Sound power measurement software
DS-0231
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
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-1235 1/2-inch microphone | 10 |
| 10 | MI-3111 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
Sound power level measurement of the engine itselfIndustrial machinery field
Sound power level measurement of general machine toolHome appliance / office automation equipment industry
Sound power level measurement of fax, photo copy machine and printer
Sound power level measurement of FDD, HDD and CD-ROM
Sound power level measurement of fan and fan motor.
Sound power level measurement of air conditioner
Sound power level measurement of compressor
Sound power level measurement of boiler and jug for household use
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Revised:2009/07/31
