MTS Series 793 - Manual (Page 204)

MTS Series 793 Tuning and Calibration
Extensometer Calibration
Calibration Procedures 204
Note It is up to the user to establish whether the recorded data points meet the
required accuracy. Typically, 1% of a reading is the normal accuracy
specification.
If they do not, you must go back to recalibrate the extensometer negative
and positive outputs.
Note The Gain/Linearization Calibration procedure that follows applies only to
controllers equipped with full-range conditioners (e.g., Model 493.25
DUC module).
Task 5 Gain/Linearization Calibration
If you are using Gain/Linearization for your calibration type, complete the
following procedure. If not, complete Task 4 Gain/Delta K Calibration on
page 201.
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.
Calibration setup 1. Ensure that the extensometer is properly attached to the calibrator frame
using the associated installation drawings and calibrator fixtures.
2. Set an initial transducer excitation voltage.
Standalone FlexTest SE Controllers: Select Setup > Strain > Calibration
> Cal Type > Gain/Linearization > Excitation (peak)
Set the Excitation (peak) voltage value (typically 5- 8 volts).
Automated Controllers:
A. In the Station Setup window’s navigation pane, locate and select the
Channels resource providing the strain feedback signal.
B. In the Station Setup window, click .
C. In the Inputs panel, click the Calibration tab.
D. Set Type to Gain/Linearization.
E. Set Excitation (peak) voltage value (typically 5- 8 volts).
3. If the extensometer uses a zero pin, remove the zero pin now.
4. Monitor the extensometer’s amplified output (strain).