Connect with us

Checking Continuity of Potentiometers

Discussion in 'Electronic Basics' started by bassplayer, Sep 13, 2005.

Scroll to continue with content
  1. bassplayer

    bassplayer Guest

    I'm trying to check the continuity of some potentiometers that I have.
    These pots are 250K and when I test them, the only time I get any valid
    reading > 0 ohms is when I have the pot turned all the way until it
    stops. Should I be getting readings as the resistance increases, such
    as 57K, 60K, 100K, 175K, 200K, 243K, 250K (each value being displayed
    as I turn the knob)??
  2. If you measure from an end terminal to the center (wiper) terminal,
    you should see a smooth change in resistance as you turn the shaft.
    If you measure between the two outside terminals, you should see a
    fixed resistance, regardless of shaft position. You have to be using
    an ohm meter range high enough to tell that resistance from an open

  3. The resistance between the end terminals should be 250K, regardless of
    the position of the wiper.

    The resistance between the wiper and either end should vary
    continuously between 0 and 250K as you adjust the pot.
  4. As others have said, yes, between the wiper and one end. Do these
    pots have integral switches, and are you measuring across one end of
    the pot and the switch?

    Mark L. Fergerson
  5. Jasen Betts

    Jasen Betts Guest

    yes, typically.
    if these pots have three terminals the outer two should show a fixed
    resistance and the middle one shold vary its resistance between the two end

    If you have semi-logarythmic pots (marked 250K-A or A250K or "LOG" etc )
    most of the resistance change will be at one end of the turning
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day