Calculating Amount/Concentration - Calibration Curve Fit Types: Cubic Fit - Tip281

OBJECTIVE or GOAL

With Empower, calculate Amount/Concentration, Calibration Curve fit types, and review Cubic Fit. 

ENVIRONMENT

• Empower
• Empower Tip of the Week #281

PROCEDURE

STEP 1
For a Cubic Fit, Empower performs a least-squares fit of a cubic polynomial to the calibration points. A minimum of four points is necessary and six points are recommended (Figure 1).

STEP 2
The Cubic Fit generates a Calibration Curve that is represented by the equation in Figure 2. 
 

STEP 3
Calibration Curves can be accessed in various ways, for example:

1. Review – bring a result into Review and click on the Calibration Curve tool
2. Compare – right-click on a curve from the Curves tab in the project and select Compare
    

ADDITIONAL INFORMATION

This can be done with either the Pro or QuickStart interface.