After a white noise signal has been taken as the input of a standard sound source, a static acoustic test is conducted for a prototype silencer without air flow and at the normal temperature.
采用白噪声信号作为标准声源的输入信号，在常温无气流条件下对消声器实物模型进行了静态放声试验。
This speciality standard will give a go-ahead for using as the reference of the cold and room-temperature microwave noise standard source below 3dB ultra-low-noise received system.
本标准批准后即作为噪声系数3分贝以下低噪声精密测试时的“冷热源”专业技术标准。
This speciality standard will give a go-ahead for using as the reference of the cold and room-temperature microwave noise standard source below 3dB ultra-low-noise received system.
本标准批准后即作为噪声系数3分贝以下低噪声精密测试时的“冷热源”专业技术标准。
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