How to check power supply

Discussion in 'General Electronics Chat' started by dukeman, Jan 22, 2013.

  1. dukeman

    Thread Starter Member

    Feb 7, 2009
    13
    0
    Hi,
    I would appreciate if someone can show me where I can information on how to properly check a power supply. My power supply has neutral, line, floating ground, + and - connections. How should I make connections to find out whether it is good or bad with a dmm?

    Thanks in advance for your help.

    Dukeman
     
  2. bug13

    Well-Known Member

    Feb 13, 2012
    1,208
    38
    My first thought: read the manual

    + and - is a good bet, neutral and line looks like something need to be caution with.
     
  3. sheldons

    Active Member

    Oct 26, 2011
    616
    101
    on the output side of the power supply choose a diode,connect your dmm to its cathode (red lead) and your black lead to any ground on the seconday side and set your meter to read voltage (select a high range voltage wise and work your way down-if your meter is auto ranging you dont need to do this)
    If its a smps and you are using the primary side ground to check secondary voltages you wont get a meaningful reading.dont connect any test equipment(scope etc)which requires a mains earth connection without use of an isolation transformer or there will be a bang
     
  4. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    4,769
    969
    First.. question if this is really something you should really be doing.

    Assuming this is a regular AC to DC converter, then line and neutral are the "AC" input side, + and - are the "DC" output side. Put a cord/plug on the AC and measure the DC with your meter.
     
  5. MKCheruvu

    Member

    Nov 20, 2012
    30
    6
    Conclued on Data like: the Expected Supply Voltage-(min/Max) and Current(max) it can deliver.
    What do you want to check on the power supply. : Just OK/not ok
    or Specifications.
     
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