We present the characterization of a miniaturized ionic liquid electrospray thruster for Nanosatellite applications. The thruster investigated features an emitter array of 480 emitter tips per square centimeter and a 1 cubic centimeter propellant tank with an entirely passive propellant supply, and is operated at a power level of < 0.15W. The paper presents energy-, and mass-resolving beam spectroscopy of the packaged thruster system, as well as two independent thrust measurements. This allows to derive thruster performance parameters under realistic firing conditions, including individual thruster e ciency contributions, specific impulse and thrust. Total thruster e ciencies of 36%, specific impulse of ⇠ 760s, including all losses, and thrust of 11 12.5µN are presented, at emission currents of 150µA, for a device of ⇠ 1cm 2. Current emission data without current decay of ⇠ 90h is presented, with a maximum of 172h.
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