Test with a multimeter

Trimpot

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Now: Outer terminals: total resistance

CircuVanta 6000 counts · auto range DCAUTO•)))HOLDFUSE− HOLD LIGHT OFFV⎓V~Ω•)))FmA⎓ mA400 mACOMVΩ Terminal 1 1 Wiper (middle) 2 W Terminal 3 3
Pin 1: Terminal 1 (1) Pin 2: Wiper (middle) (W) Pin 3: Terminal 3 (3)

Red probe Not connectedBlack probe Not connected

Hold the probe and drag it to the tip of a leg. Tapping works too: first pick the probe, then the leg.

Set the range to Ω (resistance).

Measure step by step

The two outer ends of a trimpot give the total resistance, and the middle terminal (the wiper) gives the part that changes with the adjustment screw. First measure the total, then turn the screw and measure the two ends. On a multi-turn trimpot you may hear a click when the screw reaches its limit.

  1. 1Outer terminals: total resistance
  2. 2Wiper to end 1: screw in the middle
  3. 3Wiper to end 1: screw at the end