EV1000 mean arterial pressure¶

Mean arterial pressure from the EV1000 platform, updated every 20 s.

Stub

Imported from the time-source table; the full page is still to be written.


Name in the dataset	`EV1000/ART_MBP`
Type	numeric
Device	EV1000
Stamped by	Recorder PC clock
Unit	mmHg

Measurement space¶

Time side (after MAP alignment): the true time lies between -22.4 s and -0.25 s from the stamp: the delay range plus the interval one value describes.

Time¶

From UTC to the stored time stamp¶

Derived from this signal's timing table; a written chain is still to come.

The clock path first (UTC to the clock that stamps or spaces the samples), then the signal's own path to its stored time. Each bar: the time shift or error the step introduces (pale) and what is left after the atlas's correction (solid), on a log scale; dashed when estimated or assumed.

UTC

The reference every chain starts from.

Recorder PC clock

sync assumed 3 ms – 900 ms · clock link, parameter

Windows time synchronisation to the hospital's time server every 8–24 h (assumed), drifting a few ppm in between. Not observable in the release: dates are shifted to 2100. No step of 0.5 s or more was found.

Recorder PC clock

clock measured 900 ms – 3.25 s → 250 ms – 2.4 s after correction

Delay or clock offset to the stamp; removed by the MAP alignment to SNUADC ART.

Stored time stamp

window measured 20 s

The width of the interval one value or sample stands for.

Timing¶

Against the working reference. Delay: from the end of the interval a value describes to its stamp. Interval: how wide that interval is.

Form	Delay	Interval	Clock domain	Status	Evidence
after MAP alignment (default)	250 ms – 2.4 s	20 s	SNUADC stamp-model time (the working reference)	measured	residual SD 0.25-2.4 s (p5-p95); three-way loop closes, median +0.13 s
as stamped	900 ms – 3.25 s	20 s	EV1000	measured	from the end of an assumed 20 s window: median 1.6 s (p25 0.9, p95 3.2; 579 cases)

Combine it with other signals in the synchronisation planner.

Value¶

Its value side is still to be described.

Studies¶

Study	Date	Status	Summary
Value resolution of every signal	2026-10-19	draft	How finely every waveform and numeric track in the release records its values. The SNUADC waveforms are 10-bit codes, though VitalRecorder's documentation describes the SNUADC as 12-bit; Primus waveforms use about 10 bits of 12; BIS EEG is a 16-bit grid of 0.05 µV. Numerics are 32-bit floats on decimal grids of 1, 0.1, 0.01 or 0.001, one per track; settings sit on coarser grids of 10 or 100.
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.

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