BAI TAP DO LUONG DIEN CO LOI GIAI

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DO LUO NG Dil;N
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CHUONG I: DO Dl�N AP VA DONG DI�N
1.1

tro

MQt arnpe-ke dung cd cau do tll di$n c6 di$n
cd cau do 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 trong 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 do 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) 1 �

Vm = I m.Rm= O,OSrnA.99Q = 4,95rnV
4 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

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