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Chapter 4 System Setup 39
6.
Set the desired temperature via the Detector Temperature dialog in WinSpec. To see
when the array temperature reaches and stabilizes at the target temperature, leave the
Detector Temperature dialog open. When the target temperature is reached, the dialog
will report that the Current Temperature has
Locked .
An LNcooled array normally
reaches -100°C in under 2 hours.
NOTES:
1.
Temperature regulation does not reach its ultimate stability
for at least 30 minutes after temperature lock has been
achieved. After this period of time the desired temperature is
maintained with great precision.
2.
The
Detector Temperature
dialog will not display
temperature information while you are acquiring data.
CAUTION!
!
The pressure relief valve under the protective covering (see
Figure 4-5 ) will occasionally emit a plume of N
2
gas and mist.
Continuous
hissing indicates that the vacuum in the Dewar jacket
is probably inadequate. In this case,
first remove all LN from the
Dewar
and allow the Dewar to warm up to room temperature.
Then contact Princeton Instruments Customer Support for further
instructions. Refer to
Contact Information on page 120 for
complete information.