Sound Absorption Measurement 吸聲系數測試
Complied
with試驗方法及宣告標準
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Sound
Absorption Measurement according to ISO 354 [Weighted
Sound Absorption Coefficient (aw)] |
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Sound
Absorption Measurement for road traffic noise reducing devices, road
barrier according to BS EN 1793-1 & 1793-3 (DLa) |
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Sound
Absorption Measurement according to ASTM C423 (SAA
/ NRC) |
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Field
Measurement: Annex
X2 of ASTM C423 [Sound
Absorption Area (A)] |
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根據國家標準
GB/T20247試驗所得的吸聲系數
(as) |
Laboratory
facility實驗室設施
Fo Tan Branch 火炭實驗室 (HOKLAS
Accredited香港認可處所認可之實驗室)
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Location: 地點: |
About
10-minute's walk from Fo Tan MTR station 由火炭港鐵站步行約10分鐘 |
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Room
volume: 測試房容積: |
206m3 |
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Test
standard: 試驗方法: |
ASTM
C423 (SAA
/ NRC) ISO
354 (aw) GB/T20247
(aw) |
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Test
Area 測試件所需面積: |
ASTM
C423 |
≧6
m2 |
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ISO
354 GB/T20247 |
≧10m2 |
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Instrument
測量設備
To
ensure the highest accuracy and precision of our measurement, our
equipment is complied with the requirements of accuracy classes 0 or 1
defined in IEC 651 and IEC 804.
聲壓級測量設備的準確度滿足IEC
651 和
IEC 804中規定的0型或1型准確度要求。
Equipment |
Fulfilled
International Standard
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Real-
Time Frequency Analyzer |
Yes |
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Free-
field Microphone |
Yes |
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Microphone
Preamplifier |
Yes |
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Sound
Level Calibrator |
Yes |
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OmniPower
Sound Source |
Yes |
Test
Arrangement 測試安排
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A
band of random noise is used as a test signal and turned on long
enough for the sound pressure level in the room to reach a steady
state. When
the signal is turn off, the sound pressure level will decrease and
the rate of decay may be determined from measurements of the
average time for the sound pressure level in a specified frequency
band to decay through a certain range. Repeat
the measurement under Empty room and With specimen inside the
reverberation chamber condition. Calculate the sound absorption
coefficient of the test specimen based in the variation of
reverberation time. 分別測量在有和沒有測試件的情況下混響室平均混響時間。 |
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Sound
absorption coefficient
is given by: 測試件吸音量計算方法如下:
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Standard 試驗方法 |
A
single number descriptor 宣告標準 |
Calculation
計算方法
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ISO
354 |
Practical
Sound Absorption Coefficient (ap) |
Arithmetic
mean of three 1/3 octave sound absorption coefficients. |
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Weighted
Sound Absorption Coefficient (aw) |
A
single number frequency-dependent value. |
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Shape
Indicator (L / M / H) |
Practical
sound absorption coefficient ap
exceeds the value of the shifted reference curve by 0.25 or more. |
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ISO
354, BS
EN 1793-1 & 1793-3 |
Sound
Absorption performance (DLa) |
Sound
absorption performance expressed as a difference of A-weighted
sound pressure levels. |
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GB/T
20247 |
Sound
Absorption Coefficient (as) |
Sound
absorption performance |
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ASTM
C423 |
Noise
Reduction Coefficient (NRC) |
Average
of the sound absorption coefficients of a material for 4 octave
bands: 250 Hz, 500 Hz, 1000 Hz and 2000 Hz, inclusive. |
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Sound
Absorption Average (SAA) |
Average
of the sound absorption coefficients of a material for 12 1/3
octave bands from 200 Hz through 2500 Hz, inclusive. |
Certify
Your Buildings Specimen 為產品認證
Once
finished laboratory measurement, a detail report of the measurement, and a
Certification that certified the Weighted Sound Absorption Coefficient (aw
/ DLa ),
Noise
Reduction Coefficient (NRC) or Sound Absorption Average (SAA)
the of the tested buildings specimen will be issued. People can refer to
this Certification to consult the acoustics performance of your building
products. No more estimation, true data is here.
所有的測試件於完成測試後,
均會發出一份具有公信力的測試報告以表示其隔音性能,客戶可以更了解產品的特性。
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Testing
of Absorptive panel 吸音板測試 |
Testing
of Absorptive panel 吸音板測試 |
Testing
of False Ceiling 吸音天花測試 |
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Testing
of Absorptive panel 吸音板測試 |
Testing
of Absorptive panel 吸音板測試 |
Testing
of Wedge 吸音物料測試 |
