Static characteristics of a mN range thrust stand and uncertainty analysis of thrust measurements

In order to obtain thrust stand static characteristics including sensitivity, linearity, hysteresis, repetition, resolution and long-term stability, the thrust stand were statically calibrated by means of weight measurement. It is proven that the feasibility of electromagnetic force technique measuring mN range thrust. Effect factors were analyzed; thrust produced by a cold gas thruster was measured by the thrust stand as a validation test. The results show that uncertainty of the thrust is mainly ascribed to static characteristics. During measurement, pumps' vibration may cause change of force produced by the propellant pipe, leading to thrust stand zero drift output, which may also increase uncertainty.