Parameter testing in the sound level meter calibration, such as frequency weighting and linearity, needs precise adjustment of sound level in the decibel (dB) unit. In the previous calibration setup, a hardware-based sound attenuator instrument was used as the complementary to a signal generator instrument system where the adjustment of sound using the attenuator was performed manually by the operator. By this manual adjustment, frequency weighting and linearity parameter testing need a sufficiently long time to finish. This paper presents the development of software for an attenuator system and the automation of frequency weighting and linearity parameter testing process without additional hardware-based attenuator instrument in the calibration setup. The developed software attenuator system has attenuation range from 0 to 99 dB and a resolution of 0.01 dB. The calibration time efficiency can be improved by the automation of frequency weighting and the linearity testing process built within the software.

中文翻译：

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用于自动声级计校准的分贝步进式衰减器的开发

声级计校准中的参数测试，例如频率加权和线性度，需要以分贝（dB）单位精确调整声级。在以前的校准设置中，基于硬件的声音衰减器仪器被用作信号发生器仪器系统的补充，在信号发生器仪器系统中，由操作员手动执行使用衰减器的声音调节。通过这种手动调整，频率加权和线性参数测试需要足够长的时间才能完成。本文介绍了用于衰减器系统的软件的开发以及频率加权和线性参数测试过程的自动化，无需在校准设置中使用其他基于硬件的衰减器仪器。开发的软件衰减器系统的衰减范围为0至99 dB，分辨率为0.01 dB。通过软件中内置的频率加权自动化和线性测试过程，可以提高校准时间的效率。