MercuryiTC
©2014 Oxford Instruments Omicron NanoScience. All rights reserved.
Page 69
The MercuryiTC auxiliary I/O daughter board is used to detect if the voltage from the
semiconductor device (typically 1.8V) is exceeded, which it will if the device warms above about
85K. This switches the state of the digital signal on input line 2 of the auxiliary I/O board which
is then used as an interlock for the heater.
The heater is locked off if the semiconductor warms up because the liquid nitrogen has run out.
This protects the cryostat system from being over-heated.
A more detailed version of this section on thermocouples is given in a technical note at
www.mymercurysupport.com
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