Abstract: Certain embodiments provide a system and method for auto-threshold adjustment using a continuous ink jet printer. An embodiment of a system includes a nozzle for producing ink drops from an ink stream, a sensor positioned with respect to the nozzle for measuring charge from the ink drops to generate a charge signal, a peak detector for detecting peaks in the charge signal, and a threshold storage device for adjusting the threshold based on a number of detected peaks. In an embodiment, the threshold storage device stores the threshold. The threshold storage device may be a digital potentiometer, for example. The system may also include a comparator comparing the charge signal to the threshold. The comparator may select between the threshold and a standard reference signal to compare to the charge signal.