User calibration

Notice

The user calibration affects the measuring range monitoring.

Incorrect calibration coefficients can lead to the Status bits and Status LEDs no longer behaving as expected; see Measuring range monitoring.

The intended purpose of the user calibration is to calibrate the device, for example, in a smaller measuring range than that calibrated by the vendor. As a result, a higher accuracy can be achieved in the smaller measuring range.

The correction function has the same form as the correction function of the vendor calibration:

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

Enabling the user calibration

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

Channel	Index of "Enable user calibration"
1	0x8010:0A
2	0x8020:0A

Setting the calibration coefficients

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

Channel	"User calibration offset"	"User calibration gain"
1	0x8010:17	0x8010:18
2	0x8020:17	0x8020:18