In the present study the tool of impedance spectroscopy was utilized to characterize dielectric behavior of AMn_0.85Ga_0.15O₃ (A=La_0.75Ca_0.08Sr_0.17) composition synthesized by the solid-state reaction. The complex impedance has been investigated in the temperature range 100–360K and in the frequency range 40Hz–2MHz. The Z′ and Z″ versus frequency plots were found to exhibit a semi-circular arc described by an electrical equivalent circuit. The conductivity spectra have been investigated by the Jonscher universal power law: σ(ω)=σ_dc+Aωⁿ, where ω is the frequency of the ac field, and n is the exponent. The activation energy obtained both from dc conductivity and modulus spectrum are very similar, and hence the relaxation process may be attributed to the same type of charge carriers.