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Tekscan FlexiForce User Manual

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FlexiForce
Sensors
User Manual
02/26/04
Flexiforce Sensor User Manual (RevC)

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Summary of Contents for Tekscan FlexiForce

  • Page 1 FlexiForce  Sensors User Manual 02/26/04 Flexiforce Sensor User Manual (RevC)

  • Page 2: Table Of Contents

    ......................7 ONDITIONING ENSORS CALIBRATION..........................8 ......................8 ALIBRATION UIDELINES SENSOR PERFORMANCE CHARACTERISTICS ..............9 ........................... 9 EPEATABILITY ........................... 9 INEARITY ..........................9 YSTERESIS ............................9 RIFT ......................9 EMPERATURE ENSITIVITY ....................... 10 ENSOR URABILITY 02/26/04 FlexiForce Sensor User Manual (RevC)

  • Page 3: Introduction

    The FlexiForce sensors can be used to measure both static and dynamic forces (up to 1000 lbf.), and are thin enough to enable non-intrusive measurement. System hardware includes the sensor handle and sensor.

  • Page 4: Overview

    Low (25 lbf ), Medium (150 lbf ), and High (1000 lbf ). The length of the sensors can be trimmed by Tekscan to predefined lengths of 2”, 4” and 6” or can be trimmed by the customer. If the customer trims the sensor they will have to attach a connector to the sensor.
  • Page 5 * When used in the circuit shown. However, the dynamic force range of the sensor can be adjusted by changing the reference resistor (R ) or by changing the Drive Voltage ). (refer to the Saturation section) 02/26/04 FlexiForce Sensor User Manual (RevC)

  • Page 6: Sensor Loading Considerations

    SENSOR LOADING The entire sensing area of the FlexiForce sensor is treated as a single contact point. For this reason, the applied load should be distributed evenly across the sensing area to ensure accurate and repeatable force readings.

  • Page 7: Conditioning Sensors

    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. 02/26/04 FlexiForce Sensor User Manual (RevC)

  • Page 8: Calibration

    Distribute the applied load evenly across the sensing area to ensure accurate force • readings. Readings may vary slightly if the load distribution changes over the sensing area. Note: Read the Sensor Performance Characteristics section before performing a Calibration. 02/26/04 FlexiForce Sensor User Manual (RevC)

  • Page 9: Sensor Performance Characteristics

    Linearity refers to the sensor’s response (digital output) to the applied load, over the range of the sensor. This response should ideally be linear; and any non-linearity of the sensor is the amount that its output deviates from this line. FlexiForce sensors are linear within +/- 5%. HYSTERESIS Hysteresis is the difference in the sensor output response during loading and unloading, at the same force.

  • Page 10: Sensor Life / Durability

    If the sensor is being used at different temperatures, perform a calibration at each of these temperatures, save the calibration files, then load the appropriate calibration file when using the sensor at that temperature. FlexiForce sensors should be stored at temperatures in the range of 15°F (-9°C) to 165°F (74°C). SENSOR LIFE / DURABILITY Sensor life depends on the application in which it is used.

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