Sometimes we need to monitor noise levels on an ongoing level and make longer measurements sub-divided by shorter measurement durations such as 5 minutes, 15 minutes or 1 hour.

有时候，我们需要不断监测水平的噪音水平，使子长测量由测量持续时间较短的划分，如5分钟，15分钟或1小时。

youdao

According to error analysis of sound level measurement and practical case some objection was raised to levy standard on Noise Exceeding Environment standard.

依据声级测量的误差分析，结合实例，对国家现行《超标环境噪声排污费征收标准》提出异议。

youdao

At last, correction method of low level signal measurement is discussed duo to effect of spectrum analyzer floor noise.

最后，讨论了频谱仪本地噪声对低电平信号测量影响的修正方法。

youdao