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voltmeter/ammeter

Discussion in 'General Electronics Discussion' started by pete g, May 20, 2013.

  1. pete g

    pete g

    79
    2
    Sep 14, 2010
    hi all, i'am planning on building a power supply. i;am going to use two meters(analog) for volts and amps. my question is, is the voltmeter hooked up before the ammeter or vice versa? i know the ammeter is hooked in series with output while the voltmeter is in parallel but don't know which comes first.
     
  2. glewis721

    glewis721

    49
    0
    Apr 30, 2013
    how many Ωs does the ammeter have?
    if the resistance is low enough, then it shouldn't matter.
    keep in mine that i am making a guess and dont know if i am right or not.
    you will need follow-up answers
     
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,178
    2,690
    Jan 21, 2010
    If you place the voltmeter after the ammeter, the voltmeter will read the load voltage.

    However, if this is a concern, the ammeter is also going to affect voltage regulation, albeit by a small amount.

    glewis, well spotted, that is the concern -- your guess was pretty good this time ;)
     
  4. pete g

    pete g

    79
    2
    Sep 14, 2010
    hi, the ammeter is 2.5k ohms. i ma. i want to scale it read 100ma, 1a. will the res value cause problems, i would guess yes. how can i overcome those problems short of using another meter.
     
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