Physical proof obligations

A physical claim is only as good as its instrument, its calibration and its record form. These are the obligations a physical result would have to meet. No measurement value appears anywhere on this page, because none has been supplied.

Numeric tolerances are deliberately absent. A tolerance set by this estate would be a fabricated figure. Each obligation requires the examining protocol to declare its tolerance before measurement begins, so the bound cannot be chosen after the result is known.

Dimensional fidelity of the physical object

BW-PO-001

NO CARRIER SUPPLIED

Instrument class

Calibrated dimensional measurement instrument, calibration record required.

Tolerance rule

Tolerance is declared by the examining protocol before measurement, and is not set after seeing the result.

Record form

Per-measurement record carrying value, instrument identity, calibration reference, operator, date and the raw instrument output.

Would falsifyA published value whose instrument identity or calibration reference cannot be produced.

Mass or equivalent measure of the object

BW-PO-002

NO CARRIER SUPPLIED

Instrument class

Calibrated balance or equivalent, with range covering the object and a stated resolution.

Tolerance rule

Tolerance fixed in advance as an absolute bound, with the resolution of the instrument stated.

Record form

Repeated measurements with raw output retained, plus the calibration reference and the operator.

Would falsifyA mass claimed to a precision the instrument cannot resolve, or a single measurement with no repeat.

Energy or input accounting for a declared process

BW-PO-003

NO CARRIER SUPPLIED

Instrument class

Metering appropriate to the input, with the metering point and boundary stated.

Tolerance rule

The accounting boundary is declared before measurement, and gains outside that boundary are counted against the claim.

Record form

Time series of input and output, with the boundary diagram, the metering point and the calibration reference.

Would falsifyAn efficiency or output claim whose accounting boundary excludes a known input.

Environmental conditions during measurement

BW-PO-004

NO CARRIER SUPPLIED

Instrument class

Temperature and humidity logging, logged for the full measurement window.

Tolerance rule

A declared window for each condition, agreed before the run; excursions outside it invalidate the run.

Record form

Continuous log with timestamps, covering the whole measurement window without gaps.

Would falsifyA measurement published with no condition log, or with a log that has gaps during the run.

Why an obligation is not a result

An obligation states the shape a credible record takes. It says nothing about whether the measurement was taken. Publishing the obligation is useful because it makes a future record checkable, and because it shows what is still absent rather than letting silence read as agreement.

BW Proof is an evidence estate, not a live BW runtime, not a certification, and not an independent audit. Nothing here substitutes for an examiner inspecting real artefacts.