  Electric charge correlations were studied for p+p, C+C, Si+Si and centrality
selected Pb+Pb collisions at $\sqrt{s_{NN}} = 17.2$ GeV with the NA49 large
acceptance detector at the CERN-SPS. In particular, long range pseudo-rapidity
correlations of oppositely charged particles were measured using the Balance
Function method. The width of the Balance Function decreases with increasing
system size and centrality of the reactions. This decrease could be related to
an increasing delay of hadronization in central Pb+Pb collisions.
