【正文】 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^$UE9wEwZQcUE%amp。gTXRm6X4NGpP$vSTTamp。MuWFA5uxY7JnD6YWRrWwc^vR9CpbK!zn%Mz849Gx^Gjqv^$UE9wEwZQcUE%amp。gTXRm6X4NGpP$vSTTamp。849Gx^Gjqv^$UE9wEwZQcUE%amp。gTXRm6X4NGpP$vSTTamp。MuWFA5uxY7JnD6YWRrWwc^vR9CpbK!zn%Mz849Gx^Gjqv^$UE9wEwZQcUE%amp。gTXRm6X4NGpP$vSTTamp。MuWFA5ux^Gjqv^$UE9wEwZQcUE%amp。gTXRm6X4NGpP$vSTTamp。MuWFA5uxY7JnD6YWRrWwc^vR9CpbK!zn%Mz849Gx^Gjqv^$UE9wEwZQcUE%amp。gTXRm6X4NGpP$vSTTamp。849Gx^Gjqv^$UE9wEwZQcUE%amp。QA9wkxFyeQ^!djsXuyUP2kNXpRWXmAamp。內(nèi)部資料僅供參考9JWKffwvGtYM*Jgamp。（4）監(jiān)視器的畫(huà)面上產(chǎn)生若干條間距相等的豎條干擾，干擾信號(hào)的頻率基本上是行頻的整數(shù)倍。（3）監(jiān)視器上產(chǎn)生較深較亂的大面積網(wǎng)紋干擾，以至圖像全部被破壞，形不成圖像和同步信號(hào)。d、系統(tǒng)附近有很強(qiáng)的干擾源。這里所指的電源不“潔凈”，是指在正常的電源(50周的正弦波)上疊加有干擾信號(hào)。b、視頻線(xiàn)的特性阻抗不是75Ω以及參數(shù)超出規(guī)定也是產(chǎn)生故障的原因之一。這種故障現(xiàn)象產(chǎn)生的原因較多也較復(fù)雜。（2）監(jiān)視器上出現(xiàn)木紋狀的干擾。C、常見(jiàn)的幾種圖象干擾現(xiàn)象及原因：（1）視頻傳輸中，最常見(jiàn)的故障現(xiàn)象表現(xiàn)在監(jiān)視器的畫(huà)面上出現(xiàn)一條黑杠或白杠，并且或向上或向下慢慢滾動(dòng)。所有設(shè)備及外接線(xiàn)路均應(yīng)可靠接地。設(shè)備選擇均為金屬外殼，并保證良好接地。視頻傳輸電纜、攝像機(jī)的電源線(xiàn)和控制線(xiàn)均穿PE管敷設(shè)。系統(tǒng)的電源由低壓配電引出專(zhuān)用回路。B、具體抗干擾措施整個(gè)系統(tǒng)采用單點(diǎn)接地（減少高頻信號(hào)傳入），接地母線(xiàn)采用銅質(zhì)線(xiàn)，為了保證整個(gè)系統(tǒng)采用單點(diǎn)接地，在工程實(shí)施中視頻信號(hào)傳送過(guò)程中每路信號(hào)之間嚴(yán)格隔離，單獨(dú)供電，信號(hào)共地集中在中心機(jī)房。（4）傳輸控制過(guò)程中阻抗匹配。干擾比較強(qiáng)時(shí)最好選用光纖傳輸，控制電纜采用雙層屏蔽電纜，采用金屬外殼，并保證設(shè)備可靠接地。針對(duì)以上原因在設(shè)備安裝布設(shè)就應(yīng)采用響應(yīng)的措施，其主要從以下幾個(gè)方面來(lái)預(yù)防：（1）光電隔離，這主要指設(shè)備制造器件。比較常見(jiàn)的干擾類(lèi)型有以下