Download fakulti kejuruteraan elektrik

Faculty
FACULTY OF ELECTRICAL ENGINEERING
Semakan
:2
Nama Matapelajaran : MAKMAL KEJ. ELEKTRIK
Tarikh Keluaran
: Julai 2008
Pindaan Terakhir
: 2005
Kod Matapelajaran
: SEE 2742
No. Prosedur
: PK-UTM-FKE-(O)-10
SEE 2742
FAKULTI KEJURUTERAAN ELEKTRIK
UNIVERSITI TEKNOLOGI MALAYSIA
KAMPUS SKUDAI
JOHOR
ELECTROTECHNIC LABORATORY
SERIES AND PARALLEL RESONANCE
CIRCUIT CHARACTERISTICS
(Experiment 1)
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1
FAKULTI KEJURUTERAAN ELEKTRIK
UNIVERSITI TEKNOLOGI MALAYSIA
ELECTROTECHNIC LABORATORY
EXPERIMENT : 1-A
TITLE
1.
: MEASUREMENT OF SERIES RESONANCE CHARACTERISTICS
Aims:
i.
ii.
2.
Equipments:
i.
ii.
iii.
iv.
v.
3.
To investigate series resonance characteristics
To identify resonant parameters
Signal generator
Volt meter
Decade inductor (L)
Decade capacitor (C)
Decade resistor (R)
Figure 1.0 shows a series resonance circuit connection.
Figure 1.0
4.
Equations for resonance circuit.
i.
Resonance occurs in the circuit when: Inductive reactance = Capacitive reactance.
2
ωo L =
Therefore,
1
ωoC
where, ωo = 2πf◦
fo = resonance frequency in Hz
ii.
Resonance frequency in terms of L and C ,
fo =
iii.
2π LC
Hz
Selectivity factor, Q
Q=
iv.
1
ω0 L
R
or Q =
1
ω0C
Resonance characteristics
(a)
Voltage supply, R, L, and C are constant, f varies, therefore
Q=
fo
f 2 − f1
where, fo is the resonance frequency.
(b)
Voltage supply, R, L and f are constant, C varies, therefore
Q=
Co
C 2 − C1
where, Co is the value of capacitance when resonance occurs
3
Figure 2.0
5.
Procedure:
i.
Connect the circuit as shown in Figure 1.0.
ii.
Set the values of L = 5mH and C = 0.14 μF.
iii.
Set the value of R according to the signal generator model (OSC).You can
use either of the signal generator listed below :
No Type/Model of Signal Generator Set the value of R to :
1
Jupiter 500
35 ohm
2
Kenwood
50 ohm
3
Trio
50 ohm
4
Levell TG 152DM
0 ohm
iv.
Fixed the frequency at 10 kHz and set L = 4mH. Varies the value of C
from 0.02 μF to 0.14 μF in step of 0.01 μF and record the voltage reading
V2 as in the Table 1.0. Voltage V1 has to be adjusted so that the value is
fixed at 0.5 volt.
4
EXPERIMENT
TITLE
1.
: MEASUREMENT OF PARALLEL RESONANCE CHARACTERISTICS
Aims:
iii.
iv.
2.
To investigate parallel resonance characteristics
To identify resonant parameters.
Equipments:
vi.
vii.
viii.
ix.
x.
3.
:1-B
Signal generator
Volt meter
Decade inductor (L)
Decade capacitor (C)
Decade resistor (R)
Figure 3.0 shows a parallel resonance circuit connection.
I1
10 Ω
A
I2
A
Osc
f = (3 – 10) kHz
10 kΩ
Figure 3.0
5.
Equations for resonance circuit.
v.
Resonance occurs in the circuit when: Inductive reactance = Capacitive reactance.
Therefore,
ωo L =
1
ωoC
where, ωo = 2πf◦
fo = resonance frequency in Hz
5
5 mH
100 nF
vi.
Resonance frequency in terms of L and C ,
1
fo =
Hz
2π LC
vii.
Selectivity factor, Q
Q = ω o CR or Q =
viii.
R
ωo L
Resonance characteristics
(b)
Voltage supply, R, L, and C are constant, f varies, therefore
Q=
fo
f 2 − f1
where, fo is the resonance frequency.
(b)
Voltage supply, R, L and f are constant, C varies, therefore
Co
C 2 − C1
where, Co is the value of capacitance when resonance occurs
Q=
Figure 4.0
6
5.
Procedure:
i.
Connect the circuit as shown in Figure 4.0.
ii.
Set the values of L = 5mH and C = 100 nF.
iii.
Select the sinusoidal waveform from the signal generator output. Set the
amplitude so that the reading of ammeter I1 is constant at 1mA. Record the
reading of ammeter I1 and I2 for the frequencies range between 3 kHz to
10 kHz as in Table 2.0.
7