2023年最新的金屬檢測儀品牌榜發布了,一起來看下本次發布的榜單的品牌數據情況吧。金屬檢測儀十大品牌排行榜,此次榜單共收集了金屬檢測儀行業超過18個品牌信息及4145個網友的投(tou)票做為(wei)參考(kao),發(fa)布的品牌榜(bang)(bang)單由CNPP大數(shu)(shu)據平臺提供(gong)數(shu)(shu)據支持,綜合分析了(le)金屬檢測儀(yi)行(xing)業品牌的知名(ming)度、員工數(shu)(shu)量、企業資產規模與經營情況等各(ge)項實力(li)數(shu)(shu)據,發(fa)布了(le)本榜(bang)(bang)單數(shu)(shu)據,僅供(gong)方便用戶找(zhao)到好的品牌參考(kao)使用,具體榜(bang)(bang)單請按(an)最新(xin)更新(xin)數(shu)(shu)據為(wei)準(zhun)。
手持(chi)式金屬(shu)探(tan)(tan)(tan)測器被設計用來探(tan)(tan)(tan)測人或物(wu)體攜帶的金屬(shu)物(wu),廣泛應(ying)用于安全檢查、考古(gu)、探(tan)(tan)(tan)礦(kuang)等方面。手持(chi)金屬(shu)探(tan)(tan)(tan)測器的結(jie)構(gou)主要由四部分組(zu)成:
1、高頻振蕩器
由三極管VT1和高頻變壓(ya)器(qi)(qi)T1等組成,是一種變壓(ya)器(qi)(qi)反(fan)饋型LC振蕩器(qi)(qi)。
2、振蕩檢(jian)測器
振(zhen)(zhen)蕩檢測器(qi)(qi)(qi)由(you)(you)(you)三(san)極(ji)(ji)管(guan)(guan)開關電(dian)(dian)路(lu)和濾(lv)波(bo)電(dian)(dian)路(lu)組(zu)成(cheng)。開關電(dian)(dian)路(lu)由(you)(you)(you)三(san)極(ji)(ji)管(guan)(guan)VT2、二(er)(er)極(ji)(ji)管(guan)(guan)VD2等(deng)組(zu)成(cheng),濾(lv)波(bo)電(dian)(dian)路(lu)由(you)(you)(you)濾(lv)波(bo)電(dian)(dian)阻器(qi)(qi)(qi)R3,濾(lv)波(bo)電(dian)(dian)容器(qi)(qi)(qi)C2、C3和C4組(zu)成(cheng)。在(zai)開關電(dian)(dian)路(lu)中(zhong),VT2的(de)基(ji)極(ji)(ji)與次級線圈L2的(de)“C”端(duan)相連(lian),當高(gao)頻振(zhen)(zhen)蕩器(qi)(qi)(qi)工(gong)(gong)作時(shi)(shi),經高(gao)頻變(bian)壓器(qi)(qi)(qi)T1耦合(he)過(guo)(guo)來的(de)振(zhen)(zhen)蕩信(xin)號(hao)(hao),正(zheng)半周(zhou)使VT2導通(tong),VT2集電(dian)(dian)極(ji)(ji)輸(shu)出負脈沖信(xin)號(hao)(hao),經過(guo)(guo)π型(xing)RC濾(lv)波(bo)器(qi)(qi)(qi),在(zai)負載電(dian)(dian)阻器(qi)(qi)(qi)R4上(shang)輸(shu)出低電(dian)(dian)平(ping)信(xin)號(hao)(hao)。當高(gao)頻振(zhen)(zhen)蕩器(qi)(qi)(qi)停(ting)振(zhen)(zhen)蕩時(shi)(shi),“C”端(duan)無振(zhen)(zhen)蕩信(xin)號(hao)(hao),又由(you)(you)(you)于(yu)二(er)(er)極(ji)(ji)管(guan)(guan)VD2接在(zai)VT2發射(she)極(ji)(ji)與地(di)之間,VT2基(ji)極(ji)(ji)被反向(xiang)偏置(zhi),VT2處于(yu)可靠的(de)截止狀(zhuang)態(tai),VT2集電(dian)(dian)極(ji)(ji)為(wei)高(gao)電(dian)(dian)平(ping),經過(guo)(guo)濾(lv)波(bo)器(qi)(qi)(qi),在(zai)R4上(shang)得到(dao)(dao)高(gao)電(dian)(dian)平(ping)信(xin)號(hao)(hao)。由(you)(you)(you)此可見,當高(gao)頻振(zhen)(zhen)蕩器(qi)(qi)(qi)正(zheng)常工(gong)(gong)作時(shi)(shi),在(zai)R4上(shang)得到(dao)(dao)低電(dian)(dian)平(ping)信(xin)號(hao)(hao),停(ting)振(zhen)(zhen)時(shi)(shi),為(wei)高(gao)電(dian)(dian)平(ping),由(you)(you)(you)此完成(cheng)了對振(zhen)(zhen)蕩器(qi)(qi)(qi)工(gong)(gong)作狀(zhuang)態(tai)的(de)檢測。
3、音頻振蕩器
音頻(pin)振(zhen)(zhen)蕩(dang)(dang)器(qi)(qi)采用互補(bu)型多諧振(zhen)(zhen)蕩(dang)(dang)器(qi)(qi),由三(san)(san)極(ji)(ji)管(guan)VT3、VT4,電阻(zu)器(qi)(qi)R5、R7、R8和電容(rong)器(qi)(qi)C6組(zu)成。互補(bu)型多諧振(zhen)(zhen)蕩(dang)(dang)器(qi)(qi)采用兩只不(bu)同類(lei)型的(de)三(san)(san)極(ji)(ji)管(guan),其中(zhong)VT3為NPN型三(san)(san)極(ji)(ji)管(guan),VT4為PNP型三(san)(san)極(ji)(ji)管(guan),連(lian)接(jie)成互補(bu)的(de)、能(neng)夠強化正反饋(kui)的(de)電路。在電路工作時,它們能(neng)夠交替地進入導通(tong)(tong)和截止狀(zhuang)態,產(chan)生音頻(pin)振(zhen)(zhen)蕩(dang)(dang)。R7既是(shi)(shi)VT3負(fu)載電阻(zu)器(qi)(qi),又是(shi)(shi)VT3導通(tong)(tong)時VT4基極(ji)(ji)限流(liu)電阻(zu)器(qi)(qi)。R8是(shi)(shi) VT4集(ji)電極(ji)(ji)負(fu)載電阻(zu)器(qi)(qi),振(zhen)(zhen)蕩(dang)(dang)脈沖信號由VT4集(ji)電極(ji)(ji)輸出。R5和C6等(deng)是(shi)(shi)反饋(kui)電阻(zu)器(qi)(qi)和電容(rong)器(qi)(qi),其數(shu)值大小影響振(zhen)(zhen)蕩(dang)(dang)頻(pin)率的(de)高低。
4、功率放大器
功率(lv)放(fang)大(da)器由三(san)極管VT5、揚(yang)(yang)聲(sheng)(sheng)器BL等組成(cheng)。從多諧(xie)振蕩器輸出的正脈沖音頻信(xin)號經限流電(dian)阻器R9輸入到(dao)VT5的基極,使其導通(tong),在BL產(chan)生瞬(shun)時較強的電(dian)流,驅(qu)動揚(yang)(yang)聲(sheng)(sheng)器發聲(sheng)(sheng)。由于VT5處于開關(guan)工作狀態,而導通(tong)時間又非(fei)常短(duan),因(yin)此功率(lv)放(fang)大(da)器非(fei)常省電(dian),可(ke)以(yi)利用9V積層電(dian)池供電(dian)。