Force Sensor outputs negative result with no force applied.
The TE FX1901 force sensor included with the ADMW1001 force measurement kit has an offset specification of +/-15mv/v. Since the output of the ADMW1001 is a ratio of the force applied to the sensor, it is possible to see an output in the range of -0.0015 to +0.0015 with no force applied. In typical applications a calibration at zero force is performed to remove this initial offset error. This is know as a Tare.