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October 2007
Hygrometer Calibration
E-2
The OptiSonde unit can be sent to the National Institute of Standards
and Technology (NIST) in Gaithersburg, Maryland for certification or
to any National Standards lab for calibration against their primary
humidity standards. A calibrated instrument can then be used as a
transfer standard in local laboratories to calibrate lower echelon
instruments.
Field calibration is not recommended.
Hygrometers used as calibration standards must have the following
characteristics:
•
The mirror thermometer must have suitable long-term accuracy
(such as that obtained with a platinum resistance thermometer).
Figure E-1: Chilled-Mirror Hygrometer Diagram
Caution!
Theory of Operation and Glossary
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