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发表于 8-10-2012 09:08:00
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长安先生 发表于 4-10-2012 16:25 
还需要吗,要是还要就翻译一下,请回复
你好,还有如下两段需要您这边帮助
2.1 Three free-field microphones with appropriate signal conditioning and cables, meeting class 1 accuracy corresponding to IEC 651 or equivalent for the application (precision ± 0.7 dB or ± 8%) shall be used.
5.1.1稳态窄带数据。 For each voltage, process the fuel pump noise data to calculate the A-Weighted sound pressure level in dB relative to 20 μPa versus frequency. Also, calculate the acceleration vector magnitude for each tri-axial accelerometer at each frequency line. The acceleration vector magnitude is equal to the square root of the sum of the squares of the individual tri-axial responses as follows:
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