Several non-centrosymmetric heavy-fermion compounds have been reported to exhibit unconventional superconductivity (SC). For example, both CeRhSi3 and CeIrSi3 order antiferromagnetically at ambient pressure, but show SC under pressure. Other isostructural cerium compounds do not show SC and several behave like localized antiferromagnets, with well defined crystalline electric field excitations. CePdSi3 displays two antiferromagnetic transitions (TN1 = 5.2 K, TN2 = 3 K) and we propose to measure the excitations on IRIS both above and below TN1. Above TN1, we wish to examine the quasielastic scattering and extract the temperature dependence of the linewidth, which scales differently in the isostructural antiferromagnets CeRhGe3 and CePtSi3. Studying how the magnetic behaviour changes across this series will aid in understanding the role of magnetism in the SC of this family of compounds.