CR1000 Manual - Campbell Scientific

Section 7. Installation
Mode Variable
Interpretation
> 0 and ≠ 6 calibration in progress
< 0 calibration encountered an error
2 calibration in process
6 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. 159) and Two Point
Slope Only (Option 3) (p. 161) 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 CR1000 excitation channel.
To reset tests, use the support software File Control (p. 454) menu commands to
delete .cal files, and then send the demonstration program again to the CR1000.
Term equivalents are as follows:
153