An ablation device having an electrode control system configured to adjust an output of an active electrode and a variable aspiration control system configured to control aspiration in an aspiration system based upon the output of the active electrode is disclosed. In particular, the variable aspiration control system may adjust the aspiration within the aspiration system between at least a zero aspiration setting corresponding to a low ablation power setting and a high aspiration setting corresponding to a high ablation power setting, whereby a plasma field developed at the active electrode at the high ablation power setting is greater than a plasma field developed at the active electrode at the low ablation power setting. By reducing, if not, ceasing the aspiration provided by the aspiration system for the low ablation power setting, the variable aspiration control system is able to reduce the likelihood that the plasma field will be disturbed.