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Standard Type : Main
Document No : ISO/TR 18931:2001
Document Year : 2001
Pages : 8
Edition : 1
Section Volume : Photography (ISO/TC 42.)
humidistats in the measurement and control of relative humidity (RH) in test chambers and storage areas. Special
attention is given to situations where a photographic standard specifies controlling relative humidity to _ 2 % RH or
better.
Electric hygrometers are recommended for their precision, low cost, and accuracy when properly calibrated.
Calibration can be done either by the vendor or in-house by a dew-point measurement. Where the budget permits,
dew-point combined with ambient temperature measurements (converted to relative humidity) may be the only
sensor system.