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Assignment

Title: Design of conventional multi range voltmeter and ammeter

          

In this assignment, will experience on how to design a conventional instrument and how to carry out the analysis and validation about their designs. The assignment could need knowledge from circuit theory or digital logic design.

Assignment objective:

• This assignment is for instrument circuit design and analysis.
• The deadline of the assignment is on 20 DEC 2012

Assignment regulation:

• Design the project according to the specifications given .
• Follow the assignment schedule plan strictly.

Assessment scheme:

you are required to design ONE multi range voltmeter and ONE multi range ammeter by using a D’Arsonval meter with a full-scale deflection rating of 1mA and the internal coil resistance, R_in. The measurement range of the voltmeter should cover the ranges as shown below.

	Voltmeter	Ammeter
1)	0-1V	0-10mA
2)	0-5V	0-50mA
3)	0-10V	0-100mA
4)	0-20V	0-1A
5)	0-50V	0-10A
6)	0-100V	0-20A
7)	0-200V	0-50A
8)	0-300V	0-60A
9)	0-400V	0-80A
10)	0-500V	0-100A

The students are required to

i)        Propose the circuit for the multi range voltmeter and ammeter.

ii)      Choose the internal coil resistance, R_in according to the last THREE digits of your ID number.

i.e. ID: 123456789, R_in = 789 Ω  

iii)    Determine the suitable multiplier and shunt resistance for the multi range voltmeter and ammeter.

iv)    Determine the limiting error of each individual measurement range, if each of the multiplier and shunt resistors added has 10% limiting error. 

Report:

After completing the assignment, a project report should be submitted by each group. The quality of the report is as important as the quality of your design. In the report, the following information must be included:

a)      Objectives.

b)      Theory.

c)      Functional explanation of the voltmeter and ammeter.

d)     Design and circuit diagram of the voltmeter and ammeter.

e)      Calculations of the suitable multiplier and shunt resistances.

f)       Calculations of the limiting error of each measurement range.

g)      Analysis and discussion.

h)      Conclusion

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