clear
Vka = 6.1
Ika = .003
Ifb = .0002
Iref = .000002
Vnom = 2.495
Zka = .2
Inom = .01
Vref = Vnom + (Ika-Inom)*Zka + (Vka-Vnom)*-.0014
r1 = (Vka-Vref)/Ifb
r2 = Vref/(Ifb-Iref)
