Lead iron niobate, PbFe${1/2}$Nb${1/2}$O$_{3}$ (PFN), is a multiferroic material exhibiting paraelectric to ferroelectric and paramagnetic to G-type antiferromagnetic transitions at 385 and 143 K, respectively. It is an attractive material for use in multilayer ceramic capacitors and other electronic devices due to its high dielectric constant ~10^4, diffuse phase transition behavior, and low sintering temperature. Experimental evidence has been provided which demonstrates substantial magnetoelectric coupling in this system, though this comes from changes in dielectric behaviour near the Neel temperature. The objective of this experiment is to observe the microscopic changes in magnetism produced by changing the electric field. Muon-spin rotation is an ideal technique to do this and we have developed a suitable sample cell in which such an experiment can be performed.