Description

The extremely low uncertainty and high resolution capability of the Series 1000 proving ring has never been equalled by any other secondary force standard. Every Series 1000 proving ring is calibrated by primary standards with direct traceability to the United States National Institute of Standards & Technology. In addition, the resulting "Report of Calibration" issued by the force calibration laboratory is included with the ring. Therefore, the Series 1000 proving ring is the perfect choice for use in standards laboratories where the highest possible accuracy is required and direct traceability preferred. The uncertainty of the Series 1000 proving ring is 0.0125% of capacity. This capability results from the ring design which allows greater deflection under load than other proving rings. The increased change in diameter can be measured up to 2000 major divisions on the micrometer dial. A vernier index further improves readability to one-tenth of a major dial division and makes possible interpolation to one-twentieth of a division.

To facilitate calibrations, the Series 1000 proving rings are equipped with an electric reed vibrator, a dial revolution counter, a vernier index, a carbide micrometer contact to minimize wear and a ball seat in the top boss.