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CricketSat LP Calibration Procedure

CricketSat LP Calibration Procedure. Mike Fortney University of Vermont. CricketSat Calibration Steps. Choose three wide ranging temperature sources (environments) Gather necessary materials Place CricketSat sensor with along calibrated thermometer into environment

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CricketSat LP Calibration Procedure

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  1. CricketSat LP Calibration Procedure Mike Fortney University of Vermont

  2. CricketSat Calibration Steps • Choose three wide ranging temperature sources (environments) • Gather necessary materials • Place CricketSat sensor with along calibrated thermometer into environment • Measure CricketSat tone burst delay interval for each temperature environment • Enter data into a spreadsheet program • Produce a conversion chart for flight use

  3. Environmental Sources • Warmest: ~ 25 C • Indoors • Outdoor shade • ~ 16 second delay • Cold: ~ 7 C • Refrigerator • ~ 21 second delay • Very Cold: ~ -15 C • Refrigerator freezer or chest freezer • ~ 36 second delay

  4. Materials • CricketSat LP temperature sensor • CricketSat receiver or UHF ham radio • Calibrated thermometer to be used as a reference • Lowest mass thermometers allow quickest stabilization and readings • Stopwatch (0.1 second resolution or better) • Usually available on digital watches • Pad of paper and pen for recording values

  5. Measure Tone Burst Delay • Turn on the CricketSat sensor and radio receiver • CricketSat receiver needs no tuning • If using ham receiver, tune around 434 MHz to find CricketSat signal • Place CricketSat sensor and thermometer into the new temperature environment • Place sensors in close proximity of each other, preferably touching. • Allow temperature to stabilize on both temperature sensing devices • Measure and record the time interval for tone bursts and the corresponding temperature • For best accuracy, measure delay in tenths of seconds or better • Perform multiple measurements at this temperature

  6. Spreadsheet Data Entry • Enter data into a spreadsheet as shown to the right • Multiple measurements can be seen for the three temperature source environments • Place the data in order of coldest source to warmest source

  7. Producing the Chart • Select the two columns of data and produce a chart • Add a trend line to best fit the data • May require a higher-order polynomial fit • Adjust the axes to maximize the data region • Print out a full page chart for field use

  8. Calibration Chart

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