4-20ma output signal

Discussion in 'General Electronics Chat' started by switchback, Aug 19, 2009.

  1. switchback

    Thread Starter New Member

    Aug 19, 2009
    we are always needing our fluke meter to source in a 4-20 ma signal for different applications while troubleshooting problems. we only have 1 meter. Is it possible someone could tell me how to turn a 24 vdc power supply into a variable 4-20 ma signal.
  2. FastEddie

    Active Member

    Jul 14, 2007
  3. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    Perhaps a simple analog solution such as attached - conceptual only. Might need to be more complex to provide protection etc.

    Do you need galvanic isolation?

    What are your required specifications, such as maximum loop resistance etc?
  4. switchback

    Thread Starter New Member

    Aug 19, 2009
    Looks good! did you purchase the parts and build it yourself. if so do you have a parts list. I am not an electronics expert but, If I have part numbers and a print like you provided me I can build it. I guess not so much the individual components because they are on the print but, maybe a board # to build it on
  5. peranders

    Well-Known Member

    May 21, 2007
    You could also use a plain lab PS and put a resistor in series and possibly use the current limit set to a low value just for protection.