MTS WIFT Mini Transducer Interface - Manual (Page 23)

Calibration
SWIFT ® Mini TI Hardware Overview 23
When you press the Shunt button, the associated Shunt indicators toggle while
the shunt is in progress. As the TI automatically switches through the series of
bridges, it verifies that the outputs are within the accepted tolerance range. If all
bridge shunt values fall within the tolerance range, the Shunt indicators on the
front panel will go off (after several seconds). If any bridge fails the shunt test,
the red, fail indicator lights, indicating that the shunt calibration has failed. The
fail indicator remains lit until a shunt check passes or until you cycle power off
and on. Use the TI2STATUS utility to get more detailed information about the
shunt failure.
Example of Calibration File Shunt Data
The above example shows shunt data from the calibration file. This data can be
transferred, using the TI2XFER program, from the transducer interface memory
to a computer or from a computer to the transducer interface memory. Note that
items marked ShuntDeltaMeas are uploaded from memory, but not downloaded
from the computer.
For more information on TI2XFER, see the chapter, “Software Utilities”.
Manual shunt
verification
You can check the system at any time by pressing the Shunt switch (described
earlier). The shunt verification checks a portion of the system by applying an
electrical offset at the input. Shunt verification can be used as a troubleshooting
tool; failing the shunt verification raises the possibility the system is not
calibrated. You can set the tolerance values for each TI by editing the calibration
file. For instructions, see
“Transducer Interface Setup” on page 41.
ShuntTolerance=2
FX1ShuntDeltaRef=-1.379
FX2ShuntDeltaRef=-1.386
FY1ShuntDeltaRef=-1.381
FY2ShuntDeltaRef=-1.378
FY3ShuntDeltaRef=-1.382
FY4ShuntDeltaRef=-1.381
FZ1ShuntDeltaRef=-1.380
FZ2ShuntDeltaRef=-1.380
FX1ShuntDeltaMeas=-1.378
FX2ShuntDeltaMeas=-1.386
FY1ShuntDeltaMeas=-1.380
FY2ShuntDeltaMeas=-1.379
FY3ShuntDeltaMeas=-1.382
FY4ShuntDeltaMeas=-1.382
FZ1ShuntDeltaMeas=-1.385
FZ2ShuntDeltaMeas=-1.382