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DC Power Supply PS1503SB

Discussion in 'Power Electronics' started by joseche, Apr 25, 2013.

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  1. joseche


    Jan 4, 2011
    I just purchased the ps1503sbu from VELLEMAN and I have the following question:

    When I turn it ON with nothing connected, shouldn't both LCDs turn ON ?, only the second one turns on which is the one that shows the voltage. The first one (current) is completely dead, which may make sense because I don't have anything connected so there is no current flowing.... but the problem is that I don't have anything with me to connect it to....

    So, if anyone knows this model can you confirm if thats ok ?

    Last edited: Apr 25, 2013
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    I don't know that particular PS, but the behaviour you describe is unusual. Normally the current indicator should at least be lit and show 0 for current. No indication at all is a sign of a defect.

    You can check this as follows:
    - set the current control knob to min.
    - set the voltage control knob to some value, e.g. 2V
    - short circut the output terminals.
    - turn uo the current control knob a little bit.
    The unit now operates a s a constant current source. If the current indicator is working at all, you should now see some current >0A. If not, something is clearly defect.
  3. joseche


    Jan 4, 2011
    yes.... that is what I suspect.... should show at least 0.0
    Thanks !
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