Patent ID: 8486485

Claim:
A method of dispensing imprintable medium from a dispenser comprising a chamber, a nozzle, and an actuator connected to the chamber, the method comprising: actuating the actuator such that it generates a pressure wave within the chamber which causes imprintable medium to be dispensed from the nozzle; and monitoring operation of the dispenser by monitoring a transient oscillation signal generated when the actuator is actuated, the monitoring further comprising comparing values associated with a plurality of parts of a waveform of a reference transient oscillation signal with values associated with a plurality of parts of a waveform of the monitored transient oscillation signal, and notifying of an error in the operation of the dispenser if there is a variation between one or more values associated with the plurality of parts of the waveform of the monitored transient oscillation signal and one or more values associated with the plurality of parts of the waveform of the reference transient oscillation signal.