Because of the direct contact between the measuring cell (sample atmosphere) and weighting instrument, the field of the application of conventional measuring devices were restricted strongly.

传统的重量测量仪器由于样品测量环境和测重仪器直接接触，极大的限制了它的应用。

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All kinds of methods measuring noise have been produced and A-weighting sound level is extensively used as a kind of fundamental measure in all of the world.

针对不同环境下的噪声国际上提出了很多评价方法，目前为世界上广泛应用的是以A声级作为基本评价量的评价方法。

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