Calibration and scaling

The signal path contains three functions for calibrating and scaling the measured values:

Vendor calibration
User calibration
User scale

Vendor calibration

Notice

Increased measurement uncertainty when disabled

If you disable the vendor calibration, the measurement uncertainty specified in the technical data is no longer guaranteed.

The vendor calibration is enabled in the factory setting. You can disable it via the parameter 0x80A0:0B "Enable vendor calibration".

The coefficients of the vendor calibration cannot be adjusted. You can view them in the following parameters:

Offset: 0x80AF:01
Gain: 0x80AF:02

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.

The user calibration is disabled in the factory setting. It can be enabled via the parameter 0x80A0:0A “Enable user calibration”.
If you use the user calibration, it may be useful to disable the vendor calibration.

You can set the coefficients of the user calibration in the following parameters:

Offset: 0x80A0:17
Gain: 0x80A0:18.

User scale

The user scale is disabled in the factory setting. It can be enabled via index 0x80A0:01 "Enable user scale".

You can set the coefficients of the user scale in the following parameters:

Offset: 0x80A0:11
Gain: 0x80A0:12

Summary

Calibration / scaling	Status	Correction function	Meaning
Vendor calibration	enabled (default): 0x80A0:0B = TRUE	Y_H= (X_ADC– B_H) x A_Hx 2^-14	Y_H: Measured value after the vendor calibration B_H: Offset vendor calibration (0x80AF:01) A_H: Gain vendor calibration (0x80AF:02)
Vendor calibration	Disabled: 0x80A0:0B = TRUE	Y_H= X_ADC
User calibration	enabled: 0x80A0:0A = TRUE	Y_A= (Y_H– B_A) x A_Ax 2^-14	Y_A: Measured value after vendor and user calibration B_A: Offset user calibration (0x80A0:17) A_A: Gain user calibration (0x80A0:18)
User calibration	Disabled (default): 0x80A0:0A = FALSE	Y_A= Y_H
User scale	enabled: 0x80A0:01 = TRUE	Y_S= Y_Ax A_Sx 2^-16+ B_S	Y_S: Measured value after user scale B_S: Offset user scale (0x80A0:11) A_S: Gain user scale (0x80A0:12)
User scale	Disabled (default): 0x80A0:01 = FALSE	Y_S= Y_A