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How does the FT3 achieve high precision?

Sensor

The FT3 is uses a precision LVDT displacement sensor with highly stable electronics to produce a very sensitive transducer system.

Measurement Parameters-The key to repeatability and accuracy is to tightly control all the parameters that can lead to measurement uncertainty.
The parameters that affect thickness measurement are;

  • Measurement pressure.
  • Presser foot profile and size.
  • Measurement velocity.
  • Parallelism of presser foot to measurement plate.
  • Dwell time.

To allow manufacturers in the same industry sector to measure using the same conditions, these key measurement parameters are often specified by international standards (ASTM/ISO etc.).

External Factors

External effects such as temperature change and vibration will affect the measurement, the FT3 instrument is designed to reduce the impact of these.

Calibration

The FT3 has a multi-point calibration routine to reduce/eliminate the effect of non-linearity in the LVDT sensor.

Electronic Drift

The 0.01micron resolution instrument includes routines to reduce the effects of short term thermo-electronic drift of <0.1 microns.

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