NIST WELL REPRESENTED AT THE ISO TC213 MEETING.

Two NIST scientists represented NIST at the meeting of ISO Technical Committee (TC) 213 on Dimensional and Geometrical Product Specifications (GPS) and Verification and its component Working Groups (WGs), held in June 2000, in Berlin. This committee has a wide-ranging scope encompassing dimensional and geometrical tolerancing, surface properties, dimensional measuring equipment, and calibration requirements, including the uncertainty of dimensional and geometrical measurements. In these areas, the committee produces a large number of documentary standards that affect the practice of dimensional specification and measurement in the United States. One scientist attended as a U.S. expert for WG 5 on Calibration Procedures for Surface Texture. WG5 has completed its agenda and produced four Draft International Standards within 3 1/2 years. This scientist also reported to the Main Committee as the Liaison to TC 172 on Optics and Optical Instruments. The other NIST scientist convened WG6 on General Requirements for GPS Measuring Equipment and reported to the Main Committee on the status of WG6 work. One WG6 document, ISO 14978, entitled "General Concepts and Requirements for GPS Measurement Equipment," will soon be released for a draft international standard ballot. A second document, ISO 463, dealing with the design and metrological characteristics of dial gauges, is now ready for a committee draft ballot. Both Vscientists also attended Working Group 14 on Vertical GPS Principles.