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Creating a Polynomial Scale

Last Modified: June 10, 2021

Convert values using a polynomial equation with up to ten coefficients.

VeriStand requires two direction coefficients for a polynomial scale. They are a forward polynomial to convert pre-scaled values to scaled values and a reverse polynomial to convert scaled values to pre-scaled values.
  1. Launch the VeriStand Editor.
  2. In the Project Files pane, double-click a system definition file (.nivssdf). System Explorer opens.
  3. Right-click Scales and select Add Scale»Polynomial Scale.
  4. On the new scale's Polynomial Scale Configuration page, enter the scale Name and Units to associate with the scaled values.
    spd-note-note
    Note  

    The units you enter will supersede the units associated with the channel.

  5. In the Coefficients drop-down menu, choose one of the following directions for the coefficients table.
    Direction Description
    Forward Coefficients table represents a polynomial from pre-scaled to scaled values.
    Reverse Coefficients table represents a polynomial from scaled to pre-scaled values.
  6. Enter Coefficients for an order of the polynomial in the table control, where the coefficients are a0, a1, a2,...an for your polynomial scale y = a0 + a1x + a2x2 + … + anxn.
    spd-note-note
    Note  

    For forward coefficients, y is the scaled data and x is the raw data. For reverse coefficients, x is the scaled data and y is the raw data.

  7. Save the system definition file.
After creating a direction coefficient, you can click Generate to use regression analysis to estimate coefficients for the opposite direction. In the dialog box, enter a Minimum and Maximum value for the raw range and click OK.

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