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Small/Cheap Galvanometer Needed

  1. May 7, 2009 #1

    Physicist

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    Hello,

    I'm doing an experiment and need a small and cheap galvanometer. Does anyone know where can I find it?

    Regards
     
    Physicist, May 7, 2009
  2. jcsd
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  3. May 7, 2009 #2

    The Electrician

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    What do you actually need to measure? A small current or a small voltage? What magnitude?

    Does the instrument need to be a ballistic galvanometer, or would a short time constant be ok?
     
    The Electrician, May 7, 2009
  4. May 7, 2009 #3

    Physicist

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    A need to detect small currents and indicating the direction of them.

    Any galvanometer would be ok.
     
    Physicist, May 7, 2009
  5. May 7, 2009 #4

    The Electrician

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    How small? A milliampere? A microampere? A nanoampere? A picoampere?
     
    The Electrician, May 7, 2009
  6. May 7, 2009 #5

    Physicist

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    I meant small = small in size (not the range).
     
    Physicist, May 7, 2009
  7. May 7, 2009 #6

    The Electrician

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    You said "A need to detect small currents and indicating the direction of them."

    That's "small currents", which has nothing to do with the physical size of the instrument.

    How small are the currents you need to detect?
     
    The Electrician, May 7, 2009
  8. May 8, 2009 #7

    Physicist

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    microamps or even milliamps would be OK as I can vary the other components.
     
    Physicist, May 8, 2009
  9. May 8, 2009 #8

    The Electrician

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    The Electrician, May 8, 2009
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