Advantech Data Acquisition Modules ADAM 4000 - Manual (Page 326)

Calibration
8-14 ADAM 4000 Series User’s Manual
4. Issue the Analog Data Out command to the module with an output
value of 4 mA.
5. Check the actual output value at the terminals. If it does not equal
to 4 mA, use the “Trim” option in the “Calibrate” sub menu to
change the actual output. Trim the module until the millimeter
indicates exactly 4 mA. In the case of using a voltage meter with
shunt resistor, the voltage meter should indicate exactly 1 V. (When
calibrating for 20 mA using voltage meter and shunt resistor, the
correct voltage would be 5 V.)
6. Issue the 4 mA Calibration command to indicate that the output is
calibrated. The calibrated parameters should be stored in the
modules EEPROM.
7. Execute an Analog Data Out command with an output value of 20
mA, and the output will approximately be 20 mA.
8. Continue executing the Trim Calibration command until the output
current is equal to exactly 20 mA.
9. Execute the 20 mA Calibration command until the present output is
exactly 20 mA. The analog output module will store its calibrated
parameters in EEPROM.