要在(zai)待測(ce)(ce)物上仿真電(dian)(dian)(dian)(dian)(dian)子(zi)負載(zai)(zai)(zai)的瞬時變化，主要問題在(zai)于(yu)何時及如何起動電(dian)(dian)(dian)(dian)(dian)子(zi)負載(zai)(zai)(zai)抑制電(dian)(dian)(dian)(dian)(dian)流(liu)至待測(ce)(ce)物。可藉由設(she)定開始(shi)加載(zai)(zai)(zai)電(dian)(dian)(dian)(dian)(dian)壓Von來解決這些(xie)問題。當電(dian)(dian)(dian)(dian)(dian)子(zi)負載(zai)(zai)(zai)為LOAD ON且(qie)輸入(ru)電(dian)(dian)(dian)(dian)(dian)壓超過(guo)Von 時，開始(shi)加載(zai)(zai)(zai)電(dian)(dian)(dian)(dian)(dian)流(liu);但在(zai)電(dian)(dian)(dian)(dian)(dian)子(zi)負載(zai)(zai)(zai)為LOAD OFF或輸入(ru)電(dian)(dian)(dian)(dian)(dian)壓低于(yu)Von時停止(zhi)加載(zai)(zai)(zai)。參(can)閱圖(tu) 1 和圖(tu) 2 的開始(shi)和停止(zhi)加載(zai)(zai)(zai)電(dian)(dian)(dian)(dian)(dian)流(liu)。

圖1 開(kai)始抑(yi)制電流 (Von Latch off)

圖2 停(ting)止抑制電流 (Von Latch off)

　　Von Latch 有(you)兩個操作模式(shi)：鎖定(ding)(ding)與非(fei)鎖定(ding)(ding)。鎖定(ding)(ding)表示當電(dian)(dian)壓(ya)超過Von 時(shi)，電(dian)(dian)子(zi)負載(zai)(zai)會(hui)開始加(jia)載(zai)(zai)電(dian)(dian)流并持續下去而不管輸入電(dian)(dian)壓(ya)壓(ya)降是否(fou)低于Von。非(fei)鎖定(ding)(ding)表示當電(dian)(dian)壓(ya)低于Von 時(shi)，電(dian)(dian)子(zi)負載(zai)(zai)會(hui)停止(zhi)加(jia)載(zai)(zai)電(dian)(dian)流。Von電(dian)(dian)壓(ya)和操作模式(shi)可于SYS中(zhong)設定(ding)(ding)。