MTS Series 793 - Manual (Page 141)

Displacement Sensor Calibration
MTS Series 793 Tuning and Calibration Calibration Procedures 141
3. Evaluate the mid-displacement position for the actuator.
Standalone FlexTest SE Controllers:
A. Enable the front panel Dial.
B. Use the Dial to increase the Setpoint adjustment for a positive
command.
Select Status > Setpoint
C. Adjust the Setpoint to fully extend the actuator and note the
displacement signal value.
D. Adjust the Setpoint to fully retract the actuator and note the
displacement signal value.
Automated Controllers:
A. Move the Manual Cmd slider to apply a positive command (extend
the actuator).
B. Adjust the Manual Cmd slider to fully extend the actuator and note the
displacement signal value in the Station Signals panel.
C. Adjust the Manual Cmd slider to fully retract the actuator and note the
displacement signal value in the Station Signals panel.
The noted displacement signal values should be within 1% of each other.
If these displacement signals are not within 1%, you can evaluate the
following procedures to establish the zero reference:
• Use the Fine Zero adjustment to shift the sensor conditioner’s zero
reference position.
Standalone FlexTest SE Controllers: Select Setup > Disp >
Calibration > Fine Zero
Automated Controllers: Adjust Fine Zero on the Calibration tab.
Note Some conditioners have two zero adjustments (coarse and fine). Try to
calibrate zero using only the Fine Zero control whenever possible. Using
the Coarse Zero control affects the signal before the post amp stage of
the conditioner and may require additional Gain adjustments.
• In some cases, a mechanical adjustment may be necessary to center the
LVDT (for instructions, see the actuator product manual).