ISO 4677-2:1985

Atmospheres for conditioning and testing — Determination of relative humidity — Part 2: Whirling psychrometer method

The method specified applies for temperatures within the range from 5 to 80 °C. The property is determined with an uncertainty not exceeding 3 % r. h. The method is restricted to wet-bulb temperatures not lower than 1 C, dry-bulb temperatures not higher than 80 °C, and pressures not differing from standard atmospheric pressure by more than 30 %.