User calibration

From Firmware 05

Notice

Measured value resolution is reduced to 1 mg/LSB

If the user calibration is enabled, the measured values are output with a resolution of 1 mg/LSB regardless of the set measured value resolution.

If you require a measured value resolution other than 1 mg/LSB, you can implement the user calibration in your PLC. See chapter User calibration in the PLC.

You can use the user calibration to minimize the measurement uncertainty.

During user calibration, the measured values are calculated internally using a correction function. The correction function has the following form:

Y_U = G_U* ( X_U – O_U )

Y_U : Measured value after the user calibration

X_U : Measured value before the user calibration

G_U : Gain

O_U : Offset

Enable user calibration

The user calibration is disabled in the factory setting. It can be enabled individually for each acceleration axis. To do this, set the corresponding CoE parameter “Enable user calibration” to TRUE:

Acceleration axis	"Enable user calibration"
X	8000:0A
Y	8010:0A
Z	8020:0A

Setting the calibration coefficients

Set the calibration coefficients via the CoE parameters "User calibration offset" and "User calibration gain":

Acceleration axis	"User calibration offset"	"User calibration gain" ¹⁾
X	8000:17	8000:18
Y	8010:17	8010:18
Z	8020:17	8020:18

¹⁾ The parameter "User calibration Gain" is scaled with the factor 2¹⁴ (16384_dec).
The default value 16384_dec of the parameter therefore corresponds to Gain = 1.

Further Information

User calibration in the PLC