Skip to content

CardioQ clock

The CardioQ's own clock; the recorder re-anchors its stamps about every 5 minutes.

Stub

Imported from the time-source table; the full page is still to be written.
Type oscillator
Nominal Waveform sample clock
Kept by CardioQ

Description

The CardioQ's own clock; the recorder re-anchors its stamps about every 5 minutes.

Route to UTC

The route the atlas trusts most (2 links; its weakest link is measured apart from the link to UTC that every clock shares):

CardioQ clock
link measured CardioQ against the recorder PC: corrected every at most about 300 s; about 40 re-anchors per case
Recorder PC clock
link assumed Recorder PC against UTC: drift 0.1–10 ppm (assumed); corrected every 8–24 h (assumed)
UTC
Where every route ends.

Independent checks. 3 other routes reach UTC; where they meet, the offsets must close around the loop:

Plan. Re-anchored about every 5 minutes against the PC, and matched beat by beat to SNUADC per stretch; the three-way arterial pressure loop with the EV1000 and SNUADC closes. Enough for second-level alignment; no drift within a stretch is modelled.

Link Clock Against Modes Rate Corrected every Status
CardioQ against the recorder PC CardioQ clock Recorder PC clock all — at most about 300 s; about 40 re-anchors per case measured
CardioQ against SNUADC CardioQ clock SNUADC sample clock all — — measured

Variables spaced by this clock

CardioQ pressure and flow

Studies

Study Date Status Summary
Closing loops in the timing graph 2026-10-13 current Where two independent routes reach the same clock, the offsets around the loop must sum to zero. Three measured loops close within their noise; the BIS loop closes up to a constant latency; the proposed EMR loop is not a loop at all.
Rare devices against SNUADC 2026-10-13 current CardioQ, EV1000, Vigileo and Vigilance each get a link to the SNUADC timeline: beat matching for the CardioQ, mean arterial pressure alignment for the EV1000 and Vigileo, and a long-window fit for Vigilance's averaged heart rate.
Clock corrections in every file 2026-10-11 current A scan of all 6,388 files for the jumps where the recorder re-synchronises a device's stamps. Each device type has its own correction signature; only SNUADC and BIS correct clearly enough to measure their drift.

Tags: stub