Features and Capabilities 1-5
January 2006
Hygrometer Calibration The Optica 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.
Caution!
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).
• A means should be provided for viewing the dew or frost
formation on the mirror.
Figure 1-2: Chilled-Mirror Hygrometer Diagram
41.2°F
Dew Point Temperature
(Precision Thermometer)
LED
Regulation
Thermoelectric
Heat Pump Power
Gain
Optical Reference
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