Long simulation errors
Hi,
I have some long simulations to run and to get realistic resuilts I need to keep the timestep small.
I am getting simulation failures with 'internal simulation error'.
If I remove some variables it can go longer.
After the failure if I open the grapher it tries to graph the data but halts and restarts every 6-8 seconds and starts over -forever. Each try it is able to plot some varying amount of the data. The data is very good with the small timestep as opposed to longer timesteps, but it does not seem MS12 can handle the amoun tof data.
What are the limitations? How many samples of how many variables can I accumulate and still have the simulation and grapher work?
Thanks.
I tried the recorder, but is seems to only take up to four signals. It also hangs MS after closing the configuration panel.
I have had better luck just saving a segment of the data I want. i.e. I run a 50msec simulation but the first 40 msec is start up activity. I tell MS to simulate 40-45 msec, and though it simulates the full interval it only stores the segment of data requested. The grapher can then handle that. At least it could until I tried to turn on sample display. Then it never recovered and I had to kill MS and lost my overnight simulation data. :-(
The fine timestep simulation data is vastly more accurate than default timesteps or other values suggested in the forums.
I should think there should be a simulation option that forces finer timesteps when signals are active and stretches them out when static. If I just set the simulation tolerances tighter does this do that?
Thanks,
David B
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Hey everyone
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Attachments:
CircDesignLEEFI.ms12 225 KBHi,
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http://www.engineers.auckland.ac.nz/~htar006/error/ad636/capture.jpg
http://www.engineers.auckland.ac.nz/~htar006/error/ad636/Circuit2.ms10
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http://www.engineers.auckland.ac.nz/~htar006/error/adg407/capture.jpg
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http://www.engineers.auckland.ac.nz/~htar006/error/ad626/capture.jpg
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http://www.engineers.auckland.ac.nz/~htar006/error/ad623/capture.jpg
http://www.engineers.auckland.ac.nz/~htar006/error/ad623/Circuit6.ms10
http://www.engineers.auckland.ac.nz/~htar006/error/ad623/simulation_log.log
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error.zip 993 KBHi Harold,
Circuit 2
Please use the attached model. The sqrt function is causing a problem with the current SPICE engine, you can replace sqrt with pwr () function and the model should behave the same.
Circuit 1.
You need to add a semi colon to indicate comment on the line shown below. Double click on the component and select Edit Model
R_VB_C 422 500 1E6 components on these nodes
Circuit 4.
I believe this is a model issue. There are many models that were not designed to work single power supply and I believe is the case here.
Circuit 6.
I ran the circuit in ADI edition and also 10.0.1 and was not able to replicate the simulation error.
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When simulating "time step too small " often occurs; After Using Convergence Assistant; I can simulate but the output of XSC1 is not corrent , It include direct flow,
The capacitor C1 not filter dirent flow. and in "alteractive simulation settings" ->"initial conditions" is changed from "Automatically ..." to "user defined"
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summarize: "interactive simulation settings" -> "set to zero" result: output have direct flow.
"interactive simulation settings" -> "user define" result: output have direct flow.
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"interactive simulation settings" -> "Automatically ..." result: simulation error occurs: time step too small
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Hi,
I am new out here,so need your help with a few things.
I am continuously getting a simulation error with almost every circuit i am implementing. It runs the convergence assistant but it couldn't reproduce the error for any of my circuits so didn't help.
Is there any tutorial available or any website which helps out on how to design to remove such errors or steps to rectify them ?
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Since you don't give much information on the error you're obtaining I can think of two common issues, the first one is that Multisim is searching for an unexisting folder and the second one is an issue regarding the power inputs of your circuits. I attach two links to documents that can help you solve either one of the issues I mentioned, but if you get a different error from the ones I've told you, could you send more information regarding the error you obtain?
http://digital.ni.com/public.nsf/allkb/221393F998C08491862571ED0077FCC3?OpenDocument
http://digital.ni.com/public.nsf/allkb/15526EB2464F3EDD8625722C00696BB0?OpenDocument
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