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The NIST primary force standards consist of six machines for applying discrete forces generated by stainless steel deadweights, spanning a range of 44 N to 4.
9) with the extremes of the ranges for the barometric pressure, air temperature, and relative humidity as given above, the average, minimum, and maximum values for the air density in the vicinity of the NIST deadweights are obtained as 1.
This program includes diligent mechanical inspection and maintenance of the deadweights and associated loading mechanisms.
The uncertainty of the realization of force for the national deadweight force standards at NIST is discussed, as well as the uncertainties associated with NIST's voltage-ratio measuring instruments and with the characteristics of transducers being calibrated.
Key words: calibration; deadweight force standard; expanded uncertainty; force; gravity; mass; transfer standard; metrology; uncertainty.
The NIST deadweight force standards exert force by means of the earth's gravitational attraction acting upon weights of calibrated mass.
448 MN, NIST developed six deadweight machines in which discrete forces are generated by deadweights.
The deadweights of all NIST deadweight machines are made of stainless steel.
Originally, actuation of the deadweights of the 113 kN and 2.
Air-powered cylinders manipulate lifting bars that allow the individual deadweights to be applied or removed from the main shaft of the machine at any time during the measurement.
Hydraulic cylinders raise and lower the deadweights individually onto the main shaft, usually only while the machine is in the unloaded position.
A manually placed set of auxiliary metric conversion deadweights is available for this machine, which produces nominal forces in 4.