Specifications

Section 11. Programming Resource Library
11-3
11.1.4.1 Single-point Calibrations (zero or offset)
Use the following general procedure to adjust offsets (y-intercepts) with single-
point calibrations:
1) Ensure mode variable = 0 or 6 before starting.
2) Place the sensor into zeroing or offset condition
3) Set mode variable = 1 to start calibration
Mode Variable
Interpretation
> 0 and ≠ 6 calibration in progress
< 0 calibration encountered an error
2 calibration in process
6 calibration complete.
11.1.4.2 Two-point Calibrations (multiplier / gain)
Use the following general procedure to adjust multipliers (slopes) and offsets
(y-intercepts) with two-point calibrations:
Ensure mode variable = 0 or 6 before starting.
If Mode variable > 0 and ≠ 6 then calibration in progress.
If Mode variable < 0 then calibration encountered an error.
1) Place sensor into first known point condition.
2) Set Mode variable = 1 to start first part of calibration.
Mode variable = 2 during the first point calibration.
Mode variable = 3 when the first point is completed.
3) Place sensor into second known point condition.
4) Set Mode variable = 4 to start second part of calibration.
Mode variable = 5 during second point calibration.
Mode variable = 6 when calibration process completes.
11.1.5 FieldCal() Demonstration Programs
FieldCal() has the following calibration options:
Zero
Offset
Two Point Slope and Offset
Two Point Slope Only
Demonstration programs are provided as a way to become familiar with the
FieldCal() features at the test bench without actual sensors. Sensor signals are
simulated by a CR1000 excitation channel. To reset tests, go to LoggerNet |
Connect | Tools | File Control and delete .cal files, then send the demonstration
program again to the CR1000.
11.1.5.1 Zero (Option 0)
Case: A sensor measures the relative humidity of air. Multiplier is known to
be stable, but sensor offset drifts and requires regular zeroing in a desiccated