MTS Series 793 - Manual (Page 131)

Displacement Sensor Calibration
MTS Series 793 Tuning and Calibration Calibration Procedures 131
Considerations for
Gain/Linearization
calibrations
Gain/Linearization calibrations requires specific conditioner zeroing practices, as
follows:
• Before and during calibration, ensure the Manual Offset and Electrical
Zero controls on the Offset/Zero tab of the Inputs panel are set to zero.
Also, ensure the Electrical Zero Lock box is set.
• After calibration, do not change the electrical zero adjustment.
Readjustment of electrical zero after calibration will change the point at
which linearization takes place, which will disturb other calibration settings.
Range support
Full-range conditioners (e.g. Model 493.25 DUCs) do not require individual
ranges.
Ranged conditioners (e.g. Model 493.21/21B DUCs and Model 497.14 AC
Conditioners) support up to four ranges for LVDT calibration. Displacement can
be calibrated to any range within the full-scale capacity of the sensor. Also,
ranges do not have to be centered on zero.
What you will need
You will need a dial indicator gage (or for longer displacements a measuring
device such as a long ruler, laser, or optical detector) to calibrate an LVDT.
Note All calibration tools should be calibrated to an industry standard.
Note This calibration procedure calibrates the conditioner for an actuator
displacement of ±10 cm. You will need to adjust the procedure to
accommodate your actuator displacement.