Docu-No.: 0590020601-EN Rev. 1.6.0
Page 67
Other Programming
3
Calibrating analog I-O 3.2
3.2
Calibrating analog I-O
The formula for an analog value output can be demonstrated by the
following formula as an example. Setpoint will be used as the value
and 20 mA is the full scale representation.
Deadband works as indicated in the following equations.
To calibrate an analog output, do the following. In this example,
setpoint is the output parameter.Have your calibration meter
connected to the analog output.
1. Enter Setpoint =0.
2. Modify the min value so that the actual analog output is correct.
Note:
for a 4-20 mA signal, this will be around 20%.
3. Enter Setpoint = Max Setpoint, Adjust Aout max value so that
analog output is exactly correct.
4. Double check with Setpoint = 0, but no adjustment is normally
required.
Val
20
Setpoint
MaxRate
------------------------
AoutMax
AoutMin
–
AoutMin
+
=
Val
Deadband Val
0
Val
Deadband Val
PreviousVal
Val
Deadband Val
NewVal
