MTS Series 793 - Manual (Page 202)

Description Item
Restore is disabled if the input signal does not have a sensor file assigned or
the input signal control mode is the active feedback with the system hydraulics
on.
Shunt Calibration
About Shunt Calibration Checks
A shunt check verifies the calibration accuracy of a sensor/conditioner pair. Only DC conditioners with bridge
circuits require shunt checks.
When to perform shunt calibration
Whenever you start a new test or exchange a DC conditioner module, you may want to perform a shunt check
and compare the Current Shunt Value to the saved Shunt Reference Value. Recalibrate the sensor if the two
values differ by more than 20 mV.
How it works
When you perform a shunt check, a precision shunt-calibration resistor is placed across the transducer bridge
producing a known offset. This offset is used to determine a “shunt voltage” that appears in the Current Shunt
Value box.
Shunt calibration resistors
You must always use the same shunt-calibration resistor that was initially used to determine the shunt reference
value for a particular sensor. If you use a different resistor, the shunt-calibration results for that sensor are
invalid.
202 MTS Series 793 Control Software
Station Setup