Measuring potentiometer

Discussion in 'General Electronics Chat' started by mrel, Nov 19, 2014.

  1. mrel

    Thread Starter Active Member

    Jan 20, 2009
    97
    1
    Hello
    Can someone explain measuring linear potentiometer.
    Here the story i measuring Linear 5,000 potentiometer using digital multimeter.
    when I set potentiometer to zero than slowly rotate potentiometer to high value i notice the number on the meter jump high and low.
    For some reason cannot get number to go from zero small to big like 10 ohm ,20 ohm ,30 ohm slowly to 5000 ohm ,instead the number jump over the place on the meter.
    mrel
     
  2. ericgibbs

    AAC Fanatic!

    Jan 29, 2010
    2,503
    380
    hi,
    Its very possible the Pot track internal wiper contact is dirty, needs a clean with 'lube'
    Its a common problem with pots
    E
     
  3. wayneh

    Expert

    Sep 9, 2010
    12,126
    3,048
    Connecting the wiper to one end of the pot can help limit the effect of the jumping. When the wiper loses contact with the track, instead of jumping to "infinite" resistance, it jumps to the max resistance of the track.
     
  4. ScottWang

    Moderator

    Aug 23, 2012
    4,855
    767
    Disassembly the pot and using some alcoholic to clean the Carbon resistance.
     
  5. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
    1,066
    Or throw the pot away and get a new one. If a pot has been overloaded (burned spots where the wiper rides on the resistance material), there is no way to rejuvenate it.
     
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