Manual, F/T Sensor, Data Acquisition (DAQ) Systems
Document #9620-05-DAQ.indd-20
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7.1 Errors with Force and Torque Readings
Bad data from the transducer’s strain gages can cause errors in force/torque readings. These errors can result
in problems with threshold monitoring, sensor biasing and accuracy. Listed below are basic conditions of
bad data. Use this to troubleshoot your problem. In most cases, problems are easier to detect while viewing
raw strain gage data.
Table 7.1—Troubleshooting Table
Symptom Cause Resolution
Saturation
When the data from a raw decimal strain gage
reads the positive or negative maximums, that
gage is saturated. Saturation occurs if the sensor is
loaded beyond its rated maximum or in the event of
an electrical failure within the system.
Stop applying force to the transducer
and wait until the error clears to
continue. If error does not clear, it
may indicate the overload value has
been exceeded or a loss of power.
Noise
Excessive noise can be caused by mechanical
vibrations and electrical disturbances, possibly
from a poor ground. It can also indicate component
failure within the system.
Make sure the unit is grounded
properly and the area is isolated
from electrical disturbances.
Drift
After a load is removed or applied, the raw gage
reading does not stabilize but continues to increase
or decrease. This may be observed more easily
while viewing resolved F/T data. Drift is caused
by temperature change, mechanical coupling, or
internal failure. Mechanical coupling is caused
when a physical connection is made between the
tool plate and the sensor body (i.e., plastic lings
between the tool adapter plate and the transducer
body). Some mechanical coupling is common, such
as hoses and wires attached to a tool.
Make sure the tool, tool adapter
plate and the transducer body are
isolated from each other and no
debris lies between the transducer
body and tool plate.
Hysteresis
When the sensor is loaded and then unloaded,
gage readings do not return quickly and completely
to their original readings. Hysteresis is caused by
mechanical coupling (explained in drift section) or
internal failure.
Make sure the tool, tool adapter
plate and the transducer body are
isolated from each other and no
debris lies between the transducer
body and tool plate.
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