Appendix
95
B. Temperature (Humidity) Control
Temperature (and Humidity) Control
The temperature (and humidity) cabinet employs a BTHC (Balanced
Temperature [and Humidity] Control) system to control temperature (and
humidity).
The BT(H)C system balances temperature (and humidity) inside the
cabinet in order to reproduce the desired conditions. This is done by
continuously controlling the capacity of a heater of low heat load and a
humidifying heater
2
, in real-time. The central unit which controls
everything is the temperature (and humidity) controller. The
instrumentation acts as the user interface.
Instrumentation
Heater
Cooler
1
(Dehumidifier)
Humidifying
heater
2
Temperature (and
Humidity) sensor
Air
circulator
Test area
Air conditioning compartment
Electric parts
compartment
Temperature
(and
Humidity)
controller
1
Not provided on LH cabinet.
2
Not provided on LU cabinet.
Fig. B.1 Principle of BTHC system
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