L.8格/2=4格T=Dx·L/N=10×4/10=4ms F.1/T-1/4ms=250Hz
U.p-p=5V/格×6格=30V U.有效值=30V/(2√2)
C=1000PF×(0.5+0.076)=576 PF D=1.2×0.01=0.012