State system for ensuring the uniformity of measurements. Pressure gauges, vacuum pressure gauges, vacuum manometers, draught gauges, delivery head meters and draught head gauges with unified electric (current) output signals. Methods and means of verification
Acoustics. Determination of sound power levels and sound energy levels of noise sources using sound pressure. Engineering methods for small movable sources in reverberant fields. Part 1. Comparison method for a hard-wall test room
