I/O Calibration
AO Calibration
164
900 Control Station User Guide
Revision 9
May 2014
AO Calibration
ATTENTION
You should not access the Process Control Utilities Calibrate Controller Analog I/O display
while the IO calibration display is being displayed, or vice versa. Calibration can't be done as
long as both displays are shown; user must exit either display to do a calibration.
Analog outputs are factory calibrated to +/- 0.1% of span. A field calibration may be performed on any
analog output on a point-by-point basis to optimize accuracy. The factory calibration parameters are
retained in non-volatile memory and may be re-installed to undo a field calibration using selections from
the calibration procedure.
Both Factory and field calibration information is stored on the Analog Output module itself. Therefore,
once a module has been calibrated it can be moved to any slot position or any rack without being
recalibrated.
Item
Description
Instrument Status And
Instructions
This shows the status of the calibration. In order of appearance statuses are:
Ready
Measure AO 0% Output & Enter
0% AO Output
Measure AO 100% Output & Enter
100% AO Output
AO Cal Failed (red) or Done (green)
Save AO Calibration
Reference
Indicates output reference value and engineering units. Also indicates an invalid
module or channel.
Rack Number
Module Number
Channel Number
Enter the rack, module, and channel of the AO channel to be calibrated.
Select Output
Select this to verify that the selected module is installed in the controller.
Measured Values (mA)
Measure the actual output (as mA, mV or Volt) and then enter the measured value in
mA here.
Calibrate 0% Output
Select this to calibrate. Status will indicate when calibration is complete.
Calibrate 100% Output
Select this to calibrate. Status will indicate when calibration is complete.
Save
Select this to save the channel calibration.
After calibration, return the Controller to Run mode. Use IO Calibration display (page 159) or Controller
Mode button (page 10)