1.
RS = Rintangan pendarab
RM = Rintangan dalam meter d'Arsonval
Fungsi rintangan pendarab : a)melanjutkan
julat voltan meter
b)Menghadkan arus melalui meter kepada arus pesongan skala
2.
RM = 100 ; V = 10v ; ISP = 0.0001A
Kepekaan,s = 1/ISP
= 1/0.0001A
= 10000
RS = S x julat -
RM
= 10000 x 10 - 100
= 99.99 k #
3.
RM = Rintangan dalam
meter d'Arsonval
RSH = Rintangan
pirau
Rintangan pirau digunakan sebagai laluan lain bagi arus yang diukur.
4.RSH(ISH)
= RMIM
(100 - 0.0001)RSH
= (105)(0.0001)
RSH =0.0105/99.9999
= 0.105 m #
atau
n = I / IM
= 100 / 0.0001
= 1000k
RSH = RM
/ n-1
= 10.5 / 10000k - 1
= 0.105m #
5 .
Meter ampere jenis Ayrton
6.RM = 1k ,
IM = 0.00005 A
a )Pada julat A4, RSH
= 1 + 9 + 90 + 900
= 1000
RM / n-1 = RSH
n = 2
n = IM / I4
= 0.000025 A
b )Pada julat A3, RSH
= 100 , RM = 1900
A3(100) = 0.00005(1900)
A3 = 0.00005(19)
= 0.95mA
c )Pada julat A2 , RSH
= 10 , RM = 1990
A2 = 0.000005(1990) / 10
= 9.95mA
7.
R1 = S x julat x
RM
= 20k x 1 -
1000
= 19k #
R2 = S x julat -
RM
= 20k x 10
- 1000
= 199k #
R3 = S x julat -
RM
= 20k x 1000
- 1000
= 1999k #
8.a ) i ) - RSH
digunakan untuk menambahkan aliran melalui D1 semasa
separuh penuh
kitar positif supaya lengkungan ciri
diod lebih lurus
- Diod
D2 berfungsi atau terpincang balikan pada separuh
kitaran positif dan hampir
tiada kesan pada litar. Dan semasa kitar
negatif, diod D2 terpincang depan dan menghasilkan
laluan lain bagi arus pincang balikan
yang akan mengalir melalui meter dan diod D1.
ii) S = 2.5k , RM
= 150 , Ifsd = 0.0001 A , VIN
= 10 Vrms
ISH = RM(Ifsd)
/ RSH
Vpurata = 0.45(Vrms)
= 0.45 x 10
= 45v
RT = Sau x julat
= 2.5k(10)
= 25k #
IT = 1 / Sau
= 0.45 / 2.5k
= 0.00018 A
ISH = It - IM
= 0.00018 - 0.0001
= 0.00008 A
RSH = 150(0.0001) / 0.00008
= 187.5 #
b )Dengan meter , Sau
= 2.5k , RM = 150 , Julat = 10 Vrms
RTA = Sau x julat
= 2.5k x 10
= 25k
RR = Rb // RTA
= (10 x 25) / 35
= 7.143k
Bacaan meter volt , VRB
= E(RE) / (Ra + Re)
= 10 (7.143k) / 5k + 7.143k
= 5.9v #
9. Ifsd = 1mA
, RM = 100 , RDL
= 400 , Julat = 100 Vrms ,
RSH = 100
i ) ISH =
RM(Ifsd) / RSH
= 100(1m)/100
=1mA
IT = ISH
+ IM
= 2mA
RT = EAT
/ IT
EAT = 0.9(Vpmkd)
= 0.9(10)
= 9
maka; RT
= 9 / 2mA
= 4.5k
RT = RS
+ RD + RM // RSH
RS = RT
- (RD + RM // RSH)
= 4.5k - (200
+ (100 x 100) / 200
= 4.5k - 250
= 4.25k #
ii ) Sau =
RT / julat
= 4.5k / 10
= 450
Sat
= Sau / 0.9
= 450 / 0.9
= 500
10.i ) Rz
= E / ISP - RM - RS
= 3 / 0.00005 - 1000 - 2000
= 60k - 3k
= 57k #
ii ) Pada 25%
; Rx = 57k + 3k / 0.25 - 60k
= 180k #
Pada 75% ; RX
= 57k + 3k / 0.75 - 60
= 20k #
iii ) RX
pada 50% skala penuh ;
RX = RZ + RM /
p - (RZ + RM)
= 60/0.5 - 60
= 120 - 60
= 60
maka didapati RX
= Rmeter pada separuh skala penuh.