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Sound power measurement software
DS-0231
To DS-2000 Multi-Channel Data Station
Basic Terms for FFT Analysis
Sound power level is an amount of sound energy which is radiated by the sound source passing in a unit time. Measuring the sound power enables to clarify the sound characteristics of sound source.

The needs for measurement of sound power level have long been well established in Europe. Especially at the companies which are exporting products (office equipment, home appliance etc.) to Europe have been actively involved in measurement of the sound power level relatively early date. Also, manufacturers of construction machinery and off-road engine etc. have been working toward the introduction of this measurement method one after another recently.

Measurement methods are generally classified into two categories, the determinations of sound power levels by using sound pressure and the determination of sound power levels by using sound intensity method. The former is the method to assume the sound power level by measuring the average of sound pressure around the sound source. In the latter method, the sound intensity is measured. Both measuring methods are prescribed in ISO and JIS standards.

Particularly in the determination of sound power levels using sound pressure method, simultaneous measurements at multi points of sound pressure can be performed in short time by using multiple microphones.

Follows are comparison table of features for each of “determination of sound power levels by using sound pressure” and “determination of sound power levels by using sound intensity”.

 
Comparison item Determinations of sound power levels
by using sound pressure method		 Determination of sound power levels
by using sound intensity method
Frequency range 100 Hz to 10 kHz 50 Hz to 6.3 kHz
Measurable physical quantity Sound pressure Sound intensity
Applicable ISO ISO 3741 to 3746 ISO 9614-1 and 2
Applicable JIS JIS Z 8732 to 8734 JIS Z 8736-1 and 2
Measurement environment Anechoic chamber, semi-anechoic chamber, and reverberation chamber General environment
Advantage Simultaneous measurements by using multiple microphones can be performed. Can be measured in short time. Measurement can be performed without special facility for sound insulation or sound proof.
Generally required only one set of SI probe.
Disadvantage The elaborate facilities such as anechoic chamber, semi-anechoic chamber, and reverberation chamber are required in order to measure with minimum background noise. Measurement jig including traverse equipment should be setup in the chamber. Using one probe takes long time for multipoint or moving measurements.

 

Features

  • Using the DS-0231 measurement system with a B5-size notebook type PC holds down the weight at 7 kg or less in total. That compact measurement system gives full play on-site and visiting measurements. Off course, high performance desktop type PC can be used with. You can also prepare the report at the site.

  • The DS-0231 covers measurement methods which are prescribed in ISO and JIS standards such as the measurements at semi-anechoic chamber, reverberation chamber and general field.

  • The number of microphones can be selected from 1 to 32 so that it can support from low-cost system using a few microphones to a large scale system with multiple microphones.

  • The combination with MI-1233 microphone and MI-3110 preamplifier enables simple configuration without requiring external microphone amplifier.

  • This measurement/analysis software does not take much time in order to learn with Windows-based simple operation.

  • Operation near the measurement object can be performed by the system without cooling fan.

  • Storing the measured and analyzed data in one folder makes it easy and reliable to have backup.

  • Measured and analyzed data can be printed out in a list format.

 

System configuration

Illustration (System configuration)

 

  Model / Name Q’ty
1 DS-2100 Main unit 1
2 DS-0264 Input unit for 4-ch 3
3 DS-0271A Signal output module for 1-ch (built in DS-2100 main unit) 1
4 DS-0290 AC power supply unit 1
5 DS-0297 ONO-LINK II: Communication module to connect DS-2100 main unit and PC 1
6 AX-9023 Cable for DS-0297A (2m) 1
7 PC (Please refer to [Specifications] (2) for details of PC requirements.) 1
8 DS-0231 Sound power level measurement software by using sound pressure method 1
9 MI-1234 1/2-inch microphone 10
10 MI-3110 Microphone preamplifier with CCLD 10
11 SC-3100A Sound calibrator (piston-phone type) 1

※ Coaxial cable with BCD connectors is used as connection cable between microphone and DS-2000 main unit. Dimension and length of each cable can be selected.

 

Specifications

(1) Analysis unit (Assembled with No.1 to 6 listed above)

Outer dimensions 257(W) × 134(H) × 182(D) mm
Weight Approx. 5 kg
Power supply 12 VDC or 100 VAC
Power consumption 50 W or less
Input connector Directly connecting to MI-3110

 

(2) PC requirements (notebook type) (No.7 listed above)

CPU Pentium II 400 MHz or more
Memory 128 MB or more
HDD 4GB or more available space is required.
I/F PCMCIA TYPE II or PCI Bus is required for connecting to the DS-2100 main unit. USB connector or parallel port is required for protection key.
OS Windows 2000, XP, Vista

 

(3) Sound power level measurement software by using sound pressure method (No.8 listed above)

Analysis method 1/1 or 1/3 real time octave analysis method
Analysis item Sound power level (sound power level with A-weighting, band sound power level), averaged sound pressure level, exponential coefficient
Measurable frequency range 25 Hz to 20 kHz (1/3 octave center frequency)
Calibration function Sound pressure sensitivity
Measurement point 32 points max. (arbitrary setup from 1 point)
Measurement result Graph and numerical display of sound power level

 

(4) Microphone system (Assembled with No.9 to 11 listed above.)

Microphone 1/2–inch microphone
Intrinsic noise: 19 dB, 130 dB
Sound pressure: 130 dB max.
Wide range of frequency from 20 Hz to 20 kHz
Preamplifier Microphone preamplifier with CCLD
Current: 2 mA to 20 mA
Output connector: BNC
Piston-phone Output sound pressure level:124 dB（250 Hz）
Outer dimensions 34(W) × 39(H) × 118(D) mm
Weight: 320 g

 

Applications for sound power level measurement

Automobile Industry Home appliance / office automation equipment industry
  1. Sound power level measurement of the engine itself
  2. Sound power level measurement of the transmission itself
  1. Sound power level measurement of fax, photo copy machine and printer
  2. Sound power level measurement of FDD, HDD and CD-ROM
  3. Sound power level measurement of fan and fan motor.
  4. Sound power level measurement of air conditioner
  5. Sound power level measurement of compressor
  6. Sound power level measurement of boiler and jug for household use
Industrial machinery field  
  1. Sound power level measurement of general machine tool
  2. Sound power level measurement of semiconductor manufacturing equipment
  3. Sound power level measurement of generator
  4. Sound power level measurement of constructing machines
  5. Sound power level measurement of medical equipments
  

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Revised: 2009/07/31

● Descriptions and specifications are subject to change without prior notice.
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