DS-18型五位雙積分型數(shù)字電壓表中Us=-6.0000V,fc=0.75MHz,計(jì)數(shù)器滿量程N(yùn)1=60000,求被測(cè)電壓Ux=2.5000V時(shí),計(jì)數(shù)器計(jì)數(shù)值N2為多大?采樣時(shí)間Tl和測(cè)量時(shí)間T2分別為多大?