Abstract
Problems of calibrating the instruments for measuring infrasound fluctuations in the atmosphere are considered. The influence of external conditions, including atmospheric pressure, relative humidity and air temperature, on the sound pressure reproduced in the measuring chambers of the pistonphone in the frequency range from 0.001 to 250 Hz is estimated. The errors in calculating the sound pressure in the pistonphone measuring chambers are estimated under various external conditions. Special requirements for the system for maintaining the required external conditions are given.
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