Calibrating an LVDT
Model 493.02 Controller Service
Calibration
119
Task 7 Gain/Linearization Calibration
If you are using Gain/Linearization for your calibration type,
complete the following procedure. If not, complete Task 6 Gain/Delta
K Calibration on page 114.
Important Using linearization data requires specific conditioner zeroing
practices. Ensure that Electrical Zero Lock on the Offset/
Zero menu is set to Locked. Adjusting electrical zero after
calibration may invalidate linearization data.
Initial LVDT
calibration
For initial calibration of an LVDT complete the following procedure:
1. Select Gain/Linearization for Cal Type.
Stand-Alone— Path: Setup > Disp. > Calibration > Cal Type >
Gain/Linearization
Automated— Select Gain/Linearization for Cal Type on the
Calibration tab of the Inputs panel.
2. Apply a retraction command that is 80% of the full scale range.
Stand-Alone:
A. Enable the front panel Dial.
B. Use the Dial to adjust the Setpoint for 80% of the full scale
range.
C. Verify that your LVDT displacement signal equals 80% of the
full scale range.
Automated:
A. Open the Manual Command window, and then click on the
Enable Manual Command.
B. Adjust the Manual Cmd slider on the Manual Command
window for 80% of the full scale range.
C. Use the Station Signals panel to verify that your LVDT
displacement signal equals 80% of the full scale range.
During the initial calibration and tuning of your system, it may
take repeated adjustment for the two values to match.
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