  Resistive Plate Chambers have a very important role for muon triggering both
in the barrel and in the endcap regions of the CMS experiment at the Large
Hadron Collider (LHC). In order to optimize their performance, it is of primary
importance to tune the electronic threshold of the front-end boards reading the
signals from these detectors. In this paper we present the results of a study
aimed to evaluate the effects on the RPC efficiency, cluster size and detector
intrinsic noise rate, of variations of the electronics threshold voltage.
