Calibrating Process Values; Table 31: Signal Types; Table 32: Variable Legend - Calibrating Measured Values - WAGO I/O-SYSTEM 750 Manual

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Calibrating Process Values

Manufacturer calibration serves to compensate for tolerances in electrical
components of the I/O module. User calibration allows you to compensate for the
tolerances of electrical components of both the I/O module and connected devices
and to take into account factors such as component age and different ambient
temperatures at the installation site.
User calibration by channel required!
Perform the calibration for each channel individually to achieve the greatest
possible measurement accuracy for each channel.
The following signal types are specified:

Table 31: Signal Types

ID
1
2
The variables in the following equations have the following meaning:
Table 32: Variable Legend – Calibrating Measured Values
Variable
m
b
x1
x2
y1
y2
The "Gain" and "Offset" values are required to perform user calibration. The
calibration gain is the factor by which the process value is amplified. The
calibration offset is the offset of the process value on the y axis.
The following general calibration equation applies:
y = (x + b) × m
The general calibration equation yields the following two equations for
calculating the two values sought:
Calibration gain: m = (y2 – y1) / (x2 – x1)
Calibration offset: b = y1 – (m × x1)
Manual
Version 1.0.0
Signal type Voltage range
0-10 V 0 V ... +10 V
+/- 10 V −10 V ... +10 V
Explanation
Calibration gain (gain factor)
Calibration offset (offset)
Expected output voltage 1
Expected output voltage 2
Process value 1
Process value 2
WAGO-I/O-SYSTEM 750
750-597 8AO 0-10V/±10V DC