electrical.pcb.trace_width

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 2026-10-28.meta-metrics-v2. Calculation version 1.1.1. CVP 1.0.0-proposed. 3/3 golden · 5/5 CVP boundary · 4/4 invalid · 6/6 property · 2/2 metamorphic · 1/1 cross-interface · 8/8 CVP contract. digest f6be7d637320.

• Golden (oracle-backed) 3 / 3
• CVP boundary 5 / 5
• Invalid input 4 / 4
• Property 6 / 6
• Metamorphic 2 / 2
• Cross-interface 1 / 1
• CVP contract 8 / 8
• 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 output required declared 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
• rest success payload validates schema 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.

Tool

pcb-trace-width

Engine

pcb-trace-width

Engine build

2026-09-12

Evidence core

2026-09-12T08:32:37.705Z

Rendered

2026-11-10T05:18:41.724Z

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)