dc power supply question

Discussion in 'General Electronics Chat' started by fdandy, Feb 19, 2011.

  1. fdandy

    Thread Starter New Member

    Feb 19, 2011
    This is my first variable regulated v/a dc power supply. 0-30 v and 0-5amps. Digital meters and fine&course adjustments for both. Im not getting any readings on amps. Seeing how this shouldnt be a switched power supply I would think I wouldnt need a load to adjust amps. Question is shouldnt I be able to adjust amps before hooking anything up? Voltage readings are fine but I get nothing on the amp reading. The unit is brand new. I think its faulty.
  2. russ_hensel

    Distinguished Member

    Jan 11, 2009
    No. Supply can be either voltage controlled or current controlled. To set voltage, leave open circuit and adjust. To set current, short it and adjust current. Think about it.
  3. fdandy

    Thread Starter New Member

    Feb 19, 2011
    Thanks Russ! I hooked up a small dc motor and found that out.
  4. Jaguarjoe

    Active Member

    Apr 7, 2010
    I just added a pushbutton on the face of the panel that shorted the output to set the current limit.