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Harrison Labs 6207A DC power supply

Discussion in 'Electronic Equipment' started by Lenny, Oct 18, 2004.

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  1. Lenny

    Lenny Guest

    I found this unit at the local landfill and it has an output, however
    the panel meter which doubles as a voltage or current indicator
    depending upon which front panel switch you push in, does not indicate
    anything. Does anyone have a schematic for this power supply or do you
    know by chance if anything in particular on the rear terminal strip
    needs to be strapped for a on board reading? Thanks very much for any
    assistance. Lenny Stein, Barlen Electronics.
  2. Robert Baer

    Robert Baer Guest

    I do not know of any commercial PS that requires jumpering to get a
    front panel meter to work.
    Take the case off and check the wiring and most especially, the switch
    (corroded, maybe).
    Also it does not hurt to check the meter with a battery and series
    resistor (no power = PS unplugged).
    Assume 100uAFS and set current to near 50uA; if 1mAFS you will still
    see some deflection.
  3. Lenny

    Lenny Guest

    I did look for voltage across the meter when the voltage switch was
    pushed in and there was none. I also worked the switches but I
    suppose they could have bad contacts. I haven't tried cleaning them
    though. I just wish I had a schematic to follow the traces. I'm
    assuming that the meter when in voltage mode electrically sits across
    the output but I can't really tell how the switch switches the meter
    to voltage mode. Lenny.
  4. I got some HP PS schematics from Ed Matsuda for a very reasonable price.
    His email is at, and the part before the at sign is
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