西門子氣體分析儀-測量頭C79451-A3488-L7使用手冊操作說明
如果被測聲源輻射可聽的離散頻率，選擇高出地面為.6r的測點(diǎn)位置來測定A聲功率級LWA時(shí)將會帶來較大的誤差。在此情況下，測點(diǎn)位置可以位于恰好高于地面的半球表面上。但只有地面是堅(jiān)硬的（如混凝土或?yàn)r青地面）情況下可以這樣放置，測點(diǎn)離地面的距離不大于.5mm，這四個測點(diǎn)的位置如表1右方各欄所示。除需要的反射地面外，傳聲器距其他反射體應(yīng)不小于.5mm。表1沿直角坐標(biāo)系(-X,Y,Z)以離開半球中心O的距離表示的測點(diǎn)坐標(biāo)測點(diǎn)高度為Z=.65r的測點(diǎn)在反射面上的測點(diǎn)X/rY/rZ/rX/rY/rZ/r1.8..61..2..8.6.1.3-.8..6-1...5m4.-.8.6.-1.3.6.2試測對半球測量表面測點(diǎn)位置相對于被測聲源的方位（即坐標(biāo)軸X、Y的方位）需要試測加以確定，即用聲級計(jì)在高度為.6r處沿著距Z軸為.8r的圓形路徑找出A聲級的一點(diǎn)，使該點(diǎn)與4個測點(diǎn)位置之一重合。
西門子氣體分析儀-測量頭C79451-A3488-L7使用手冊操作說明
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