Fixed Point Calibrations of Pressure Gauges

Abstract
Manganin gauges were calibrated at five fixed points, and the resulting calibration compared with that obtained at a single fixed point, or at three fixed points. For most work three points are sufficient. The nonlinearity is 0.135%/kbar. Manganin gauges intercompared agree within one bar to 10 kbar. Pressures of the H2O L‐III‐V, L‐V‐VI triple points and melting pressure of VI at 25°C were determined. It was not found possible to prepare a gold‐chromium coil which was free of hysteresis.

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