# Example/test for gmx dielectric?

**URL:** <https://gromacs.bioexcel.eu/t/example-test-for-gmx-dielectric/586>\
**Category:** User discussions\
**Created:** [July 28, 2020, 2:12pm UTC](https://gromacs.bioexcel.eu/t/example-test-for-gmx-dielectric/586 "2020-07-28T14:12:18Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![mkrompiec](https://avatars.discourse-cdn.com/v4/letter/m/b38774/32.png) [@mkrompiec](https://gromacs.bioexcel.eu/u/mkrompiec)\
**Post date:** [July 28, 2020, 2:12pm UTC](https://gromacs.bioexcel.eu/t/example-test-for-gmx-dielectric/586/1 "2020-07-28T14:12:18Z")

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GROMACS version: 2019.3  
GROMACS modification: No  
Hello, can anyone share an example (or test case) for gmx dielectric? I keep getting negative values of the imaginary dielectric constant and I’d like to find out why.  
Thanks,  
Michal Krompiec  
Merck KGaA