Weird symbols in an schematic of non-invasive DC sensor

Discussion in 'The Projects Forum' started by zaukkoo, May 27, 2016.

  1. zaukkoo

    Thread Starter New Member

    May 27, 2016
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    Hi! Does anyone know what these circled symbols represent?
    DC Split Current Sensor Circuit.JPG
     
  2. bertus

    Administrator

    Apr 5, 2008
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    2,348
    Hello,

    The symbols could represent variable resistor / potentiometers.
    The O/S will adjust the offset of the circuit and the F/S will adjust the gain / full scale adjust.

    Bertus
     
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  3. zaukkoo

    Thread Starter New Member

    May 27, 2016
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    Thank you Bertus!
    Are the O/S-potentiometer's two floating connectors connected to the both ends of the hall-sensors core?
    If you want some background of this situation, I am trying to replicate the expensive commercial DC-current sensors using a regular split core AC-sensor (which has nothing but the core and it's connectors) by attaching this circuit to it. This is to aim at a low price, that is essential for our project. Our project is to make affordable measuring systems connected wirelessly to a database, and that to a web based UI.
     
  4. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    It is not a real schematic.
    The details are not given.

    Bertus
     
  5. zaukkoo

    Thread Starter New Member

    May 27, 2016
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    Okay, I think I will order one, open it up and see what it's got inside.
    Thank you very much for your help!
    I am going to keep this thread open, in case someone has more good informed guesses.
     
  6. hp1729

    Well-Known Member

    Nov 23, 2015
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    Could the "+" thing be a resistance bridge sort of thing? A sensor of some sort?
    The "floating ends" of O/S I would expect to go to +15 and -15, but it would show that I would think.
    "Hall Effect sensor"? Is that supposed to be the objective of the device? A LEM or current transformer?
     
  7. zaukkoo

    Thread Starter New Member

    May 27, 2016
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    Yes. It's a Hall Effect DC-current transformer.
     
  8. hp1729

    Well-Known Member

    Nov 23, 2015
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    Which is the Hall Effect device? The O/S pot or the "+" thing? The "+" thing a ratiometric hall effect device, trimmed by the O/S pot? I haven't seen a four leaded such device before, but I guess that doesn't mean much.
     
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