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一、直流電子負載任(ren)務
電(dian)(dian)(dian)(dian)子(zi)負載用于(yu)測(ce)(ce)試(shi)直(zhi)流(liu)(liu)(liu)穩壓(ya)(ya)電(dian)(dian)(dian)(dian)源、蓄電(dian)(dian)(dian)(dian)池等電(dian)(dian)(dian)(dian)源的(de)性(xing)能(neng)。設計和制作一(yi)臺(tai)電(dian)(dian)(dian)(dian)子(zi)負載，有恒(heng)(heng)流(liu)(liu)(liu)和恒(heng)(heng)壓(ya)(ya)兩種模式(shi)，可手動(dong)切換。恒(heng)(heng)流(liu)(liu)(liu)方式(shi)時要求不(bu)論輸入電(dian)(dian)(dian)(dian)壓(ya)(ya)如何變化(在一(yi)定(ding)范圍(wei)內)，流(liu)(liu)(liu)過(guo)(guo)該電(dian)(dian)(dian)(dian)子(zi)負載的(de)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)恒(heng)(heng)定(ding)，且電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)值可設定(ding)。工作于(yu)恒(heng)(heng)壓(ya)(ya)方式(shi)時，電(dian)(dian)(dian)(dian)子(zi)負載端(duan)電(dian)(dian)(dian)(dian)壓(ya)(ya)保持恒(heng)(heng)定(ding)，且可設定(ding)，流(liu)(liu)(liu)入電(dian)(dian)(dian)(dian)子(zi)負載的(de)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)隨被(bei)測(ce)(ce)直(zhi)流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)源的(de)電(dian)(dian)(dian)(dian)壓(ya)(ya)變化而變化。圖中限流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)阻(zu)取0.5Ω～1Ω，≥10W，以(yi)防電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)過(guo)(guo)大損(sun)壞被(bei)測(ce)(ce)電(dian)(dian)(dian)(dian)路。被(bei)測(ce)(ce)電(dian)(dian)(dian)(dian)源使用橋式(shi)整流(liu)(liu)(liu)和電(dian)(dian)(dian)(dian)容濾(lv)波構成(cheng)(cheng)，濾(lv)波電(dian)(dian)(dian)(dian)容容量總和不(bu)超過(guo)(guo)2200uF，以(yi)測(ce)(ce)量電(dian)(dian)(dian)(dian)子(zi)負載在應對含有脈動(dong)成(cheng)(cheng)分的(de)電(dian)(dian)(dian)(dian)壓(ya)(ya)信號時的(de)穩定(ding)性(xing)。
二、直流電子負載要求
1、基(ji)本(ben)要(yao)求：
(1)恒(heng)壓(ya)(ya)模(mo)式下電子負載端(duan)電壓(ya)(ya)Uo 可設定(ding)，范(fan)圍：0~10V;以(yi)0.1V 為步進并顯示設定(ding)電壓(ya)(ya);電流能力(li)≥2.0A。電壓(ya)(ya)誤差≤5%。
(2)恒(heng)流(liu)模式下(xia)電子負載流(liu)入電流(liu)Io 可設定，范圍：0~2.0A;以0.01A 為步進(jin)并顯示(shi)設定電流(liu)。誤差(cha)≤10%。
2、發揮部分
(1)電壓模式下(xia)能以(yi)1KHz 切換負載的接(jie)入和斷(duan)開，1KHz 時鐘源自制。
(2)恒壓方式下以(yi)0.01V 為步進并顯示設定電(dian)(dian)壓，電(dian)(dian)流能力≥3.0A。電(dian)(dian)壓誤(wu)差≤1%。
(3)恒流(liu)方式下可設定電流(liu)范圍0~，步(bu)進0.01A，電流(liu)誤差(cha)≤5%。
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