0270 标准查询与下载

DIN 45641:1990 声级平均值

This standard defines the mean level of sound events and gives methods for its determination.

Averaging of sound levels

ISO 8798:1987 声学.窄频带屏蔽噪音的参考等级

Acoustics; Reference levels for narrow-band masking noise

ISO 131:1979 声学.空气中声音或噪音的物理量和主观量的表达

Acoustics; Expression of physical and subjective magnitudes of sound or noise in air

DIN 13320:1979 声学.声谱和频谱曲线.概念、表示法

Acoustics; spectra and frequency curves; concepts, representation

Acoustics; spectra and frequency curves, concepts, representation

ISO 266:1975 声学.测量的优选频率

Acoustics; Preferred frequencies for measurements

DIN 1318:1970 声音音量级

Loudness level / Niveau d'isosonieZusammenhang mit der von der ISO herausgegebenen Empfehlung ISO/R 131-1959 siehe Erl?uterungen.

Loudness level

SNV 57610-1949 带杆的六角螺栓，规格g．米制ISO螺纹 M 27 至 M 52

Hexagonal bolts with stem, size g. Metric ISO thread M 27 to M 52