The "known" is the original calibration of the instrument


To separate the concepts of "calibration" from "control checks"

To clarify that "calibration" is something that happens at the factory, not at time of use by a qualified technician

To clarify that control tests at time of testing are simply a verification (to use the CFS scientist's words) that calibration hasn't changed over time (note Hodgson concept of "over time" in his paper referred to in St-Onge)

#calibration #controltest #verification #overtime

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