If the B1 multiplier is 1.75 some circuit voltages reach tens of megaVolts. Is it legal for Blizzard to completely shut down Overwatch 1 in order to replace it with Overwatch 2? What does 'levee' mean in the Three Musketeers? This works fine for certain cases, but when I do the parametric sweep, it gives inaccurate readings because of two issues: Here, I assume at 1000th cycle, signal reaches its measurement window (say from time=4ms) but sometimes it doesn't. I want to find fundamental frequency of a periodic signal (non-sinusoidal) in certain time window using the .meas command in LTSpice. Going any deeper (where one calculation depends on another etc.) Replace your resistive load with a independent current source as shown below and define the . rev2022.11.15.43034. Speeding software innovation with low-code/no-code tools, Tips and tricks for succeeding as a developer emigrating to Japan (Ep. Can anyone give me a rationale for working in academia in developing countries? @PlasmaHH, I narrowed down the question. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, If you are only interested in the harmonics, the .four command may be for you, It sounds a bit like mission impossible: you don't know the fundamental (ok, that's your goal), but you don't know how your circuit will behave (settling time), or how many harmonics it will have (can't rely on, Thanks, actually, the settling time is known. I've tried changing almost all parameters in the LTSpice IV control panel (including checking "NoOpiter"), but . points - step command. Why is it valid to say but not ? .MEASURE -- Evaluate User-Defined Electrical Quantities . 505). I have the .MEAS command on the circuit. Use MathJax to format equations. To get results and not pull errors within LTspice, it becomes useful to use curly brackets. Measurement "imp2" FAIL'ed How to run new .meas commands without having to rerun the whole ltspice simulation? I assume that the "imp2" failure is due to the "id1" failure. Add items as subpages (rather than details at this page level). I was using the following code to calculate frequency (in kHz). imnoexpertbut Set the Tools/Control panel/ Operation / Generate Expanded Listing and tick (yes) to see a more comprehensive output listing - helps with debugging, http://ltwiki.org/index.php?title=Hints_on_using_individual_LTspice_commands_and_things_the_Help_Manual_sometimes_may_not_help_you_with&oldid=1999. It looks like you know your final simulation time, and the waveforms are about settled at the end of it, so, considering what I see in your picture, you can consider 4.4ms a mark from which you can measure, like this: Looking more closely (the grey-ish waveform), it looks like you have skewed sines in there, which will account for harmonics, so you can't really rely on this measurement for detecting the fundamental, only its apparent period. To learn more, see our tips on writing great answers. The DC operating point analysis calculates the DC voltage and current of each node in the steady state of the electronic circuit. Yes, I looked at it briefly. Remove symbols from text with field calculator. Hints on using individual LTspice commands and things the Help Manual sometimes may not help you with JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. Error with Sub-circuit spice model nodes as "Text" Instead of Unsigned Integer in Mindi SIMPLIS, Total power dissipation of a circuit in Ltspice. This page was last edited on 3 November 2019, at 16:15. Review the LTspice help for behavioral sources to know why V=I(RLoad)/10 doesn't work: This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Due safety precautions should be taken with any circuit involving mains voltage or electrostatic-sensitive components. Thanks, But this will also have the same two issues associated with my code in the question. Run the sim first Place the cursor red test probe on the junction of V2 and R6..press and hold down the keyboard 'CTRL' key [ a new black probe will appear] move it to the junction of C2 and RL and the release the CTRL key.. a plot should appear on the Sim. Let's keep things in the open forum. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. For a better experience, please enable JavaScript in your browser before proceeding. Unused port in hierarchical block in LTspice, LTSpice - Digital A - Hysteresis with Ref, SMPS Power Supply Failed Due to Poking a Screwdriver inside (Rush current to Earth left a weld mark on screwdriver earth terminal). Asking for help, clarification, or responding to other answers. Therefor, I want to specify the absolute time for the measurement. But how do I view the results? I did this with 1 bsource and an SR-latch. To see the results in LTspice use the Error Log (a better name would have perhaps been Results Log or Output Log), The quickest way to check a calculation before you commit it to a library is to create a section of text within the LT schematic. .meas tran T1 find time when V(OUT)=0 rise 1000 where: out is the name of your output pin, CROSS=1 and CROSS=3 stands for "the 1st and the 3rd time the signal crosses the specified value", in this case vdd/2 assuming vdd = 3.3V. With the following schema: C1 N002 0 22 R1 N001 N002 220 V1 N001 0 5 .tran 0.02 startup .meas tran EnergieFournie integ ( 5 * I(R1)) .meas tran EnergieDissipee Elsewhere the circuit has plenty of resistors, so the problem may be elsewhere, I don't know. My circuit designs should be regarded as experimental. I think this message isn't appropriate for our group. However, in the real world, a parameter sometimes needs to be defined from other parameters. \$\begingroup\$ It sounds a bit like mission impossible: you don't know the fundamental (ok, that's your goal), but you don't know how your circuit will behave (settling time), or how many harmonics it will have (can't rely on .meas).The only thing I see is to run your simulation and then View > FFT, and then decide which one is your fundamental, but this is not an automated process. Two useful tools, the .step and .meas commands, can be used to calculate and plot efficiency over a range of load currents. The Group moderators are responsible for maintaining their community and can address these issues. If that is checked, try it again, unchecked. from 4ms in this case, I have added a sample voltage waveform as below (with parametric sweep), Is it possible to specify the starting time for the above code so that it will count cycles from the specified time? Well hell, sorry. Connect and share knowledge within a single location that is structured and easy to search. It may not display this or other websites correctly. The new topic will begin with this message. sub-circuit's pin, which produces the convenient Ix() Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. Just change RL's value from 50 to {R} and add the following line as a Spice directive somewhere on your schematic (you can press S to do that or pick it from the edit menu or the toolbar . .measure tran imp2 PARAM vout1/id1 In this article, we will explain in detail the DC operating point analysis(.op) method in LTspice. There are two basic different types of .MEASURE statements. Found from the toolbar: How friendly is immigration at PIT airport? Please do not PM me with forum related questions. May I ask you to add to the question a waveform screenshot of the signal you'd like to study? I guess you know that with that amp theVoltage gain will not be very meaningful.? cause a .measure statement to be treated differently outside of LTspice? I use this to evaluate the propagation delay, also in .param simulations and it worked so far. Sometimes it helps the simulation, if you install a low-ohm resistor inline with a component. The best answers are voted up and rise to the top, Not the answer you're looking for? Plot the current a zero voltage source in series with the What would So your third statement could read, for example. Check your results in the error log Thank you. From: LTspice@groups.io <LTspice@groups.io> On Behalf Of imnoexpertbut Sent: Sunday, September 19, 2021 4:33 PM To: LTspice@groups.io Subject: EXTERNAL: [LTspice] Measurement "id1" FAIL'ed: .measure tran id1 RMS Ix(U1:D) I have a simulation that includes several .measure statements:.measure tran vout1 RMS V(N001).measure tran id1 RMS Ix(U1:D).measure tran imp2 PARAM vout1/id1.measure tran i . Basically, I want an automated way to get an approximate value close to the fundamental from view > FFT - for a zoomed window (e.g. Although they work in simulation, their component values may need altering or additional components may be necessary when the circuits are built. ((Vout * Iout) / (Vin * Iin). By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Im not, either, but could this be due to the .raw file disappearing when the run is complete? Real-time clock modules feature wide temperature range. Beginning with the simplest definition, LTspice doesn't require curly brackets: This could be used to define a resistor of 1000 Ohms. One of the more confusing aspects of using .param (at least when I began using LTspice) was where and when do you use the curly barckets { }? to the new location, and left click to place the component. When I however connect Vfb (feedback voltage) to the connection of R1 and R2 in stead of to the voltage source B2, the simulation works fine, as shown in the curves above. It only takes a minute to sign up. from 1.4ms to 1.5ms). You are using an out of date browser. .measure tran i_out RMS I(C37) Session ID: 2022-10-20:45205ef110664b9ae161a767 Player Element ID: video-5579265856001-. pseudo-current, use the Alt-Click method on the wire to the Tony, Vlad, Andy,Thanks for addressing and solving my problem in such a prompt and thorough manner. Stack Overflow for Teams is moving to its own domain! By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. I think this violates the Terms of Service. Set the text as LTspice directive (command), then run the schematic, Finding the measure results of a simulation There is a checkbox under Tools>Operation, Automatically delete RAW file. What is the function of the "name" in this statement? This is mentioned in the help. The second b-source detects whether the threshold is above 7mV (vout2 node) and the latch triggers the first time vout2 goes high and then stays high. JavaScript is disabled. Are softmax outputs of classifiers true probabilities? LTSpice: Get linear results using .meas command, LTspice .meas command: unexpected single fail in step when the rest passes ok, How to take Time Measurements using LT Spice, LTspice - Determining the slope automatically via LTspice of a curve obtained by meas. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. .measure tran id1 RMS Ix(U1:D) GCC to make Amiga executables, including Fortran support? This includes: harm to minors, violence or threats, harassment or privacy invasion, impersonation or misrepresentation, fraud or phishing. Subject of the new topic: I have a simulation that includes several .measure statements: imnoexpertbut wrote, "What would cause a .measure statement to be treated differently outside of LTspice?". If I understood correctly your signal is periodic, therefore I would expect a command like this to properly measure your fundamental period: .MEAS TRAN TRise TRIG when v(out) = 1.65 CROSS = 1 TARG when v(out)=1.65 CROSS=3. will invite LTspice to complain with an error. .meas tran Frequency param 100/(1000*(T2-T1)). How many concentration saving throws does a spellcaster moving through Spike Growth need to make? Example, the leg containing L3 has a supply but no resistance, therefore it cannot calculate an L/R time constant. of the simulation but are not available for output through the .measure statement when XVII64.exe is run from the command line or in a batch file. sub--circuit pin instead. Ok, I think I misunderstood your question then. operation. LTspice can perform frequency domain noise analysis which takes into account shot, thermal and flicker (1/f) noise. It could be that the save options do not include subcircuit currents. Either of these two options will fix the issue with batch mode Are you sure you wish to delete this message from the message archives of LTspice@groups.io? View/SPICE Error Log, Suggestion: The results are shown below, the first source is just a sine wave with increasing amplitude. Press F4 to place net names. Just delete the 'ac' from your statement so that it reads. I've recently started using LTspice again after a long layoff and it's obvious that I have lost some of the basics.Regards,MDM. hi cz, I will look thru your circuit, let you know. I do not care about harmonies either. You are using an out of date browser. because of the different impedances of the source and load. Those that refer to a point along the abscissa (the independent variable plotted along the horizontal axis, i.e., the time axis of a .tran analysis) and .MEASURE statements that refer to a range over the abscissa. Sci-fi youth novel with a young female protagonist who is watching over the development of another planet, Solving for x in terms of y or vice versa. Its name is PD20015C.asy. Measurement "id1" FAIL'ed How do you know that an oscilloscope is displaying the actual waveform? What do you do in order to drag out lectures? I was at work so tossed it out there. LTSpice: How to use .meas command to find the fundamental frequency of non-sinusoidal signal? ( I tried to use trig-trag and from-to commands but failed). .measure tran imp3 PARAM vout1/i_out The simulation runs fine inside LTspice XVII64.exe; however, if I run it from the command line or a batch file, I get the following in the .log file: I'm trying to use LTspice to measure some aspects of a simple circuit (attached below) using the .MEAS[URE] command, but I don't know how to get results from it. The resulting noise density (in units of volts per square root hertz) can then be plotted to aid in circuit analysis and understanding. I have a simulation that includes several .measure statements: .measure tran vout1 RMS V(N001) To evaluate efficiency, clearly label your input and output voltage net as IN and OUT, respectively. I suspect (could be wrong) if the multiplier is 2 that some number limit of LTS is exceeded, so the impossible is being attempted. Even in GUI current plotting, instead of clicking on the I apologize for not providing the .asy symbol file. As the software has been made freely available I suppose we shouldn't complain (well, not too loudly anyway)! The following circuit (stability measurement) shows a problem: The simulation waits to show curves forever (well, I did not wait that long), and when I interrupt the simulation manually it shows the error "Failed to find the DC operating point for AC analysis". When the migration is complete, you will access your Teams at stackoverflowteams.com, and they will no longer appear in the left sidebar on stackoverflow.com. .meas tran T2 find time when V(OUT)=0 rise 1100 Is there a penalty to leaving the hood up for the Cloak of Elvenkind magic item? Again, sorry it is of no help. From: LTspice@groups.io
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