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Hi dear people,I’m simulating a control system (with a PID regulator) with LTSPICE ver.4.21, and I’m trying to optimize. For each simulation I want to calculate the 5% settling time. I’ve found the .measure instruction inside a script file, but I can’t understand how it works. Is it possible to define a range of values (285-315) and calculate the time to enter in it without came out? The command.MEAS TRAN SettlingTime5pc FIND V(Uscita) WHEN (V(Uscita)=285 || V(Uscita)=315) cross=lastdoesn’t work. How can I define a range?
Hello rbacchi,
You were on the right track. I’ve applied the .MEAS directive to this simple second order RLC circuit:
I’ve chosen the components values ​​to make it quite underdamped:
go to “View” menu, and click SPICE Error Log file (or CTRL+L).
the higher value is the settling time. If you want a 2% settling time, simply set settling_percent=2.
Magic Cribald,your solution works perfectly!Do you think may be possible to use an instruction that prints the max value between the two times?Thank you a lot,RobertoCiao Roberto,
add directive:
.MEAS TRAN settling_time PARAM max(t_lo_settling,t_hi_settling)
Two times Magic!
It works perfectly!Thank you a lotRoberto
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