User name V. Sulkosky
Log entry time 18:56:11 on January26,2005
Entry number 140104
keyword=Loop 1 Temperature Sensor!
17:45 While I was moving the target to 15 cm LD2, the Loop 1
temperature sensor apparently went bad. Currently it is reading
about 120 K. I paged JP, and he changed the heater control to manual
and set the HPH to adjust the remaining temperature sensors to 22 K.
I also paged Chris Keith to change the temperature sensor that the
PID feedback uses to cernox 2. Once this was done, I placed the
heater control back to PID. The target temperature is now stable at
22 K. However the temperature on the TV screen and the main GUI
still read from the main sensor, which is 120 K. From the charts of
Loop 1 in Figure 1, target operators should look at the second (green)
, fourth (blue), and fifth (purple) temperture sensors.
Target operators need to pay special attention to the Loop 1
temperature, since some of the read backs are incorrect!