The study of the symmetry energy under well controlled laboratory conditions serves to provide constraints for theoretical models covering a wide range of physical phenomena, from the neutron skin thickness of 208Pb to the structure and dynamics of neutron stars. Of particular interest at the present time is the density dependence of the symmetry energy. The INDRA-VAMOS (E503) experiment intends to extract constraints on the density dependence of the symmetry energy at low densities using isotopic scaling and isospin diffusion measurements. In this report the physics motivation and experiment will be discussed in detail, as well as the calibration of the detectors and recent changes to the analysis code.