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BSWA Sound Power Testing Solutions can be downloaded now

2021-08-06
BSWA Company Introduction

Established in 1998, BSWA Technology Co., Ltd. is becoming the preferred supplier for acoustical measurements. With headquarter located in Beijing, BSWA currently employs 100 staffs with branch offices in Shanghai, Guangzhou, and Chengdu. BSWA’s products are distributed in over 40 countries through our sales partners.
BSWA Products cover a full range of acoustic measurement devices. The products are sorted into easy-to-follow sections:

    · Microphones
    · Micrphone Arrays
    · Sound level meter
    · Measuring systems
    · Material testing
    · Audio testing
    · Outdoor monitoring systems
    · Sound sources

    ·Cable and accessories


BSWA Sound Power Testing System Introduction 

In the measurement of sound power level according to ISO 3745-2003, the 20 measurement positions are required on a spherical measurement surface enveloping a noise source in anechoic and hemi-anechoic room. However, it is difficult to mount 20 microphones on tripods in a spherical surface.

BSWA Sound Power Testing System Consists of

    · Fixture and Microphones
    · Data Acquisition Instrument(10-channel DAQ MC38102 OR 20-channel DAQ MC38200)

    · Software(PC、VA-Lab10 BASIC+VA-Lab10 Power OR PowerVA-Lab20 BASIC+VA-Lab20 Power)


BSWA Microphones

BSWA engineers have accumulated 30 years of experiences in making measurement microphones. Each microphone was handcrafted to exacting its high qualities, reliabilities, and extreme stabilities in all kinds of environments.
BSWA micorphones range from 1/1 inch to 1/4 inch in diameter. Among them the MPA231 (or MPA271 with TEDS) 1/2’’ ICCP(ICCP = Integrated Constant Current Power) microphone is for critical applications where high accuracy and low noise are required; The MPA 4*6 series 1/4’’ ICCP microphones are the most cost-effective models for array use. The phases of the microphones are matched according to the customer’s specifications.

BSWA Microphones Specifications



BSWA Microphone Spherical Surface Fixture for Sound Power Testing MF710/MF720


BSWA MF720 is designed according to ISO 3745-2003 to mount 20 microphones over the spherical surface; MF710 is a 10 positions version according to ISO3745; ISO7779 and GB6882.

MF720/ MF710 main features

    · 20 / 10 microphone positions
    · The position and orientation of each microphone can be adjusted to fit the amendment of the ISO standards
    · Portable with light weight and the parts can be disassembled for easy transportation


MF720/ MF710 Specifications

Data Acquisition Instrument

MC38102

BSWA 10-channel data acquisition instrument MC38102 is with 10-channel inputs and 2-channel outputs. It is based on USD NI PXI system. The instrument includes an NI PXI1033 Chassis, 2 PXI 4462 cards, and 1 PXI4461
card.
MC38102 is of 24 bit accuracy; 204.8 kHz sampling rate; BNC connector; inner noises below 20dBA.
User needs to inform the computer type in advance, to decide the connector from the instrument to PC or to Laptop.

MC38200
BSWA 20-channel instrument MC38200 is with 5 PCI slots and contains bus controller and power adapter; It is with cooling fan system of low background noise; Express Card 8360 interface is used to connect to the laptop; with NI 4498 and 4462 card.


VA-Lab Software

VA-Lab is acoustical measurement software developed by BSWA. VA-Lab takes the advantage of computer power and performs all signal analysis within the computer. With BSWA Data Acquisition Hardware and Microphones, VA-Lab represents the most cost-effective solution for all your needs in acoustic measurement and analysis.
VA-Lab is developed based on the international standards and BSWA’s experiences in acoustics. These experiences cover environmental, architectural, material and industrial measurements. VA-Lab has module design with special applications according to ISO standard requirements, such as Sound Power, Sound Insulation, and Impedance Measurements.


VA-Lab Sound Power Module

In order to determine the sound power level produced by the noise source, one method is to measure the sound pressure level on the measurement surface enveloping a noise source. VA-Lab Power module is specially designed to satisfy sound power level test according to ISO3745. With NI Compact DAQ and BSWA microphones, the noise level can be tested simultaneously in 10 channels; the sound power level is calculated automatically based on the measurement surface area. With microphone conditioning unit MC104 (MC1010 is 10 channel version), the background noise can be below 20 dBA for some critical measurements.


Typical Complete Setup for Measurement of Sound Power



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