The CASPIR detector array is actively maintained at a
temperature of 32 
0.1 K. The dewar body must
be cold enough so that thermal emission from the camera does not rival
the electrically generated dark current. In practice, the dewar body
is cooled to 
60 K, but somewhat higher temperatures can be
tolerated without significant performance degradation.
Temperature control is through the TEMPERATURE DCL command (see §5.4). The Temperature Status Display is selected by typing:
TEMPERATURE/DISPLAY
The array operating temperature and tolerance should be set by the technical staff using the commands:
TEMPERATURE/SET_POINT=32.0 TEMPERATURE/TOLERANCE=0.1
The tolerance is the threshold level permitted before a ``Temperature-Out-Of-Range'' error is reported.
The array and camera temperatures are continuously monitored while the infrared control software is running. These temperatures are recorded on disk and can be plotted at any time to see a history of the temperature fluctuations. The interval between temperature samples should be set by the technical staff using the command:
TEMPERATURE/INTERVAL=2.0
The time value is specified in minutes.
To plot the temperature fluctuation history on the workstation screen type:
TEMPERATURE/PLOT
This uses the values of XMINIMUM, XMAXIMUM, XAUTOSCALE, YMINIMUM, YMAXIMUM, and YAUTOSCALE listed in the Temperature Status Display. These values can be changed with the corresponding TEMPERATURE command.
A hardcopy of the temperature plot can be made by typing:
TEMPERATURE/HARDCOPY
Old temperature data in the disk file can be cleared by typing:
TEMPERATURE/CLEAR
The temperature controller can be reset by typing:
TEMPERATURE/RESET