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A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens.
More generally encountered is the traditional unit of μS/cm. The commonly used standard cell has a width of 1 cm [clarify], and thus for very pure water in equilibrium with air would have a resistance of about 10 6 ohms, known as a megohm. Ultra-pure water could achieve 18 megohms or more. Thus in the past, megohm-cm was used, sometimes ...
AFMETCAL (Air Force METrology and CALibration Program Office), located in Heath, Ohio is the primary manager of metrology services for the U.S. Air Force.It retains engineering authority for all calibrations performed in the PMEL labs throughout the Air Force, and oversees the contractor managed and operated Air Force Primary Standards Lab (AFPSL).
Electrical conductivity of water samples is used as an indicator of how salt-free, ion-free, or impurity-free the sample is; the purer the water, the lower the conductivity (the higher the resistivity). Conductivity measurements in water are often reported as specific conductance, relative to the conductivity of pure water at 25 °C.
The new sturdy HCU-6/E pallet was a drastic improvement to the older lightweight balsa wood pallets used by the Air Force in previous years. Each HCU-6/E pallet is 88 inches (220 cm) wide, 108 inches (270 cm) long, and 2 + 1 ⁄ 4 inches (5.7 cm) high. The usable space is 84 by 104 in (210 by 260 cm).
The standard is most often used as a comparative property in the specification of the conductivity of other metals. For example, the conductivity of a particular grade of titanium may be specified as 1.2 % IACS, meaning that its electrical conductivity is 1.2 % of the copper specified as the IACS standard. [2]
It is still commonly used, but has been deprecated by standards organizations, [15] [16] because of its ambiguity, as some older reports used it for the absolute permittivity ε. [ 15 ] [ 18 ] [ 19 ] The permittivity may be quoted either as a static property or as a frequency-dependent variant, in which case it is also known as the dielectric ...
The United States Air Force Stability and Control DATCOM is a collection, correlation, codification, and recording of best knowledge, opinion, and judgment in the area of aerodynamic stability and control prediction methods. [1]