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Zero adjust resistance help please?

  1. Jan 13, 2015 #1
    • Member warned about using template for posts in the Homework Sections of PF.
    hello there i kinda need help with this, image attached in the thread
    this is the ohmmmeter circuit and i have two questions :
    -what is the effect of R2 when it become lower than Rm?
    -what is the effect of R2 when it become higher than Rm?

    Rm=internal resistance of ohm-meter
    R2=zero adjust resistance

    edit:i study computer engineering techniques and this is the instrument and measurements
    so hopefully this is the right place to post
     

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    Last edited: Jan 13, 2015
  2. jcsd
  3. Jan 13, 2015 #2

    gneill

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    Staff: Mentor

    In your figure the bottom end of R2 is connected to the node where E and Rm connect, but the "wire" looks more sketchy than the other wires of the drawing. Is that connection intentional?

    You need to make an attempt at a solution before we can offer any detailed help. Here's a hint though: You've identified R2 as a zero adjust resistance. What's the standard procedure for zero-adjusting an ohmmeter? Think about comparing the magnitudes of the currents passing through the meter Rm and R2.
     
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