The DL850 is capable of linearizing an input signal using the Polynomial Feature in the /G3 Realtime Math option. The polynomial feature performs a fourth order polynomial calculation on the selected source waveform. To linearize the input signal using the Polynomial Feature, follow the procedures listed below:

- Press one of the
**CH1**to**CH16**keys to select the source channel - Press the
**RealTime Math**soft button to select ON - Press the
**RealTime Math Setup**soft button - Use the
**Arrow**keys and**SET**button to set the Operation to**Polynomial** - Select the
**Source**waveform - Set the coefficients
**A, B, C, D,**and**E**using the**Jog Shuttle**

__Addtional Information__

Please download and view the attached files for a demonstration of the Polynomial feature on the DL850. The attached example details a thermistor that has been conditioned to produce a duty-cycle variation on a square wave. The duty-cycle as a percentage is __NOT__ linear with respect to the value of the thermistor temperature.

The individual polynomial coefficients can be saved as a setup file on the DL850. The attached Excel worksheet contains the parameters and the error calculation for each duty cycle. For a quick online calculator that can be used as a reference for the coefficient calculation, click on the link provided.

http://www.xuru.org/rt/PR.asp#CopyPaste

The square wave pulse train is decoded by the Duty Cycle feature of the /G3 Realtime Math. The resulting waveform is again processed using the polynomial feature to linearize the input signal. Thus the temperature measurement is linear to the duty-cycle and the remaining error due to linearization is known for each value of duty-cycle input.

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