Campbell Scientific CR3000 CR3000 Micrologger - Page 158

Section 7. Installation Mode Variable > 0 and ≠ 6 < 0 2 6 Interpretation calibration in progress calibration encountered an error calibration in process calibration complete. 7.8.1.4.2 Two-point Calibrations (multiplier / gain) Use this two-point calibration procedure to adjust multipliers (slopes) and offsets (y-intercepts). See Two Point Slope and Offset (Option 2) (p. 164) and Two Point Slope Only (Option 3) (p. 166) for demonstration programs: 1. Use a separate FieldCal() instruction and separate, related variables for each sensor to be calibrated. 2. Ensure mode variable = 0 or 6 before starting. a. If Mode > 0 and ≠ 6, calibration is in progress. b. If Mode < 0, calibration encountered an error. 3. Place sensor into first known point condition. 4. Set KnownVar variable to first known point. 5. Set Mode variable = 1 to start first part of calibration. a. Mode = 2 (automatic) during the first point calibration. b. Mode = 3 (automatic) when the first point is completed. 6. Place sensor into second known point condition. 7. Set KnownVar variable to second known point. 8. Set Mode = 4 to start second part of calibration. a. Mode = 5 (automatic) during second point calibration. b. Mode = 6 (automatic) when calibration is complete. 7.8.1.5 FieldCal() Demonstration Programs FieldCal() has the following calibration options: • Zero • Offset • Two-point slope and offset • Two-point slope only • Zero basis (multi-put zero) These demonstration programs are provided as an aid in becoming familiar with the FieldCal() features at a test bench without actual sensors. For the purpose of the demonstration, sensor signals are simulated by the CR3000 excitation channel. To reset tests, use the support software File Control (p. 456) menu commands to delete .cal files, and then send the demonstration program again to the CR3000. Term equivalents are as follows: 158