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Public evidence

electrical.pcb.diff_impedance

Machine-checked verification for calculation version 1.0.0 · tier internally_reviewed

Open calculator API Capability Download JSON CVP Manifest MCP Review policy

CVP status

CVP VERIFIED · CVP protocol 1.0.0-proposed · Engineering assurance

Edge-coupled microstrip; S is edge-to-edge gap; H is dielectric height from trace to reference plane; zero copper thickness; homogeneous dielectric; no soldermask; no dispersion/roughness/weave.

Declared partition coverage
PASS · 5/5 declared partitions (zdiff-wide, zdiff-wh-eq-1, zdiff-narrow, invalid-domain, metamorphic)
Versions
Calculation 1.0.0 · CVP protocol 1.0.0-proposed · Evidence 2026-09-13.cvp-self-consistency
Verification revision
2026-09-13.cvp-self-consistency · 4/4 property · digest 182774947424

Verification

Legacy regression suite: 12/12 calculation tests · Production surface contract 6/6

Three distinct suites: educational examples on the calculator page, this legacy regression count (12/12 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 1.0.0 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 2026-09-13.cvp-self-consistency. Calculation version 1.0.0. CVP 1.0.0-proposed. 4/4 golden · 5/5 CVP boundary · 9/9 invalid · 4/4 property · 2/2 metamorphic · 2/2 cross-interface · 2/2 cross-calculator · 4/4 CVP contract. digest 182774947424.

  • Golden (oracle-backed) 4 / 4
  • CVP boundary 5 / 5
  • Invalid input 9 / 9
  • Property 4 / 4
  • Metamorphic 2 / 2
  • Cross-interface 2 / 2
  • Cross-calculator 2 / 2
  • CVP contract 4 / 4
  • Interfaces PASS · UI (SSR) / REST / MCP
  • Interface claim ui-ssr is query-result HTML, not a live browser session. Error-path engine·REST·MCP 1/1 (status, code, calculation_version). SSR compared on URL-canonical requested calculations; empty query is idle (not an error) and JSON-typed object/array inputs are REST/MCP-only.
  • Assurance Engineering
  • release artifacts aligned PASS
  • schema output required declared PASS
  • schema valid input executes PASS
  • engine success output validates schema PASS
  • schema rejects incomplete input PASS
  • rest success payload validates schema PASS

Fingerprint sha256:616e85a5eca1c2d25b7f069f5fe2e6412da475cc6a14d094d89eba4ad18b8fdd

Input schema sha256:e81d3eefa501cc0d2222e7a0a1f38ec7865abeb040659a7376d526f25b930650 · Output schema sha256:0dbbec43e2eef498f984eaf82ba16410b6a6dae68847ad33a5fc3d61adc3467a · 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-diff-impedance
Engine
pcb-diff-impedance
Engine build
2026-09-12
Evidence core
2026-09-12T22:29:20.477Z
Rendered
2026-11-10T05:18:41.756Z
Last reviewed
2026-09-13

Assumptions

  • Zero copper thickness (T=0)
  • Homogeneous dielectric; no soldermask
  • Edge-coupled pair; S is edge-to-edge gap
  • H is dielectric height from trace to reference plane
  • No dielectric dispersion, copper roughness, or weave

Limitations

  • Zero copper thickness (T=0); homogeneous dielectric; no soldermask
  • S_m is edge-to-edge gap, not center-to-center
  • Not a field solver; omits dielectric dispersion, copper roughness, and weave

Sources

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

Verification disclosure

Aggregate outcomes, scope and artifact commitments are public. Complete test inputs, expected values, execution records and oracle infrastructure are retained privately. This summary does not independently reproduce the full verification run.