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一(yi)、直流電子負載任務
電(dian)(dian)(dian)子(zi)負(fu)載用于(yu)測(ce)(ce)試直流(liu)(liu)穩(wen)壓(ya)電(dian)(dian)(dian)源(yuan)、蓄電(dian)(dian)(dian)池等電(dian)(dian)(dian)源(yuan)的性(xing)能(neng)。設計和(he)(he)制作一(yi)臺電(dian)(dian)(dian)子(zi)負(fu)載，有恒(heng)(heng)流(liu)(liu)和(he)(he)恒(heng)(heng)壓(ya)兩(liang)種(zhong)模式(shi)，可手動切(qie)換。恒(heng)(heng)流(liu)(liu)方式(shi)時要求不(bu)論輸入電(dian)(dian)(dian)壓(ya)如何變(bian)(bian)化(在(zai)一(yi)定(ding)范圍內)，流(liu)(liu)過該電(dian)(dian)(dian)子(zi)負(fu)載的電(dian)(dian)(dian)流(liu)(liu)恒(heng)(heng)定(ding)，且電(dian)(dian)(dian)流(liu)(liu)值可設定(ding)。工作于(yu)恒(heng)(heng)壓(ya)方式(shi)時，電(dian)(dian)(dian)子(zi)負(fu)載端(duan)電(dian)(dian)(dian)壓(ya)保持恒(heng)(heng)定(ding)，且可設定(ding)，流(liu)(liu)入電(dian)(dian)(dian)子(zi)負(fu)載的電(dian)(dian)(dian)流(liu)(liu)隨被測(ce)(ce)直流(liu)(liu)電(dian)(dian)(dian)源(yuan)的電(dian)(dian)(dian)壓(ya)變(bian)(bian)化而(er)變(bian)(bian)化。圖中(zhong)限流(liu)(liu)電(dian)(dian)(dian)阻取0.5Ω～1Ω，≥10W，以防電(dian)(dian)(dian)流(liu)(liu)過大損壞被測(ce)(ce)電(dian)(dian)(dian)路(lu)。被測(ce)(ce)電(dian)(dian)(dian)源(yuan)使(shi)用橋式(shi)整(zheng)流(liu)(liu)和(he)(he)電(dian)(dian)(dian)容濾波構成，濾波電(dian)(dian)(dian)容容量總和(he)(he)不(bu)超過2200uF，以測(ce)(ce)量電(dian)(dian)(dian)子(zi)負(fu)載在(zai)應對含有脈動成分的電(dian)(dian)(dian)壓(ya)信號時的穩(wen)定(ding)性(xing)。
二、直流電子負載要求
1、基本要求：
(1)恒(heng)壓模式(shi)下電(dian)子負(fu)載端電(dian)壓Uo 可(ke)設定，范圍：0~10V;以0.1V 為(wei)步進并顯示設定電(dian)壓;電(dian)流能力(li)≥2.0A。電(dian)壓誤差≤5%。
(2)恒流(liu)模式(shi)下電子負載流(liu)入電流(liu)Io 可設定(ding)，范圍(wei)：0~2.0A;以0.01A 為步(bu)進(jin)并顯示設定(ding)電流(liu)。誤差≤10%。
2、發揮(hui)部分
(1)電(dian)壓模式下能以1KHz 切(qie)換負(fu)載的(de)接入和(he)斷開，1KHz 時鐘源自制。
(2)恒壓方式下以0.01V 為步進并顯(xian)示設定電(dian)(dian)壓，電(dian)(dian)流(liu)能力≥3.0A。電(dian)(dian)壓誤(wu)差≤1%。
(3)恒流方式下可設定電流范圍0~，步進0.01A，電流誤(wu)差(cha)≤5%。
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