Abstract
The domestic round-robin testing for interferometric length measurements of gauge blocks was initiated in 1960 in Japan, to evaluate and also to improve the proficiency of calibration laboratories. It had been arranged by the National Research Laboratory of Metrology (NRLM) and Japan Precision Measuring Instrument Association 16 times prior to 1992. A 100 mm gauge block was used as the test object on each occasion and measurement result of the NRLM was used as the reference value. When the difference between the result of each laboratory and the NRLM was larger than 30 nm, the laboratory repeated the measurement and the reason for the discrepancy was investigated. About 10 laboratories, including those of local governments, private companies and semigovernment organizations, participated regularly and many of them maintained their proficiency in the measurement of gauge blocks.
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