MN 921 是一款用(yong)(yong)于(yu)測量麥克風的(de)(de)單(dan)通道電(dian)(dian)(dian)源(yuan)裝置(zhi)。在(zai)(zai)輸(shu)入(ru)(ru) (MIC) 和輸(shu)出(chu) (OUT) 之間連接了一個具有(you)可(ke)(ke)變放(fang)大率(lv)的(de)(de)測量放(fang)大器(qi)(qi)。它將測量信(xin)號的(de)(de)動(dong)(dong)態(tai)(tai)范(fan)圍調(diao)整為以下評估儀(yi)器(qi)(qi)的(de)(de)輸(shu)入(ru)(ru)動(dong)(dong)態(tai)(tai)。此外，它還是電(dian)(dian)(dian)容負載的(de)(de)驅動(dong)(dong)器(qi)(qi)，例如。 G。信(xin)號輸(shu)出(chu)端的(de)(de)長 BNC 電(dian)(dian)(dian)纜。當用(yong)(yong)戶使用(yong)(yong)后面板(ban)上(shang)(shang)(shang)的(de)(de)嵌入(ru)(ru)式開關打(da)開 MN 921 時，前(qian)面板(ban)上(shang)(shang)(shang)的(de)(de)綠(lv)色發光二極(ji)(ji)(ji)管將亮起。這表明內部工(gong)作(zuo)電(dian)(dian)(dian)壓(ya)(ya)可(ke)(ke)用(yong)(yong)。電(dian)(dian)(dian)源(yuan)可(ke)(ke)選擇(ze)由電(dian)(dian)(dian)池(chi)(chi)、蓄電(dian)(dian)(dian)池(chi)(chi)或(huo)主(zhu)電(dian)(dian)(dian)源(yuan)供(gong)電(dian)(dian)(dian)。它為電(dian)(dian)(dian)容式測量麥克風提供(gong)所有(you)必要(yao)的(de)(de)電(dian)(dian)(dian)壓(ya)(ya)（前(qian)置(zhi)放(fang)大器(qi)(qi)、極(ji)(ji)(ji)化和加熱器(qi)(qi)電(dian)(dian)(dian)壓(ya)(ya)）。這些電(dian)(dian)(dian)壓(ya)(ya)是間接耦合(he)的(de)(de)（輸(shu)出(chu)信(xin)號上(shang)(shang)(shang)沒有(you)電(dian)(dian)(dian)源(yuan)嗡嗡聲），并且在(zai)(zai) LEMO 插(cha)座 (MIC) 上(shang)(shang)(shang)可(ke)(ke)用(yong)(yong)。放(fang)大器(qi)(qi)工(gong)作(zuo)電(dian)(dian)(dian)壓(ya)(ya) (120 V) 的(de)(de)輸(shu)出(chu)是防短路的(de)(de)，極(ji)(ji)(ji)化電(dian)(dian)(dian)壓(ya)(ya)控制在(zai)(zai) ± 0.1 V。對于(yu)預極(ji)(ji)(ji)化測量麥克風，可(ke)(ke)以關閉(bi)極(ji)(ji)(ji)化電(dian)(dian)(dian)壓(ya)(ya)。 MN 921 可(ke)(ke)以提供(gong)帶有(you) IEPE 連接（ICP 等）的(de)(de)測量麥克風，與適(shi)配器(qi)(qi) A 92 一起使用(yong)(yong)。A 92 具有(you) LEMO 插(cha)座并適(shi)配 BNC 連接器(qi)(qi)。

膠囊極化(hua)電壓：200 V 可切換(huan)

0.4Hz 至 1MHz

12個加固區