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The change in specimen length divided by the original length. Strain is a real channel. You normally use an extensometer to measure strain, where the extensometer has a specific gauge length. The testing system uses the deflection of the extensometer divided by the gauge length to calculate the strain.
Tensile strain
Tensile strain is a composite channel. You can choose any strain channel as a source channel for tensile strain. If your source channel is an extensometer, you can choose to remove the extensometer during a test; from this point tensile strain measurement continues using the extension channel as the source. Tensile strain increases as the specimen stretches. The tensile strain channel is available in the following test types: Tension, Tension Creep Relaxation, Tension Test Profile, and Metals.
Balance
Resets the current transducer value of load or strain to zero by removing offsets due to minor electrical or mechanical changes. For example, the change in weight of a new upper grip can cause slight changes in the load signal. The load balance procedure resets the load signal to zero.
limits
The selected boundaries to which the system can drive the crosshead. You can set physical limit stops on the load frame to limit crosshead travel, and you can set electrical limits in the software for each transducer. Limits are set as safety measures to prevent overtravel or overloading.
Block shape
The type of waveform or ramp for the active block. When you select a different block shape, the Block Parameters tab at the bottom of the screen changes to show the appropriate parameter requirements you must set for the selected block shape.
Compressive stress
Compressive stress is a derived channel calculated as compressive load divided by the cross-sectional area of the specimen. Compressive stress increases as the load on the specimen increases. The compressive stress channel is available in the following test types: Compression, Compression Creep Relaxation, and Compression Test Profile.
Jog Controls
Buttons and a thumbwheel on the control panel that move the crosshead up or down manually. You use the jog keys and thumbwheel to manually position the crosshead; for example, when you install a specimen.
Rate ramp
The rate at which the ramp reaches the endpoint value. This parameter is available when you select Rate under the Ramp Setup section on the Block Parameters tab. You can specify endpoints of any of the control mode channels or time.
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