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Public evidence

electrical.pcb.trace_width

Machine-checked verification for calculation version 1.1.1 · tier expert_verified

Open calculator API Capability Download JSON CVP Manifest MCP Review policy

CVP: CVP VERIFIED · CVP protocol 1.0.0-proposed · Engineering assurance· IPC-2221 chart model — not IPC-2152; u_* deferred · Protocol · Schema · Production report

Declared partition coverage
PASS · 4/4 declared partitions (width-external, width-internal, current, invalid-domain)
Versions
Calculation 1.1.1 · CVP protocol 1.0.0-proposed · Evidence 2026-09-11.schema-coverage-u
Verification revision
2026-09-11.schema-coverage-u · 6/6 property · digest 5252bebde7a8

Verification

Legacy regression suite: 15/15 calculation tests · Production surface contract 6/6

Three distinct suites: educational examples on the calculator page, this legacy regression count (15/15 golden + boundary), and the CVP verification suite below. They are not the same number. Property, metamorphic, round-trip, O3, and interface statuses/checks are recorded in the CVP Manifest . SKIP (0/0) means that suite has no published vectors.

    This calculator CURRENT · Public schema 1.1.1 matches · Semantic contract ✓ · Production attested · Public/cache ✓ · Origin ✓

CVP verification suite

Protocol checks from the Evidence Manifest. Distinct from the legacy regression suite above. Verification revision 2026-09-11.schema-coverage-u. Calculation version 1.1.1. CVP 1.0.0-proposed. 3/3 golden · 5/5 CVP boundary · 4/4 invalid · 6/6 property · 1/1 cross-interface · 6/6 CVP contract. digest 5252bebde7a8.

  • Golden (oracle-backed) 3 / 3
  • CVP boundary 5 / 5
  • Invalid input 4 / 4
  • Property 6 / 6
  • Cross-interface 1 / 1
  • CVP contract 6 / 6
  • Interfaces PASS · UI (SSR) / REST / MCP
  • Interface claim ui-ssr is query-result HTML, not a live browser session.
  • Assurance Engineering
  • release artifacts aligned PASS
  • schema valid input executes PASS
  • engine success output validates schema PASS
  • schema rejects incomplete input PASS
  • schema coverage requires u PASS
  • schema rejects boundary unc k without u PASS

Fingerprint sha256:ab133c3d31e3709abb2d5806d4879effbe5694df076c67b8a033e98baea82a6c

Input schema sha256:d1e90b3da4e4ecf021381bab0a4c623086bd91906768ffafc94d8d33959bade4 · Output schema sha256:bdf90386bd1c257900163ad73f8c237dd5a9b884b32e9f2b95a0342d529a89e3 · 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
pcb-trace-width
Engine
pcb-trace-width
Engine build
2026-09-12
Evidence core
2026-09-12T08:32:37.705Z
Rendered
2026-09-16T22:03:43.715Z
Last reviewed
2026-08-10

Assumptions

  • Classic IPC-2221 closed form; not IPC-2152 charts.
  • 1 oz/ft² ≡ 1.378 mil thickness.
  • Steady current; no via heating or nearby power planes.
  • When u_* are set, first-order GUM sensitivity with independent inputs (no ρ on this page).

Limitations

  • IPC-2221 closed form only — not IPC-2152 chart interpolation
  • 1 oz/ft² modeled as 1.378 mil thickness
  • Bad mode/layer → INVALID_MODE; non-positive → VALUE_MUST_BE_POSITIVE
  • Optional u_* use GUM sensitivity on the primary result only; uncertainty_k is coverage (not IPC k)

Sources

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

Legacy published checks

Golden and boundary cases from the legacy Evidence JSON. CVP property, metamorphic, round-trip, O3, and interface statuses/checks are recorded in the Manifest — including SKIP when a suite has no vectors.

IDKindStatusDetail
external-10agoldenpassExpected width_mil=283.2319087512239 · I=10 · k=0.048 · Actual mode=width · layer=external · I=10 · width_mil=283.2319087512239 · width_mm=7.194090482281086 · area_mil2=390.29357025918654 · dT=10 · copper_oz=1
current-roundtripgoldenpassExpected I=10 · Actual mode=current · layer=external · I=10 · width_mil=283.2319087512239 · width_mm=7.194090482281086 · area_mil2=390.2935702591865 · dT=10 · copper_oz=1
internal-widergoldenpassExpected width_mil=736.8107715863429 · k=0.024 · Actual mode=width · layer=internal · I=10 · width_mil=736.8107715863429 · width_mm=18.71499359829311 · area_mil2=1015.3252432459805 · dT=10 · copper_oz=1
missing-IboundarypassExpected MISSING_REQUIRED_INPUT · Actual MISSING_REQUIRED_INPUT
zero-dTboundarypassExpected VALUE_MUST_BE_POSITIVE · Actual VALUE_MUST_BE_POSITIVE
bad-layerboundarypassExpected INVALID_MODE · Actual INVALID_MODE
boundary-external-10aboundarypassExpected width_mil=283.2319087512239 · k=0.048 · Actual mode=width · layer=external · I=10 · width_mil=283.2319087512239 · width_mm=7.194090482281086 · area_mil2=390.29357025918654 · dT=10 · copper_oz=1
boundary-unc-I-dTboundarypassExpected width_mil=283.2319087512239 · Actual mode=width · layer=external · I=10 · width_mil=283.2319087512239 · width_mm=7.194090482281086 · area_mil2=390.29357025918654 · dT=10 · copper_oz=1
boundary-unc-k-without-uboundarypassExpected INVALID_INPUT · Actual INVALID_INPUT
property-widthpropertypass10A external width
property-roundtrippropertypasswidth→I round-trip
property-internalpropertypassinternal wider
property-more-Ipropertypass2I → wider
property-uncertainty-composepropertypassu_* → sensitivity U on width_mil
property-no-unc-omitpropertypassno u_* → no uncertainty object