DS-2040CA Digital Oscilloscope: 1.DC-40MHz,dual channel color display 2.1GS/s real sample,50GS/s equivalent 3.w/ ... , delayAcquisition modesAuto, normal, singleTrigger sourcesCH1, CH2, Ext, Ext/5, Ext(50Ω)Horizontal accuracy ±0.01%Vertical sensitivity2 mV/div to 5V ... /divVertical resolution8bitMax. input voltage400V(DC+AC peak),5Vrms@50ΩAuto measurements Vpp, Vamp, Vrms, Vmin, Vtop,Vbase,Vbase, ...