Public evidence

engineering.msa.hysteresis

Machine-checked verification for calculation version 1.0.0 · tier engine_tested

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Verification

8/8 calculation tests · Production surface contract 4/4

Golden tests 0 / 0
Boundary tests 5 / 5
Property tests 3 / 3
Production surface contract 4 / 4
Engine tested Yes
Source checked Yes
Artifact integrity PASS
Production attestation Embedded snapshot: unpublished · Build schema 1.0.0 ready · Semantic contract ✓ · Attestation report not published on origin · Live production status STALE (1 capability; 156 remain CURRENT) @ 2026-09-14T03:54:53.650Z
Semantic contract PASS
Evidence attested at 2026-09-14T00:43:05.498Z
Last production check 2026-09-14T00:43:05.498Z
Public / cache —
Origin —
Supplemental domain review Not performed
Named expert review Not performed

release artifacts aligned PASS
schema valid input executes PASS
engine success output validates schema PASS
schema rejects incomplete input PASS

Fingerprint sha256:b634e7051166eaf150ddc82867a3f461e27e01d7d0fb4dfb6d48767da5846b54

Input schema sha256:629ef1b645a802b27d191bd3564c170f1221795f8acd7fa679ce17955ece99c2 · Output schema sha256:7d72b54ae4ea5c131ff694ba735e95c04a149f46d54e6e5351274e5a14ffeba8 · Build-time SHA-256 digests prove published artifacts agree with each other (release_integrity.scope=workspace). Production attestation GETs canonical URLs twice (public/cached view and origin), including Capability HTML, via npm run attest:production --write (published at /.well-known/calculatorx-production-attestation.json) and fails if the public Capability page advertises a different calculation_version. This is artifact consistency, not an independent immutable release log.

Build & scope

Engine identity and declared limitations.

Tool: hysteresis
Engine: hysteresis
Engine build: 2026-09-15
Evidence core: 2026-09-15T22:49:35.937Z
Rendered: 2026-09-15T23:38:12.912Z
Last reviewed: —

Assumptions

VIM 4.17 hysteresis as max |y_up − y_down| at index-paired stations
n≥2; pairing is by index, not interpolated vs xref
Not OLS linearity, not a %Hysteresis verdict, and not AIAG GRR

Limitations

Maximum paired |y_up − y_down| — not a %Hysteresis / process-variation verdict
Not OLS of ε versus xref (Linearity) and not a single-shot measurement error
Does not take T and does not issue pass/fail
n≥2 index-paired points; not AIAG GRR

Sources

Standards and references supporting this tool specification. Methods are listed separately — they are algorithms, not bibliographic sources.

JCGM 200:2012 — International vocabulary of metrology (VIM) — 4.17 hysteresis
Supports: Difference of indication when the measured quantity is approached from opposite directions.

Published checks

Golden, boundary, and property cases included in this evidence build.

ID	Kind	Status	Detail
`boundary-hyst`	boundary	pass	Expected n=3 · hysteresis=1 · Actual n=3 · hysteresis=1 · mean_abs=0.3333333333333333
`boundary-hyst-zero`	boundary	pass	Expected n=3 · hysteresis=0 · Actual n=3 · hysteresis=0 · mean_abs=0
`boundary-hyst-n1`	boundary	pass	Expected VALUE_OUT_OF_RANGE · Actual VALUE_OUT_OF_RANGE
`boundary-hyst-len`	boundary	pass	Expected INVALID_INPUT · Actual INVALID_INPUT
`boundary-hyst-missing`	boundary	pass	Expected MISSING_REQUIRED_INPUT · Actual MISSING_REQUIRED_INPUT
`property-hyst`	property	pass	1
`property-hyst-zero`	property	pass	0
`property-hyst-alias`	property	pass	1