Using .MEASURE on DC sweeps in LTspice

Question

How can I .MEASURE at what input voltage a certain current occurs when doing a DC sweep in LTSpice?

For instance, consider the following situation:

I was hoping to find the voltage that generates a base current of \$200\mu\text{A}\$ by using FIND ... WHEN as shown in the image, but I only get Measurement "ub" FAIL'ed. (I guess the syntax is not applicable to DC sweeps?)

Why can't you just plot Vbe against Ib instead and look at the resulting graph? — Andy aka, Dec 17 '21 at 13:44
`Ib(Q1)` never gets to be `200u` given your setup; try `20u`. You could have found this out for yourself if you had actually plotted the waveforms. — a concerned citizen, Dec 17 '21 at 15:07

Syed · Answer 1 · 2021-12-17T15:34:38.067

1

Here is the command to measure it when you eventually get it to 200uA.

Another variation with respect to the sweep variable:

edited Dec 17 '21 at 15:34

answered Dec 17 '21 at 15:27

Syed

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Using .MEASURE on DC sweeps in LTspice

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