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AC nodal analysis with a HP 50g, help needed

  1. Mar 15, 2008 #1
    I've got a small issue at hand right now.

    I need to solve simultaneous equations with unknowns in order to do mesh and nodal analysis problems. The issue is, i can't figure out how to enter the equations in to get an answer out. My previous calculator was a t183+, so i'm not that well acquainted with the 50g or HP calculators in general.


    I read "https://www.physicsforums.com/showthread.php?t=190871" [Broken] thread, but can't seem to wrap my head around it.

    The set of equations i'm trying to solve is

    V1(2.5∠-29.9)-V2(0.5∠0)=24∠0
    V1(0.5∠0)-V2(0.539∠21.80)=4∠0

    solving for V1 and V2.

    I'm using RPN mode as mentioned in another thread i found, and for the ∠ symbol i'm using the alpha+Rshift+6 insertion.

    So far i've tried entering the following without success.

    ['X(2.5∠-2.29)-Y(0.5∠0.)=(2.5∠-2.29)']
    ['X(0.5∠-2.29)-Y(0.539∠21.80)=(4.∠0.)']
    {X Y}


    I keep getting "invalid syntax" on the angle symbols when entering the equations, yet when entered as just (2.5∠-29.9) on the stack, they auto-convert to rectangular form.

    I've also tried with the rectangular equivelents like so.

    ['X(2.5,-0.099)-Y(0.5,0.)=(2.5,0.099)'] ENTER
    ['X(0.499∠-1.99)-Y(0.5,0.2)=(4.,0.)'] ENTER
    {X Y} ENTER

    That enters in properly and displays on the stack, but when i use Rshift+NUM.SLV MSLV i get "Bad Argument Type"


    Please let me know what i'm doing wrong, and feel free to ask for any other information or screenshots if needed.
     
    Last edited by a moderator: Apr 23, 2017 at 11:32 AM
  2. jcsd
  3. Mar 16, 2008 #2
    Don't use MSLV or other solvers to solve this type of problem; use the matrix arithmetic capability of the HP50.

    Put on level 2 of the stack:

    [[ 24 ]
    [ 4 ]]

    and on level 1(in polar and degrees mode); read the manual for info on how to enter matrices:

    [[ (2.5∠-29.9) (0.5∠180) ]
    [ (0.5∠0) (0.539∠-158.2) ]]

    Then press the divide key and see (in polar and degrees mode):

    [[ (10.089∠35.570) ]
    [ (5.448∠66.182) ]]

    or in rectangular and degrees mode:

    [[ (8.207,5.869) ]
    [ (2.200,4.984) ]]

    On the HP50 you won't see the double square brackets I've used here for a matrix; it will look more like standard matrix notation.
     
  4. Mar 16, 2008 #3
    Thanks! Didn't know that that was possible.
     
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