CJ Trim

 

The CJ Trim Calibration Type is a more traditional way to calibrate the Cold Junction temperature.  To begin, note the difference between the displayed temperature (PV 1 or PV 2 value) and the sourced temperature. The difference between the two is the adjustment in corresponding CJ 1 or CJ 2 that will need to be entered.

 

  1. Select the CJ Trim Calibration Type.

  2. Select the correct input in the Inputs field.

  3. Source a temperature to that input. 

  4. Note the difference between the sourced temperature and the value in the corresponding PV 1 or PV 2 field. 

  5. Add/Subtract that value to the corresponding CJ 1 or CJ 2 value indicated at the top of the page.  For example, PV 2 is being sourced with 1000°F.  PV 2 reads 998°F and CJ 2 reads 77.95°F.  The difference between the sourced temperature and PV 2 is -2°F so we subtract 2°F to 77.95°F, which equals 75.95°F.  This value is what will be entered in step 6.

  6. Enter that new value into the Enter Target field and push the Calibrate button.  A timer will count down from 30 seconds.

  7. Once the Calibration Timer has counted down, the corresponding CJ 1 or CJ 2 value should match what was entered into the Enter Target field and the corresponding PV 1 or PV 2 value should matched the source temperature.

  8. Compare the sourced temperature with the corresponding PV 1 or PV 2 value.  Make further adjustments as-needed and perform additional calibrations.