【摘要】 通过理论分析，阐述了电子噪声对低声强级声强测量的影响以及相应的预防措施。实验结果表明，只要合理选择传声器对和测量时间，适当提高信噪比，即可有效地抑制电子噪声对低声强级声强测量的影响。因此，声强技术同样适用于微特电机等低噪声声功率级测定。更多还原

【Abstract】 This paper expounds the influence of electrical background noise on low levels sound intensity measurement throughing theory analysing and the relevant preventive measures. The result is that electrical background noise would be no importance in sound intensity measurement at low levels by reasonably choosing typical pressure microphone pairs and the averaging time and suitably increasig the signaltonoise ratio. So the sound intensity technique will be a wide range of applied prospects in the low noise measurement of the small & special electrical machines.更多还原