Patent ID: 8002378

Claim:
A nozzle testing apparatus that tests whether a recording liquid has been ejected from a plurality of nozzles, the nozzle testing apparatus comprising: a print head provided with the plurality nozzles; a voltage applying unit applying a voltage between at least two measurement terminals in a predetermined direction; a head driving unit capable of ejecting the recording liquid from the plurality of nozzles; a voltage change acquiring unit capable of acquiring a change of the voltage between the measurement terminals, the change of voltage being generated in accordance with an ejection of the recording liquid; and an ejection checking unit capable of individually determining whether the recording liquid has been ejected from the plurality of nozzles using the change of the voltage; and a nozzle selecting unit capable of selecting a first nozzle and a second nozzle to be tested from the plurality of nozzles, wherein one of the at least two measurement terminals is disposed in the print head and wherein another of the at least two measurement terminals is disposed on an ejection target wherein the head driving unit drives the print head for ejecting the recording liquid from the second nozzle after a predetermined interval from when the head driving unit drives print head for ejecting the recording liquid from the first nozzle, wherein the predetermined interval is longer than a time to determine whether the recording liquid has been ejected from the first nozzle using the change of voltage generated in accordance with the ejection of the recording liquid from the first nozzle, wherein the predetermined interval is shorter than a time during which the change of voltage generated in accordance with the ejection of the recording liquid from the first nozzle continues.