Abstract
In order to calibrate highly accurate barometers, laser/ultrasonic mercury manometers have been used. However, the complexity and cost of mercury manometers have gradually taken them out of use in most calibration laboratories. As a substitute, a gas-operated pressure balance is used to calibrate precise barometers. In such a case, many commercially available pressure balances are not desirable because the consequent exposure of the piston, cylinder and masses to the atmosphere causes the problem of contamination and the ingress of dust particles to the gap between the piston and cylinder. In this paper, a novel weight-loading device for changing the masses in situ without breaking the vacuum is described. This device makes it possible to add or remove weights easily in the absolute mode, thereby greatly reducing the time between observations. Using this device we could easily calibrate a precise quartz resonance barometer (Paroscientific, Model 760-16B) from 940 hPa to 1050 hPa.
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