MTS Systems FlexTest SE Service Information

Shunt Calibration
Model 493.02 Controller Service
Sensors
89
Shunt Calibration
You can verify the calibration accuracy of a DC sensor/conditioner pair
through shunt calibration. Shunt calibration works by shunting a
precision resistor across one arm of the sensor’s bridge.
A current shunt calibration value, taken before a test, should be
compared to the shunt calibration reference value recorded when the
sensor was last calibrated. If the reference value and the current value
differ too greatly, the sensor/conditioner pair should be recalibrated to
establish a new shunt reference value.
Note It is possible to adjust excitation to compensate for small to
moderate changes in the shunt calibration value.
When to use shunt
calibration
You should perform a shunt calibration (establish a new shunt
reference value) when the following occur:
• You start a new test.
• You move a sensor to a different DC conditioner.
• You swap a DC conditioner module.
• You recalibrate a DC sensor.
• You change the sensor cable (resistance may differ).
Note Shunt calibration can not be used to compensate for different length
cables.
Note You cannot check shunt calibration of a sensor being used with the
active control mode when hydraulic pressure is on.
Note Shunt calibration does not compensate for changes in the sensor
sensitivity over time.
How to perform a
shunt calibration
Each resistive bridge type transducer (DC sensor) uses a shunt resistor
to check the calibration accuracy of the sensor/conditioner
combination. Each DC conditioner supports a shunt resistor.
Perform a shunt calibration to establish a new shunt reference value
for a DC sensor/conditioner pair as follows:
1. Turn off hydraulic power
2. Remove the load standard.

MTS Systems FlexTest SE Specifications

General

Brand	MTS Systems
Model	FlexTest SE
Category	Controller
Language	English