USAGE SCENARIOS
CYCLICAL TESTING
In this type of test, the Record Sequence button can be used to acquire a full sequence. Be sure that the specimen is in a
stable-repeating mode before you start acquiring; acquire your sequence using whichever step you desire. You may wish to
acquire multiple sequences for a given test; this will help determine whether a very weak response is actually a response, or
only noise.
You can repeat the test at different frequencies; be sure to let the system stabilize, if necessary, after a frequency change.
You can also record a slow sweep, by clicking the Auto phase button and putting the system in Streaming capture mode.
The sweep should be kept slow because the delay for each pulse is determined from the previous cycle’s frequency.
For cyclical testing, a decision needs to be made about the reference image. You can take a reference image of the system
in a static/resting state in order to see strains and displacements relative to that state, or, you can select one of the moving
phase images (such as the 0º image) as the reference to see results relative to this phase of the motion.
FATIGUE TESTING
For this scenario, the phase stepping will generally not be used. Simply select the phase at which to take images – this
phase is indicated by the red line on the scope display, so you can easily choose the minimum or maximum load, or a zero
state, if you have a load or displacement signal. For example, here, the phase is set to record approximately at the
maximum load:
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