===Non-Linear Calibrations===

Not every calibration is linear.

Although ARDI initially assumes that your calibration will be linear - breaking your range up into evenly spaced segments depending on your point count - you can override this behaviour.

==Example==

For example, let's look at a flowmeter calibration.

This flowmeter is measuring flow speed. It has a linear //input// between 0 and 20 m/s. 

It has a digital display reading in L/s. Although this is a radically different scale than speed, it's still linear - a movement between 2 and 4s will double the speed on the display.

But the //output// is a square-root output, which is often used (particularly in older systems) to mask signal noise at the low-end of the instruments sensitivity. 

==Setting it up in ARDI==

This calibration needs three properties.

**Range - Input**, \\
**Range - Output** and\\
**Range - Display**.

Once all three are present on your asset, you'll need to go to the [[Asset Maintenance Page]] and choose **Calibration Settings**.

{{:maintenance:linearcalsettings.png?400|}}

Here you can fine-tune the actual calibration points against one-another. 

Choose one of these columns - normally your //input// - to be linear, and alter the other columns to have matching values.