In order to test and calibrate electric propeller thrust with a resolution of 0. 1 μN,a design using two pendulums was propased. By subtracting the signal of the reference pendulum from the signal of measuring pendulum,most common mode noise can be rejected. By adopting capacity-bridge as displacement sensor,force from 0. 1 μN to 1 mN and frequency from 10- 3Hz to 0. 016 Hz can be measured to an accuracy of 0. 1 μN.
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