A rod, mounted on the load frame that is driven up or down using servohydraulic force. The force required to drive the actuator is transferred to the specimen through the grips. Actuator applies to servohydraulic systems only. Note that the crosshead is fixed during a test on a servohydraulic system.
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WaveMatrix™2 Brochure

WaveMatrix2 is intelligent software designed for fatigue and dynamic testing of materials and components. It delivers flexibility - run everything from a simple static ramp, to cyclic waveforms through to complex multi-step, multi-axial tests The highly visual environment with integrated tabular screens, clear menu structures, time-based matrix test preview and configurable live test workspace is designed to be intuitive and instill confidence. Packed with intelligent features, such as data reduction and built-in project organization, designed to simplify your testing.