Custom curve linearization is a feature available with the Extended option version of all Laureate digital panel meters, counters and timers, excluding only temperature meters. The latter already include preset linearization for specific temperature sensors.

Custom curve linearization can provide exceptional accuracy from low cost transducers, provided that these are repeatable. It can extend the working range of transducers on the high and low ends. It can also solve special application problems where there is a non-linear relationship between the input and the desired readout.

Linearizing is implemented for Laureates in the form of 20 nonlinear spline-fit segments, which provide much better accuracy than a larger number of straight line segments. The typical error will be from 0.1% to 0.01% of full scale, depending on the number of data points used for setup, the error in the data points, and the severity of non-linearities or discontinuities.

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Features

• Achieves exceptional accuracy with low-cost transducers.

• Extends transducer operating range on high and low ends.

• Solves application problems involving non-linear relationships.

• Available with Extended versions of Laureate digital panel meters, counters and timers.

• Easy setup by entering data points into a computer spreadsheet, or typing in desired readings for actual signal inputs.

• Exceptional accuracy from 0.1% to 0.01% of full scale with few data points, made possible by curvilinear spline fits.

Applications

The ability to apply custom curve linearization opens many possibilities, including the following:

• Altimeters, since the relationship between pressure and altitude is very non-linear.

• Rate of ascent based on successive altimeter readings.

• Square root extraction from differential pressure transducers, whose signal may have zero offset.

• Volume of irregularly-shaped tanks, such as horizontal cylinders, based on measured liquid level or liquid pressure at the base of the tank.

• Non-linear transducers, such as thermistors or CdS cells.

• Fine-calibration of linear transducers, since even nominally linear transducers will have nonlinear components.

• Extending the working range of transducers, since many transducers become nonlinear at the low and high ends.

• Compensating for inaccuracy of low-cost transducers.