Volts and Amp with one Panel Meter

Discussion in 'General Electronics Chat' started by mazur50, Feb 5, 2007.

  1. mazur50

    Thread Starter Member

    Feb 5, 2007
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    I am looking to hook one PM-128 panel meter to my power supply.

    What i would like to do is make the Panel meter read both volts and amps.
    I was also told that this can be done with out a shunt.

    What i want to do is have a switch so i can switch from volt to amps

    I would like to do somthing like this
    http://www.thegmlenterprises.com/id16.html


    thanks
    for the help in advance thanks
    Mike
     
  2. thingmaker3

    Retired Moderator

    May 16, 2005
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  3. mazur50

    Thread Starter Member

    Feb 5, 2007
    28
    0
    Is there any way to do this with out a shunt.

    I currently have a power supply that has a meter like a pm-128 meter with no shunt. But i dont know if the meter is set as a volt meter or not let me know if you have any other idea.

    also thanks for the like i might still do that just looking for other ideas as well.
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
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    What's the magnitude of the voltage and current you need to measure? What is the precision you need to have?
     
  5. mazur50

    Thread Starter Member

    Feb 5, 2007
    28
    0
    I would say no more then 12v and no more then 12amps maybe more like 10amps

    thanks mikes
     
  6. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    A shunt is just a resistor in parallel. It provides a second path for a calculated percentage of the current, therby allowing accurate scaling and protecting the meter movement from overcurrent.

    Is there a particular reason for the "no shunt" requirement in this application?
     
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