ARES-G2 Getting Started Guide Page 20
Transducer
The ARES-G2 utilizes a Force Rebalance Transducer (FRT), shown below, to measure torque and normal
force generated by the sample.
Figure 8 ARES-G2 linear transducer.
The FRT consists of independent rotational (torque) and axial (normal force) servo control systems. Each
of these systems uses position feedback to maintain the FRT shaft in a constantly null position. When a
torque or normal force is applied to the FRT shaft, the servo control systems respond by driving the
required current through the torque and normal force motor coils to maintain the shaft null position. The
electrical currents required to maintain these null positions are proportional to the amount of torque and
normal force applied to the shaft. Sense resistors sample these currents, and the resulting voltages are
scaled to provide the torque and normal force signal outputs of the transducer.
Selection and control of torque range is performed using the TRIOS software.
For normal force, full-scale measurements can be made in both the upward and downward directions. The
weight of the shaft and geometry does not reduce the measurement range in the downward direction.
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