FlexiForce user manual

02/05/09 FlexiForce Sensor User Manual (Rev G)
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The saturation value is based on using the circuit and the values shown in the example circuit in
the ‘Application’ section. In this example, the saturation force (maximum force) of each sensor is
related to the RF (reference resistance), and can be altered by changing the sensitivity. The
sensitivity of the sensor would be adjusted by changing the reference resistance (RF); a lower
reference resistance will make the system less sensitive, and increase its active force range.
It is essential that the sensor(s) do not become saturated during testing.
CONDITIONING SENSORS
Exercising, or Conditioning a sensor before calibration and testing is essential in achieving
accurate results. It helps to lessen the effects of drift and hysteresis. Conditioning is required for
new sensors, and for sensors that have not been used for a length of time.
To condition a sensor, place 110% of the test weight on the sensor, allow the sensor to stabilize,
and then remove the weight. Repeat this process four or five times. The interface between the
sensor and the test subject material should be the same during conditioning as during calibration
and actual testing.
IMPORTANT! Sensors must be properly conditioned prior to calibration and use.