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7.0 GLOSSARY
ABC:
Automatic Balance Control
– a method of maintaining accuracy in the
presence of contamination and minimizing maintenance requirements.
Analog Out A voltage or current that tracks changes in a parameter.
AT
Air Temperature
– the temperature inside the test chamber.
Depression The magnitude of available mirror cooling in the chilled mirror sensor.
Desiccant
A chemical material which removes moisture from the air sample and
thereby produces very dry air.
DP
Dew Point Temperature
– the temperature that moisture in the
air
just begins
to condense on a cooled surface.
Hold
Analog output which holds the last humidity reading just before the ABC
cycle.
Hysteresis
The tendency of a sensor to give one set of readings when going up, and
a different set of reading when going down.
Mirror
A small metallic reflective surface within the dew point sensor.
RH
Percent Relative Humidity
– the ratio between the
actual
moisture
content in the chamber and the
maximum
moisture content if the chamber
air was saturated, at a given air temperature.
RS-232
An accepted industry standard for a serial digital interface.
Saturator
A device which brings the air sample to 100% RH.
Serial Port
See RS-232.
Servolock
TM
A method of indicating that the system is locked on and tracking the dew
point.
Slew Rate
The rate of temperature change of the mirror assembly in the chilled mirror
dew point sensor.
Track
Analog output which follows (tracks) the mirror temperature during the
ABC cycle.
