Teledyne Princeton Instruments Lansis, Системное руководство

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92 Lansis
®
System Manual Issue 1
EAR99 Technology Subject to Restrictions Contained on the Cover Page.
E.2.2 Camera Loses Temperature Lock
The internal temperature of the camera is too high. This might occur when the
operating environment is particularly warm or when attempting to operate at a
temperature colder than the specified limit. If this happens, an internal thermal overload
switch will disable the cooler circuits to protect them. Typically, camera operation is
restored in about ten minutes. Although the thermal overload switch will protect the
camera, users are advised to power down and correct the operating conditions that
caused the thermal overload to occur.
Additionally, repeated cycling can reduce the lifetime of the thermoelectric cooling
system.
E.2.3 Gradual Deterioration of Cooling Capability
While unlikely with the Lansis camera (guaranteed permanent vacuum for the life of the
camera), if a gradual deterioration of the cooling capability is observed, there may be a
gradual deterioration of the camera’s vacuum. This can affect temperature
performance such that it may be impossible to achieve temperature lock at the lowest
temperatures. In the kind of applications for which cooled CCD cameras are so well
suited, it is highly desirable to maintain the system’s lowest temperature performance
because lower temperatures result in lower thermal noise and better the
signal-to-noise ratio. Contact the factory to make arrangements for returning the
camera to the support facility. Refer to
Contact Information on page 100 for complete
information.
E.2.4 External Chiller: Low Coolant (Air in the Hoses)
Most circulators and/or chillers will not operate properly if there is insufficient coolant in
their tank or if excess air gets into the system. It is advised that you check the manual for
the circulator/chiller in use.