Series
1000 Proving Rings
The extremely low uncertainty and high-resolution capability of the
Series 1000 Proving Ring has never been equaled by any other secondary force
standard. Every Series 1000 proving
ring is calibrated by primary standards with direct trace ability to the
National Institute of Standards and 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 trace ability preferred.
The uncertainty of the series 1000 proving ring is 0.0125% of capacity.
For example in a proving ring of 1000 pound-force capacity, the
uncertainty would be 0.125 pound-force.
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 in 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 electrical read vibrator, a dial revolution counter, a vernier index, a carbide micrometer contact to minimize wear and a ball seat in the top boss.