SU320CSX
4110-0446, Rev. C
Page 65 of 96
© 2017 UTC
Aerospace Systems
Date Printed: 3-Jan-2017
This document does not contain any export controlled technical data.
5.15.
Thermal Commands
When the camera is powered on, the thermoelectric cooler (TEC) will immediately begin driving the FPA
to the TEC setpoint. Until the FPA reaches and stabilizes on the setpoint, the TEC is “unlocked” and the
LED will show red. Once the TEC drives the FPA temperature to the TEC setpoint, the TEC is
considered “locked” and the LED will show green. The LED may oscillate between showing red and
green for a few seconds before stable TEC lock is achieved and the LED shows solid green.
A solid red LED indicates that the camera is unable to reach or maintain TEC lock. This may be caused if
the case temperature falls outside of the acceptable range for a given TEC setpoint. These acceptable
ranges are described in Section 1.5 Thermal Management. If the case temperature is within the acceptable
range for the given TEC setpoint, try cycling power to the camera. If the LED continues to show solid
red, contact the factory for support.
5.15.1.
Get System Temperature
Description
Returns an approximation of the camera system temperature in
degrees Celsius. Optional: add Kelvin to the end of the command
for results in Kelvin. Note: SYSTEM:TEMP? is an approximation
based upon a temperature sensor on the digital board.
Setting Type
Operational
Command
SYSTEM:TEMP?
Kelvin
Parameters
none or
Kelvin
Return Values
temperature value
Range
-50.00 to +70.00 or 223.00 to 373.00 (K)
Type
signed decimal
Example
SYSTEM:TEMP?
-- query command
37.81 -- return value
310.95 Kelvin -- return value
5.15.2.
Get FPA Temperature
Description
Returns an approximation of the camera Focal Plane Array (FPA)
temperature in degrees Celsius. Optional: add Kelvin to the end of
the command for results in Kelvin. Note: FPA:TEMP? is an
approximation based upon a temperature sensor near the array.
Setting Type
N/A
Command
FPA:TEMP? -or- FPA:TEMP? Kelvin
Parameters
none
or Kelvin
Return Values
temperature
Range
-50.00 to +70.00, 223.00 to 343.00 (K)
Type
signed decimal
