  Building a full understanding of the complex magnetism in the rare-earth
pyrochlore iridates, A2Ir2O7, is an ongoing issue in condensed matter physics.
The possibility of two interpenetrating and interacting frustrated magnetic
pyrochlore sublattices, connected with the strong spin-orbit coupling of the 5d
Ir4+ ion, lends itself to a wide array of potential electronic and magnetic
states. In this paper, we present longitudinal field and zero field muSR
measurements of Er2Ir2O7. The muSR response of Er2Ir2O7 is dominated by the
strong fluctuating fields of the Er3+ (J = 15/2) moments, showing a peak in
fitted relaxation rate, {\lambda}_2, at T = 15 K . The muSR spectra show just
weak signatures of the Ir transition, that were easily suppressed in applied
longitudinal field, however full decoupling of the muons from local magnetic
fields was not achieved even in applied fields up to 3 kG.
