BAI TAP DO LUONG DIEN CO LOI GIAI

'· ; ,.jl DO LUO NG Dil;N " CHUONG I: DO Dl�N AP VA DONG DI�N 1.1 tro MQt arnpe-ke dung cd cau tll di$n c6 di$n cd cau R(m) = 99Q va dong = lam l�ch t6i da Imax = O,lmA Di�n shunt Rs lQ Tinh dong di�n tong c9ng di qua ampe�ke cac trlt'Q'11g hc;>'p: a) kim 1$ch toi da b) · 0,5Dm; (FSD = Imax, full scale deviation) c) 0,25Dm tro Hinh B.1.1 Giai: a) kim /�ch t6i Dm: Di�n ap hai dau cd cau do: Vm=Im.Rm= O,lmA.99Q=�mV Vm 9,9mV = 9,9mA lsRs= Vm = > Is = Rs= ill riong tong c¢ng: I = Is + I = 9,9 + 0,1 = lOmA I b) O,SDm: Im= 0,5 lmA = 0,05mA O;�C) � Vm = I m.Rm= O,OSrnA.99Q = 4,95rnV 95 = mV = 4.95mA Is = Vm s R ill I= Is + Im= 4.9SmA + O,OSmA=SmA c)0,25mA: Im= 0,25.0;lmA = 0,025mA Vm= ImRrn= 0,025mA.99Q = 2,475mV Trang ;;: O;O 9iY'1'-