LTSpice AC simulation Fault ?

Discussion in 'General Electronics Chat' started by BastiaanMark, Jan 16, 2019.

  1. BastiaanMark

    Thread Starter New Member

    Dec 9, 2008
    2
    0
    In LTSpice I simulate with AC generator a capacitor 100µF in series with 100 Ohm resistor.
    The simulation Graph Plots Current Through C and Voltage After C in the SAME Phase ?
    In Theory the current should Lead the Voltage over a capacitor.
    Other Simulation programs eg Simetrix and Multisim Do have a 90 Degree Phase difference between Current and Voltage.
    Not in LTSpice !? Why !
     
  2. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    9,210
    2,177
    Welcome to AAC!
    Between which two points are you measuring voltage? Show us your circuit.
     
  3. crutschow

    Expert

    Mar 14, 2008
    20,876
    5,929
    You are likely doing something wrong.
    Post the .asc file.
     
  4. kubeek

    Expert

    Sep 20, 2005
    5,389
    1,021
    Wow, congrats to your first post after 10 years of being here :)
    Note that when you measure current in a component, you will see an arrow that shows which way is positive. You could have your resistor "backwards" from the way the simulator shows it, and it will show the current 180° out of phase in AC simulation, or negative in DC and transient.
     
  5. BastiaanMark

    Thread Starter New Member

    Dec 9, 2008
    2
    0
    Thanks for Reply !
    Doïng something wrong + I have Read a lot of LTSpice Threads on this Forum did thogether light the Bulb !
    You have to pre-Set the Simulator Options in the First place.
    Which in the Other Simulators its Factory pre-set, more user Friendly, can be Altered by Experts if needed in the Second place.
    LTSpice is in my Opinion more something for Experts.
    Conclusion made out of WHO did Reply !
    I almost forgot, Yes ! Current & Voltage are out of Phase NOW ! It Works !
    In the 10 Years past I had a lot of Reference, until this Question.
     
  6. kubeek

    Expert

    Sep 20, 2005
    5,389
    1,021
    I think you can play with LTspice right away, no need to be expert. The interface is a bit quirky and outdated, but for most circuits you should not need help or googling.
     
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