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Allen Bradley 1769-sdn/B
Allen Bradley 1769-sdn/B 價(jià)格:  元(人民幣) 產(chǎn)地:Allen Bradley 1769-sdn/B
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上架時(shí)間:2021-07-12 16:43:23 瀏覽量:103
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Allen Bradley 1769-sdn/B 

Allen Bradley 1769-sdn/B

因?yàn)镽in的存在,導(dǎo)致反相放大器輸入阻抗低,從而導(dǎo)致反相放大器在工作時(shí)會(huì)對(duì)信號(hào)源產(chǎn)生影響,從而對(duì)放大結(jié)果產(chǎn)生影響,下面我們來講講是怎么對(duì)反相放大器的放大結(jié)果產(chǎn)生影響的?我們常見的信號(hào)源Vin,一般都不是理想的電壓源,它會(huì)有內(nèi)阻,假定上圖的這個(gè)信號(hào)源的內(nèi)阻為Rz,大小為1K.根據(jù)這個(gè)修改下原理圖如下:


如上圖,可明顯的看出,信號(hào)源內(nèi)阻Rz和Rin是串聯(lián)的,根據(jù)反相放大器公式,Vout=-Vin*Rf/(Rz+Rin),可求得結(jié)果為10k/(1k+1k)=5倍,還記得最開始的計(jì)算結(jié)果嗎?放大結(jié)果不是10倍嗎?對(duì),我們預(yù)想的電路是想將輸入信號(hào)放大10倍,而現(xiàn)在的結(jié)果大相徑庭,誤差足足一倍,而且同樣的電路輸入不同內(nèi)阻的信號(hào)源,也就是Vin的內(nèi)阻Rz不同的話,放大結(jié)果還會(huì)不一樣。現(xiàn)在你明白了反相放大器的這個(gè)缺點(diǎn)是怎么產(chǎn)生的了吧?


因運(yùn)放的反相輸入端為0電位,根據(jù)上圖的電流流向,可以很輕松的判斷出輸出Vout為負(fù)電壓,這也就是反相放大器的計(jì)算公式前面有個(gè)負(fù)號(hào)的原因,因?yàn)檩斎腚妷罕环聪嗔恕7聪蚍糯笃鞯墓酵茖?dǎo),很多朋友都分享過,此處不再累述,根據(jù)上圖電流流向也能很輕松的將公式推導(dǎo)出來。

Allen Bradley 1769-sdn/B IPM03A P0904HB 后備AC/DC電源組件
IPM06A CM902WX AC/DC存儲(chǔ)器后備電源組件
FBM201b P0922YH 8通道0-100mV輸入接口組件
FBM201c P0922YJ 8通道0-5V輸入接口組件
FBM201d P0922YK 8通道0-10V輸入接口組件
FBM202 P0926EQ 8通道熱電偶/毫伏輸入接口組件
FBM203 P0914SV 8通道0-320熱電阻輸入接口組件
FBM203b P0922UA 8通道0-640熱電阻輸入接口組件 
FBM203c P0922UD 8通道0-30熱電阻輸入接口組件 
FBM204 P0914SY 8通道0-20mA輸入輸出接口組件 
FBM205 P0914XG 冗余8通道0-20mA輸入/輸出接口組件
FBM206 P0916CQ 8通道脈沖輸入接口組件
FBM207 P0914TD 16通道電壓監(jiān)視輸入接口組件(可選冗余)
FBM207b P0914WH 16通道24Vdc觸點(diǎn)輸入接口組件(可選冗余) 
FBM207c P0917GY 16通道48Vdc觸點(diǎn)輸入接口組件(可選冗余)
FBM208 P0914TB 4通道0-20mA輸入/4通道0-20mA輸出組件
FBM211 P0914TN 16通道0-20mA輸入接口組件 FBM212模塊
FBM213 P0914XL     14通道熱電偶輸入接口組件 FBM213模塊
FBM214 P0914XN     8通道熱電阻輸入接口組件 FBM214模塊
P0914XQ     8通道HART通訊輸入接口組件 
FBM215 P0922VU 8通道HART通訊輸出接口組件 
FBM216 P0922VV 冗余8通道0-20mA/HART輸入接口組件
FBM217 P0914TR 32通道離散量輸入接口組件(可選冗余)
FBM218 P0922VW 冗余8通道0-20mA/HART輸出接口組件 
FBM219 P0916RH 24通道電壓監(jiān)視輸入,8通道離散量輸出接口組件

Allen Bradley 1769-sdn/B 
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