检定声级计有关性能用猝发声的研究

Study on the tone burst used to check the performances of sound levelmeters

在相关标准中,规定检定声级计有关性能用的猝发声必须‘零起零落”。本文通过实验验证指出,猝发声“零起零落”与否,对声级计的检定结果有明显影响,但其差别远小于相应客差的1/10,这一差别对计量检定要求来说是很小的,可忽略不计。因而,在声级计检定中没有必要强调猝发声必须“零起零落”。

It is demanded in the correlative standards that the tone burst, used for inspecting sound level meters, must be '0-on and 0-off'. This paper makes some experimental study on the influence of this requirement. The results show that whether the tone burst is '0-on and 0-off' or not, it will affect the results of check up. However, the difference between the two results is much smaller than 1/10 of the correlative tolerances such that it can be ignored for the inspection purpose. Thus, it seems not necessary to stress that the tone burst must be '0-on and 0-off' in inspecting sound level meters.