Temperature Calibration

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Temperature Calibration

• Calibrating the Thermocouples to the Radio Shack
  temperature probe at CalDet

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Calibration

• Looking at plots of the DCS Thermocouple Probes
  temperature vs the Radio Shack probe temperature
• A line with a slope of 1 will equate to a
  perfect calibration between the Thermocouples and
  Radio Shack probe i.e. 1 degree incease in DCS
  corresponds to 1 degree increase in RS
• The data used was 11 days during the 2003
  near/far run in the T7 Hall
• The run was 21 days, but the first 8 days were
  lost due to DCS error and the last 2 due to
  peculiar temp shifts

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DCS vs RS plots insight

• A plot of DCS probe 0 vs RS over one day revels
  two things
• The Slope is not 1, which means that the DCS has
  a different temperature response
• There is a difference between cooling and heating

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12 Hour Cycle
11hr 24min Cycle
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12 Hour Cycle
11hr 24min Cycle
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Issues

• The data lacks continuity and has dips in the DCS
  that are not matched by the RS and vice versa
• Over the coolest range the data for both RS and
  DCS is non-similiar between all the days
• These anomalies are mainly due to random
  instances of activity in the CERN PS Hall
• There is a lag between values of the DCS probes
  and the RS probe, exemplified by the
  quasi-elliptical nature of the DCS vs RS plots

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Range Issues
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Fixes

• The jaunt at the top right of plot is due to a
  dip in the RS temp near its peak
• To avoid the anomalous data over the coolest
  range as well as the rounded peak over the
  warmest range an offset of 1hr was used
• Fitting over the whole cooling range will give an
  errant slope

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• Making histograms of the probe heating and
  cooling vs RS temp slopes gives 48 separate
  values of calibration, 2 for each probe
• It is obvious that the cooling and heating have
  different behaviors

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Heating/Cooling effect

• The difference between the heating slopes and
  cooling slopes is roughly 14

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Results

• The DCS vs RS slopes of heating/cooling behavior
  for each DCS probe are calculated
• The values are sitting in a textfile for anyone
  who wants them
• Is this something people would want?

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Extra

• There is a temperature lag from the open air
  thermocouples and the RS temperature
• A method of running averages has been implemented
  to examine the offset

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Pretty Decent
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Not so decent