MRA Appendix B

CCL key comparisons (CCL-Kx)

First round of Key Comparisons, authorised by the CCL.

Number	Subject	Status	Report
CCL-K1	Gauge blocks	Complete	Final report
CCL-K2	Long gauge blocks/length bars	Complete	Final report
CCL-K3	Polygons	Complete	Final report
CCL-K4	Ring & plug gauges	Complete	Final report
CCL-K5	1D CMM artefacts	Complete	Final report
CCL-K6	2D CMM artefacts	Complete	Final report

Second round of Key Comparisons, authorised by the CCL.

(Not all future comparisons follow the classical scheme, some are operated as inter-RMO comparisons).

Number	Subject	Status	Report
CCL-K1.2009	Gauge blocks up to 500 mm	Planning	-

CCL NANO pilot studies (NANOx)

Official pilot studies using MRA guidelines, authorised by the CCL.

Number	Subject	Status	Report
NANO1	Photomask linewidth	Starts soon	-
NANO2 (CCL-S2)	Step height	Complete	Final report
NANO3 (CCL-S3)	Linescales	Complete	Final report
NANO4 (CCL-S1)	1D gratings	Complete	Final report
NANO5 (CCL-S4)	2D gratings	Complete	Final report
NANO6	SPM linewidth	Starts soon	-

EURAMET key comparisons (EURAMET.L-Kx)

New key comparisons organized by EURAMET Length and designed to link to corresponding CCL key comparisons.

Number	Subject	Project no.	Status/report
EUROMET.L-K1	Gauge blocks	471	Final report
EUROMET.L-K1.1	Gauge blocks	634	Final report
EUROMET.L-K1.2	Gauge blocks	1138	Running
EUROMET.L-K2	Long gauge blocks	602	Final report
EUROMET.L-K3.1	Optical polygons	870	Final report
EUROMET.L-K3.2009	Autocollimators	1074	Running
EUROMET.L-K4.2005	Ring & plug gauges	812	Draft B
EUROMET.L-K5-2004	1D CMM artefacts	777	Draft A
EUROMET.L-K6	2D CMM artefacts	743	Draft A
EUROMET.L-K7.2006	Linescales (up to 100 mm)	882	Draft A
EUROMET.L-K8	Roughness	1003	Running

EURAMET supplementary comparisons (EURAMET.L-Sx)

Previous and new comparisons organized and reviewed by EURAMET TC-Length as being suitable for supporting the MRA.

Number	Subject	Project no.	Status/report
EUROMET.L-S1	Linescales	252	BNM/LNE, 1995
EUROMET.L-S2	Thermal expansion of gauge blocks	275	Metrologia paper Final report
EUROMET.L-S3	Depth setting standards	301	Final report
EUROMET.L-S4	Wires (diameter)	308	Final report
EUROMET.L-S5a	Roundness	BCR	Final report
EUROMET.L-S5b	Roundness	361	Final report
EUROMET.L-S6	Thermal expansion of long gauge blocks	390	PTB report
EUROMET.L-S7	Surface plates	BCR	EUR 14059 EN, 1992
EUROMET.L-S8	Nd YAG lasers	Bilateral	Final report
EUROMET.L-S9	Grid plates	BCR 3442	3442/1/0/189/91/7
EUROMET.L-S10	Squares	570	Final report
EUROMET.L-S11	Surface texture	600	Metrologia paper Final report (6MB)
EUROMET.L-S12	Gauge blocks by comparison	601	Final report
EUROMET.L-S13	Cylindrical artefacts	369	Final report (PTB)
EUROMET.L-S14	Steel tapes	677	Final report
EUROMET.L-S15	Step height standards by SPM	707	Final report
EUROMET.L-S15a	Step height standards by SPM	925	Final report
EUROMET.L-S16	Gauge blocks by comparison	797	Final report
EUROMET.L-S17	Steel tape, trilateral (link to S14)	875	Final report
EUROMET.L-S18	Granite square, bilateral (link to S10)	905	Final report
EUROMET.L-S19	Steel cylindrical square, bilateral (link to S10)	910	Final report

EURAMET/EUROMET bi-lateral comparisons

New bilateral comparisons for equivalance purposes, organized and reviewed by EURAMET/EUROMET TC-Length as being suitable for supporting the MRA. These are comparisons which link to previous key or supplementary comparisons.

Number	Subject	Project no.	Status
None	Indexing tables (bilateral) MRA bilateral, link to L-K3.PREV	725	Running

Previous EUROMET key comparisons (EUROMET.L-Kx.PREV)

Existing Comparisons in the same subjects as the CCL-Kx series, reviewed by EUROMET Length as being suitable for the interim MRA.

Number	Subject	Project no.	Report
EUROMET.L-K1.PREV	Gauge blocks	229	Final report
EUROMET.L-K2.PREV	Long gauge blocks/length bars	254	Final report
EUROMET.L-K3.PREV	Polygons	371	Final report (PTB)
EUROMET.L-K4.PREV	Ring & plug gauges	384	Final report
EUROMET.L-K5.PREV	Step gauge	372	Final report (PTB)

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