Bai Tap KT Do Luong
B mn K thut o v Tin hc Cng nghip
Bi tp K thut o lng
Bi 1: Mt thit b o c thang o cc i 100(A, c sai s tng i quy i (1%.
Tnh cc gii hn trn v gii hn di ca dng cn o v sai s theo phn trm
trong php o i vi :
a. lch cc i.
b. 0,5 lch cc i.
c. 0,1 lch cc i.
Bi 2: Mt thit b o c thang o cc i 100(A, c sai s tng i quy i (3%.
Hy tnh sai s kh d khi dng c ch :
a. 50(A.
b. 10(A.
Bi 3: Dng 25(A o c dng c c thang o cc i 38(A. Nu phi o 25(A chnh
xc trong khong (5%. Hy tnh chnh xc cn thit ca dng c o.
Bi 4: o 13 ln mt gi tr in p U vi chnh xc nh nhau bng in th k mt
chiu. Xc nh khong ng tin, cho trc xc sut ng tin P = 0,98. Cho
kst(13 im o) = 2,72.
n
1
2
3
4
5
6
7
8
9
10
11
12
13
U(V)
100,05
100,04
100,06
100,02
99,99
100,05
100,02
100,04
99,99
100,01
100,04
100,04
100,01
Bi 5:
Mt thit b o di chuyn c khc nh sau
Di chuyn (X) -(m
10
20
30
40
50
60
Ch s (Nx)
200
100
67
50
40
33
a. Lp s quan h gia di chuyn v s ch th bng phng php th.
b. Lc o ta c kt qu ch th 85,86,85,84,86,85,84,83. Hy gia cng kt
qu o lng: xc nh di chuyn, sai s. Bit p= 98% h s student =3,0.
Bi 6:
Cho mt miliampemet t in, c thang chia 150vch. Gi tr chia
CI=0.2mA/vch. in tr c cu o Rcc=2(.
V s mch Ampemet v tnh cc gi tr in tr R1, R2, R3 mc ni tip to
thnh cc in tr Sun cho 3 gii hn o dng in 5A, 10A v 15A
Bi 7:
V s v tnh gi tr cc in tr R1,R2,R3 mc ni tip to thnh cc Sun ca
miliampemet chnh lu c 3 gii hn o 1mA,10mA, v 100mA. Ch th l c cu in
c Iccmax= 0.3mA; Rcc= 350(. in p lch thang o ng vi gii hn o nh nht
Un= 0.27V
Bi 8:
Xc nh khong o in tr ca Ommet ni tip c cc ch k thut sau:
- in p cung cp U0= 3V; in tr ph ni tip Rp= 30k(; in tr iu chnh 0
RM=50( ni song song vi cc c cu ch th : Ictmax= 50(A, ngng nhy
(=1(A
- V s Ommet v tnh cc Rx tng ng vi cc dng in sau:
Ict= 1/2Ictmax; Ict= 3/4Ictmax
Bi 9:
Mt Ampemet c ba khong o 5A, 2.5A, 1A. Chia thnh 100 vch, cp chnh
xc 1.
1/ t vo thang o 5A o dng in, kim ch 18 vch
a/ Xc nh gi tr ca dng in
b/ Tnh sai s tng i ca php o
2/ Chn thang o thch hp, xc nh s vch m kim ch th, tnh sai s
mi
Bi 10:
1/Lp s kim tra Cng t v cc bc kim tra Cng t
2/ Trong s cng t c cc thng s sau: 5A -220V; hng s cng t 1100
vng/kWh.
Voltmet c khong o 0-250V 100 vch
Ampemet c khong o 0-5A 100vch chia
Wattmet c khong o 0-1500W 150 vch chia
Tnh ton cc gi tr I,U,P trong bng kt qu th nghim sau:
Uvch
88
88
88
88
88
Ivch
20
40
60
80
100
Pvch
22
44
66
88
110
Nvng
5
5
10
10
10
t giy
68,1
34
45,2
34
27,2
3/ Tnh sai s cc gi tr khc nhau ca P
4/ Lp quan h (=F(P) bng th
Bi 11:
Sau mt thng cng t ca mt trm bin th quay 125.000 vng, vi hng s
cng t 600vng/kWh.
Cng t c ni qua bin in p c: ku= 15.000/100 v bin dng ki=100/5
Tnh s tin phi tr, bit gi in nng l 300/kWh
Cng t phn khng quay 100.000vng . Tnh h s cos( . Tnh tin in phi
tr vi gi in sau:
cos( >0.8Gi in 400/kWh
0.7
