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ASME B89 Technical Report 1990 with Errata 2002 — Errata to Dimensional Metrology Technical Report
📐 The ASME B89 Technical Report (1990 edition) is a technical-report-type document issued by the ASME Standards Committee B89 on Dimensional Metrology. Unlike formal standards, technical reports clarify the background, methodology, and best practice of a metrology topic and serve as reference for standards development and engineering application. The document described in this article is the 1990 report combined with the errata formally issued by the committee in 2002, which correct errors in numerical references, formula expressions, and tabular data of the original report. Anyone who cites the report must incorporate the errata into their own copy before using it in measurement-scheme design or uncertainty estimation.
💡 A technical report is not a mandatory standard, but its errata carry the same corrective force as errata to a formal standard: the errata issue date is the effective date, and users are expected to apply the corrections to the copies they hold.
1. Background: B89 Technical Reports and Their Purpose 📌
The B89 committee develops, under ANSI-accredited procedures, a standards system covering the testing and measurement methods of geometric parameters such as diameter, length, flatness, parallelism, coaxiality, and perpendicularity. Beyond the formal standards, the committee publishes “technical reports” that capture topical conclusions arising from its work — for example, measurement uncertainty evaluation, measurement environment control (temperature and humidity), and performance test methods for specific instruments. These reports feed directly into future standards development.
The 1990 report was issued at a pivotal moment in dimensional metrology, when the discipline was moving from simple gage comparison toward modern, uncertainty-based analysis. During subsequent review, some formulas, constants, and tabulated values in the report were found to contain typographical or computational errors, and the committee issued the 2002 errata to correct the affected pages, clauses, and equations. Copies that carry a “REAFFIRMED” statement or errata pages must be read with the corrected content prevailing.
⚠️ Errata are normally published in the format “page + location (clause/table/equation number) + corrected content.” Verification must be done item by item: never correct only the tables while leaving the body text, and do not assume that every errata item applies to your usage scenario.
2. Categories of Corrections and Their Impact 🔧
Following ASME’s customary practice for issuing errata, the 2002 corrections to the 1990 technical report fall into the categories summarized below. The table lists each correction type with its typical content and its engineering impact:
| Errata Category | Typical Correction Content | Impact on Users |
|---|---|---|
| Formula corrections | Fix variable order, symbols, or coefficients in equations (e.g., cosecant/cotangent terms) | Directly changes computed results; recalculate anything derived from the formula |
| Numerical corrections | Fix tabulated values (decimal places, exponents, etc.) | Affects uncertainty or tolerance judgments; verify against source data |
| Table corrections | Correct individual entries in one column of a multi-column table | Prevents lookup errors; mark the changed position |
| Text and typography | Correct clause numbers, cross-references, or spelling | Affects clause traceability; update contents and citations |
🚨 It is strictly prohibited to continue issuing metrology reports using uncorrected data after an errata has been confirmed to exist — this can produce wrong measurement judgments and quality risks. Once issued, the errata is considered effective, and the effective date is ASME’s official publication date.
3. Obtaining and Managing Errata in Engineering Practice 🛠️
- 📥 How to obtain errata: ASME publishes errata through its committee pages (C&S Connect / cstools.asme.org) and supports e-mail subscription to “Errata” update notifications. Users should periodically check the errata status of the standards and technical reports they hold.
- 📝 Version management: in a controlled-document system, the errata pages should be archived as an attachment to the original document, and the file register should note “with 2002 errata” so version traceability is available for audits and certification.
- 🔬 Impact assessment: for formula and numerical errata, return to the original measurement data-processing flow and recalculate; where necessary, re-verify the calibration results and uncertainty budget of the affected gages, and assess whether the correction changes conclusions.
- 🏭 Training and handover: fold the errata content into training material for metrology staff and document controllers so that outdated values are not carried forward into internal standards, work instructions, or purchasing technical requirements.
- 🔍 Full verification: even if you use only part of the report, verify all errata items — corrections cross-reference each other (a formula correction can affect later tables), and checking only local items can miss indirect effects.
✅ Good practice: maintain a “standard/technical-report status ledger” that lists, for every referenced document, the base edition, the errata/addenda applied, the effective dates, and the responsible owner. This single register answers most audit and traceability questions about dimensional metrology documents.
4. Frequently Asked Questions ❓
❓ Q: Is errata to a technical report the same in nature as errata to a formal standard?
A: Yes, in nature. ASME corrects published content in both formal standards and technical reports through errata, and the errata issue date is the effective date; the only difference is that the technical report itself is not a mandatory regulatory requirement.
A: Yes, in nature. ASME corrects published content in both formal standards and technical reports through errata, and the errata issue date is the effective date; the only difference is that the technical report itself is not a mandatory regulatory requirement.
❓ Q: I use only part of the report — do I need to check only the errata for that part?
A: You may, but full verification is recommended. Errata items cross-reference one another (a formula correction may affect later tables), so checking only local items can miss indirect effects.
A: You may, but full verification is recommended. Errata items cross-reference one another (a formula correction may affect later tables), so checking only local items can miss indirect effects.
❓ Q: How can I confirm that my copy already includes the 2002 errata?
A: Check whether the file contains an errata page or a combined-edition statement. For controlled documents, obtain the errata list from the issuing body and verify; for electronic copies, compare against the latest errata published on the ASME website.
A: Check whether the file contains an errata page or a combined-edition statement. For controlled documents, obtain the errata list from the issuing body and verify; for electronic copies, compare against the latest errata published on the ASME website.
🔍 Q: Must historical measurement data be retroactively corrected after an errata?
A: It depends on the impact. If the errata changes a value or formula used to judge conformance, perform an impact assessment on the affected period’s batch records and, where necessary, re-issue conclusions with a documented explanation.
A: It depends on the impact. If the errata changes a value or formula used to judge conformance, perform an impact assessment on the affected period’s batch records and, where necessary, re-issue conclusions with a documented explanation.
