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SNUADC step-mode correction size

True size of a step-mode correction, from the pacing train on stamp time.
Value about 0.498 s true (paced: 0.4981–0.4988 s); −0.480 s on the stamps
Status measured: Measured in a study.
From Paced ECG as an independent clock
About SNUADC (step mode) against the recorder PC
Date 2026-10-17

Notes

Four numbers describe the same reset. The stamps step back −0.4804 s (SD 0.7 ms) at every one of the 3,417 resets in the release (When each device's clock is corrected, in every recording); adding the 17.7 ms never sampled (Signal lost at a SNUADC step-mode correction) gives the true 0.498 s seen in the pacing train. The correction scan's −0.487 s (0.484–0.492 s) is measured from the start of the preceding run, so it also holds the −0.954 ppm stamp arithmetic built up over that run, 5.9 ms over the median run of 6,198 s (Clock corrections in every file). The 0.49 s quoted as the trigger is the drift at which the reset falls, rounded.

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