Download SEE 4077 - FKE UTM

Fakulti:
FAKULTI KEJURUTERAAN ELEKTRIK
Nama Matapelajaran: MAKMAL
KEJURUTERAAN
ELEKTRIK
Kod Matapelajaran : SEI/SEM 4722
Semakan
Tarikh Keluaran
Pindaan Terakhir
No. Prosedur
:1
: 3 July 2007
: 3 July 2007
: MI-UTM-FKE-(6)-10
SEI/SEM 4722
FAKULTI KEJURUTERAAN ELEKTRIK
UNIVERSITI TEKNOLOGI MALAYSIA
KAMPUS SKUDAI
JOHOR
INSTRUMENTATION LABORATORY
STUDENT PACK
6) Wheatstone Bridge Measurements
Disediakan oleh
Nama
Disahkan oleh
Nama
: Ketua Jabatan
: PM Dr. Yahaya Bin Md Sam
Tandatangan
Cop
:
: Dr. Sallehuddin Bin
Ibrahim & Hj.
Mohamad Shukri Abd.
Manaf
:
:
Tandatangan
Cop
:
:
Tarikh
: 3 July 2007
Tarikh
: 1 July 2008
1.
Problem/Project Guide:
The most accurate way to measure this change in resistance is by using the Wheatstone
bridge. This is a balanced electrical circuit which displays any change on an indicator or
feeds it into a process. The Wheatstone bridge, is often used to measure resistance. These
instruments are usually portable because they require only a small, dc source to power the
bridge, which is easily obtained from flashlight batteries. In those cases where an external
supply voltage is desirable for the operation of the bridge, use the minimum voltage that will
give a reliable indication by the galvanometer. Increasing the supply voltage any further
results in uncompensated thermal variations and decreased bridge accuracy. If greater bridge
sensitivity is needed, use a galvanometer with greater sensitivity.
(a) Problem-objectives
-
Study the uses of a Wheatstone Bridge by using different type of resistor
Calibrate the circuit for testing a balances Wheatstone bridge
To obtain a relationship for impedance changes to each side of a Wheatstone Bridge for
the unbalance condition.
To obtain a mathematical equation for the responses.
convert the generated voltage to a Human Readable Form.
Development an experiment to determine the sensitivity of a Wheatstone Bridge.
(b) Problem-solving Time-line
Activities
1. Understanding/identify
2. Design/simulation/experiments
4.Testing/measurement
5.Demo/report writing
Week 1
Week 2
Week 3
Week 4
(c) Report Writing
Your report may include the information here. For example,
Other then the general guide specified by the Laboratory Coordinator, your report for this laboratory must
also include
 Review and circuit diagrams
 Data and graph as a results
 Photographs of the actual circuit construction
 Photographs of your group members
(d) Keywords and questions That Can Help You Tackle The Problem
i. Hysteresis
ii. Repeatability
iii. Range
iv. Sensitivity
v. Quarter, half and full Wheatstone bridges
How does the supply voltage affect the accuracy of Wheatstone bridge measurements?
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2.
Equipments list:
Include links or information to manuals or other resources. For example,
(a) Digiac 1750
(b) Multimeter
(c) Digital display meter and controller, IMP23119
(d) Osciloscope
(a) DC Voltage Supply
(b) Resistor wirewound, slider and carbon.
3.
Components list: Examples as follows,
(c) Connector
(d) Jumper wire, wire
4.
Softwares: Examples as follows
(a) Matlab
(b) Microsoft Excell
5.
Additional resources:
Materials related to the problem/project. Can be technical papers, short manual on how to use Matlab/Simulink or
other software for a particular problem/project, links to websites etc. Examples as follows,
(a) E Journals Handbooks for sensors
(b) http://www.tpub.com/neets/book21/88a.htm
6.
References:
Typically books with specific page numbers on the theoretical background (we don’t want to burden our students
too much since time is limited) or journal/conference papers if relevant. Examples as follows,
(a) Instructions manuals of voltmeter and ammeter
(b) Manual Digiac 1750 Manuals
(c) Electrical Measurement and Instrumentation Module
(d) IMP23119 manuals
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