Sound Insulation in Building Facades and Façade Elements

ISO 3741: Determination of Sound Power Levels of Noise Sources – Precision Methods for Broad-Band Sources in Reverberation Rooms

ANSI S12.51: Determination of Sound Power Levels of Noise Sources Using Sound Pressure – Precision Method for Reverberation Rooms

ANSI S12.54: Determination of sound power levels and sound energy levels of noise sources using sound pressure – Engineering methods for an essentially free field over a reflecting plane)

ANSI S12.55: Precision Methods for Determination of Sound Power Levels of Noise Sources in Anechoic and Hemi-Anechoic Rooms

ASTM C423-09 Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method.

 

Custom System Testing

Custom System Testing

Additional Research Laboratories.

STUDIO 1 AUDITORIUM & LAB
This studio lab is used for subjective research, conferences and recording.

STUDIO 2 ACOUSTIC LAB AND STUDIO
This studio lab is used for acoustic research, open plan research and recording.

ACOUSTIC SIMULATION LAB
This lab is designed to create controllable sound fields for testing of acoustic products in situ.

LIGHTING AND HUMAN FACTORS LAB
This lab is designed for photometric testing, color testing, and human factors evaluations.

VISUAL PERFORMANCE LAB
This lab is used to test visual performance in work tasks or other tasks, with fully controllable glare, illuminance, luminance and sample viewing angle.

OPEN PLAN LAB
This lab is used to test and demonstrate acoustical and lighting applications in the open plan office.

VISUAL SIMULATION LAB
This lab is used to demonstrate visual performance under a series of programmable lighting settings of room lighting and portable plug-in lighting.

LIGHTING PROTOTYPING LAB
This lab is used for full-scale prototyping of lighting systems, and it was originally designed for automotive lighting research.