HI, i m doing a analog voltmeter design project..I m using the multiplier resistors model..but my group members discovered there is a weakness which is if one of the resistors spoil,the whole model wont work out..so anyone can give me some clue to solve this problem?thx alot...

 

Do you mean that a resistor failure will cause the voltmeter to give erroneous readings? A resistor failure will nearly always cause a circuit to malfunction. Otherwise, there would be no need for the resistor.
Perhaps I don't understand what you mean. Post a schematic, with a description of the resistor problem.

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Ron

 

First,I would like to thank u for ur help.The multiplier diagram is inside the link below.I know wat u mean and thats why i m asking for help how to modify my circuit so that in case if there is one resistor malfunc..Thx
http://openbookproject.net//electricCircuits/DC/DC.pdf

 

The answer is already there - use the previous diagram.

But even the one with the resistors in series is VERY, VERY unlikely to suffer from a resistor failure - and if it does, it's almost certainly because you've seriously abused it, and the meter movement is likely to be destroyed as well.

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Thx alot..but one thing is in the real world we cant get the value of the shunt resistors,so how?

 

Either make them from series/parallel combinations, or have them specially made (expensive!).

Or just use the alternative circuit with the more common values.

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