Magnetic probe measurements carried out on the ZT‐40M reversed field pinch [Fusion Technol.8, 1571 (1985)] for low current (50 kA) discharges with and withoutF‐&THgr; pumping are described. The internal probe measurements are used to determine the evolution of the axisymmetric equilibrium profiles. Of particular interest is the profile response to the large‐amplitude, oscillatory, toroidal, and poloidal driving voltages applied duringF‐&THgr; pumping. The results are compared with a two‐field‐line stochastic magnetic field model.