CCD Temperature vs. resistance
Created 04/21/2009 by EF
Updated 09/23/2019 by EF
How to measure the temperature of the CCD while it is being pumped
There is a connector with 5 wires coming out that connects where the
camera electronics mounts. Find the labeled DB25 connector
with 2 white, 1 black,
2 orange leads in the FAST cabinet.
Measure the resistance at the 2 white leads (there should be
2 wires with alligator clips at each end on these leads).
Follow the graph or table below.
At the start, you should measure about
20-25C, room temperature. At the end, you should reach below -90C.
Because it has no
heater controls other than a manual connection
to a DC power supply, the CCD will stabilize
by itself at at temperature somewhat below that.
Connect the Vacion once the temperature reaches below -65C.
Temperature (C) of a CCD versus
resistance (Ohm) measured with a 44001A thermistor.
See this pdf file for temperature
vs. resistance in tabular form.
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