Test with a multimeter

Lab power supply

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Now: Output off: chassis ground to the minus terminal (Ω)

R CircuVanta 6000 counts · auto range DCAUTO•)))HOLDFUSE− HOLD LIGHT OFFV⎓V~Ω•)))FmA⎓ mA400 mACOMVΩ Positive output (+) 1 + Minus output (−) 2 − Chassis ground 3 PE
Pin 1: Positive output (+) (+) Pin 2: Minus output (−) (−) Pin 3: Chassis ground (PE)

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 output of a lab power supply should give the voltage you set. Measure the output with the multimeter, and measure it under load too, because if the current limit is too low the voltage collapses under load. The output floats: the case ground is not connected to the output.

Set the supply with the output off first, then turn it on. Don't connect the polarity in reverse; don't touch the mains side of the supply.

  1. 1Output off: chassis ground to the negative terminal (Ω)
  2. 2Turn the output on, set 12 V: no load
  3. 3Connect a load at the same setting