Questionable reference result for Modelica.Electrical.Analog.Examples.OpAmps.DifferentialAmplifier

[maltelenz]

In the reference results for the Modelica.Electrical.Analog.Examples.OpAmps.DifferentialAmplifier, at time 0.18945 there is a really odd jump in the opAmp.v_out variable:

SystemModeler doesn't reproduce this, and it seems incorrect.

[AHaumer]

I can't reproduce that odd jump with Dymola 2020 and tolerance 1e-6.
Maybe the reference result was taken before we changed the tolerance?

[beutlich]

It is reproducible with tolerance=1e-7.

https://github.com/modelica/MAP-LIB_ReferenceResults/blob/05a2353725dc7e73c54dfbbea0e73d2def2192ad/Modelica/Electrical/Analog/Examples/OpAmps/DifferentialAmplifier/creation.txt#L41-L48

[beutlich]

I uploaded the new reference file by modelica/MAP-LIB_ReferenceResults@432e32b

Still, I want to keep this issue open as a reminder for @HansOlsson to analyze the solver issue.

[maltelenz]

SystemModeler passes correctness against the updated reference results, thank you @beutlich.

[beutlich]

Thanks for confirmation. Still a workaround only, since those updated ref results have to be created manually.

[beutlich]

Still, I want to keep this issue open as a reminder for @HansOlsson to analyze the solver issue.

Closing as tool-issue, finally.