Reed switch CR measurement circuit

Discussion in 'Embedded Systems and Microcontrollers' started by freemanantony, Aug 22, 2014.

  1. freemanantony

    Thread Starter New Member

    May 28, 2011
    9
    0
    Hello every body,
    i am doing a project for testing reed switches. For measuring Contact Resistance of Reed Switch i am using the circuit which is attached with this post. But with this circuit hardly i can differentiate between 48 milliohms and 36millohms because the measured voltage when Switch is closed is too close to differentiate . So does anyone know any other circuit so this problem can be avoided
     
  2. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    8,740
    759
    Why do you need a voltage limiting resistor ?

    Try removing that resistor.
     
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