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The simplest use case, where we have one PV with one associated data buffer. The default (and maximum) buffer size is 2800, but that can be reduced if desired. Whatever the buffer size n, we display the n most recent points as long as a kind of rolling EKG:
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This is useful for seeing erraticisms in a signal (maybe you suspect a klystron phase is wandering), or to see how it's trending (maybe you're messing with a quad and you want to see if that's increasing/decreasing/doing nothing to the pulse intensity).
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