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Wheatstone Bridge

  • 11-10-2010 10:37pm
    #1
    graham77
    Registered Users, Registered Users 2 Posts: 6 ✭


    I have a problem with a project I'm doing for college. I've been given a digital thermometer to build using a wheatstone bridge but only know two resistor values. Variable resistor is 100 ohms at 0*(pt100) so the opposite resistor must be equal. How would I calculate the other two resistors? Input is 10v and max current is 2mA through the variable resistor so as to avoid self heating effect. The module is project based learning or "self learning" so lecturer won't give out too much info. Personally don't think this method works unless you have some basic knowledge in the relevant field.


Comments

  • #2
    paulgray
    Registered Users, Registered Users 2 Posts: 6 ✭paulgray


    if you can get a hold of Principles of electric circuits by thomas l floyd there is a chapter on the wheatstone bridge also check out allaboutcircuits.com another useful resource.


  • #3
    mawk
    Registered Users, Registered Users 2 Posts: 2,738 ✭✭✭mawk


    Sorry, do you have two fixed resistors and a variable resistor too? If so, can't you call the thermistor its known value at 0°c and work out the last?


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